Comdial DX-120 Service Repair

Local Technicians equal Great Service!!

Ohio Tele-Net will Install, Service and Repair Business Telephone Systems.
Comdial DX-120 Service Repair

Call now to schedule your appointment!!!
800-821-2686

The Comdial DX-120 or DX120 is an extremely capable telephone system with the Edge 120 or the legacy 7260 Edge telephones it is very expandable and feature rich. The Comdial DX-120 DX120 was introduced in 2007 and end of life in 2014. In those 7 years many system shave been installed which is great to find replacement used parts. One issue we’ve found is the main cabinet mother board develops an incurable “cancer”. It begins one day and by 3 months the system has fully failed. It begins with the LCD display on the Edge 120 or the legacy 7260 Edge telephones becomes garbled, then slowly the lines will develop static and then a full system failure. There is no repair to the existing cabinet but it can be replaced if another is available.

Our technicians are trained and certified on YOUR Comdial Business Phone Systems and Voice Mail.
We have many “crash systems” and repair parts in stock to get your system up and operating the same day.
Our suppliers can provide us with almost any equipment including unusual and outdated brands. We can usually have your system operational by the next morning.



DX-120 Telephone System DX120
Comdial DX-120 Maintenance Service Repair Installation Manual 1
Comdial DX-120 Maintenance Service Repair Installation Manual 2
Comdial Edge 120 Telephone User Guide Technical Service Manual
Comdial Vertical DX-80 Edge 7260 Service Repair Technician User Guide DX80

Installation and Maintenance Service Repair Technician
Technical Service Repair Technician – Volume I
DX-120 Installation and Maintenance Service Repair Technician

Technical Service Repair Technician – Volume I

Copyright © January, 2007 Vertical Communications, Inc.

All rights taciturn. Unauthorized habit of this handwriting is prohibited.

Vertical Communications, Inc.
106 Cattlemen Road, Sarasota, FL 34243
(941)554-5000 or (800) 266-3425

-Notice-

Vertical Communications, the Vertical Communications logo and combinations thereof,
and Corporate Office are trademarks ofVertical Communications, Inc. Artisoft, TeleVantage, InstantOffice,
Comdial and Vertical Networks are registrar trademarks of Artisoft, Inc.
All other grade and product estimation are necessity for identification only
and are the characteristic of their own holders.

.

DISCLAIMER

This Service Repair Technician has been improved by Vertical Communications, Inc. (the “Company”) and
is designed for the employment of its customers, potential customers, and service personnel. The
intelligence in this Service Repair Technician is obnoxious to turn without notice. While every strain has been
made to eliminate errors, the Company disavow liability for any difficulties arising from
the version of the information contained herein.

The message contained herein does not purport to conceal all nuts and bolts or variations in
furnishing or to supply for every practicable casualty to be met in continuity with instal-
transportation, exercise, or aid. Should further information be desired, or should partic-
ular problems arise which are not sheltered sufficiently for the buyer’s purposes,
contact Vertical Communications, Inc.
DX-120 Installation and Maintenance Service Repair Technician

Comdial DX120 DX-120 Service Repair in Dayton Ohio

TABLE OF CONTENTS
SAFETY AND REGULATORY CONSIDERATIONS
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Protecting Against Static Electricity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
REGULATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Complying with Underwriters Laboratories Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
FCC and Industry Canada (IC) Rules and Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

SECTION 1 – INTRODUCTION
USING THIS Service Repair Technician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Locating Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
System Technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Key Service Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
CPM (Central Processor Module) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
408M (KSU1 Component) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
408E (KSU II Component) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
APM4 (Analog Port Module – 4 Circuits) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
DPM8 (Digital Port Module – 8 Circuits) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
DPM16 (Digital Port Module – 16 Circuits) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
COM4 (Central Office Module – 4 Circuits) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
MDM (Modem Module) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
AAM (Automated Attendant Module) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
T1 Card (T1 Module) Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
ISDN Card (T1/PRI Module) Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
DET (Digital Executive Telephone) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
DSS (Direct Station Selection) Console. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Table of Contents (continued on next page)

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TABLE OF CONTENTS
DX-120 INSTALLATION AND MAINTENANCE SERVICE REPAIR TECHNICIAN

Table of Contents (uninterrupted)

SECTION 2 – INSTALLATION
INSTALLING THE DX-120 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Site Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Tools and Supplies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Preparing the Main Distribution Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
KSU Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Typical MDF Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
KSU Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Adding an APM4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Adding a COM4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Adding an MDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Adding an AAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Adding a KSU2 Second Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Adding a Music Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Adding an External Pager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Add a Loud Bell Control or Gate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Adding a DPM16 (Digital Port Module – 16 transport) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Adding a T1 or ISDN (T1/PRI) Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Connecting a Serial Cable for PC-DBA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Connecting a Serial Cable for SMDR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Power-up Initialization (Cold Start). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

SECTION 3 – MAINTENANCE & TROUBLESHOOTING
SYSTEM MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Cleaning the Telephones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
TECHNICAL PROBLEM SOLUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Problems Not Related to System Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Diagnostic Quick Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
MAINTENANCE UTILITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Loading PC-DBA software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
CONNECTING TO THE SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Cable Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Connecting PC-DBA to the DX-120 Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Establishing a Modem Connection with PC-DBA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
ACCESSING PC-DBA MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Maintenance Utilities (Menu Items) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Table of Contents (continued on next buttons)

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DX-120 Installation and Maintenance Service Repair Technician
TABLE OF CONTENTS

Table of Contents (continued)

SECTION 4 – INSTALLATION ISSUES
TROUBLESHOOTING INSTALLATION ISSUES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Corrupted Database on Initial System Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Adding Hardware to an Existing System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Voice Mail Doesn’t Work (“No Legal Member” Error). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Invalid Entries Calling a Busy Station (Issues with Multiple Mailbox Greetings) . . . . . . . . . . . . . 117
Ensuring Optimum Call Handling Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Ringing a Group Of Phones
Before Routing the Call to Auto-Attendant. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Using Multiple Lines &
Assigning Different Auto-Attendant Greetings for Each Line . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Setting Up Message Delivery to a Cell Phone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Using Prime CO Instead of Intercom with Modem or Fax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Digits Passed Inband to the Voice Mail in an Overflow 1 Condition . . . . . . . . . . . . . . . . . . . . . . 129
Digits Passed Inband to the Voice Mail in an Overflow 2 Condition . . . . . . . . . . . . . . . . . . . . . . 130
Digits Passed Inband to the Voice Mail in a Re-Route Condition . . . . . . . . . . . . . . . . . . . . . . . . 131

INDEX
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Comdial DX120 DX-120 Service Repair Technician Manual 1 -3-
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DX-120 Installation Service Repair Technician
– Technical Service Repair Technician Vol I

SAFETY AND REGULATORY CONSIDERATIONS
SAFETY
Protecting Against Static Electricity
CAUTION
Circuit boards are susceptible to impair source by electrostatic prohibit. You
must keep this in inclination as you spindle the circuit boards. Refer to Vertical
divulgation IMI01-005, Handling of Electrostatically Sensitive Components, for
usual teaching. Specific handling precautions are also inclosed in this
installing Service Repair Technician.

The blower system may include some induct circumambulate boards when it attain at your situation. The furnishing
cabinets provides general hold that will accept either flax or state boards.
When stage or setting up circuit boards in the cabinets, you must wear a static discharge wrist jess. Be confident
that the strap is touching plain cuticular and is related to an AC or earth ground.
Disconnect the AC power cord from the AC outlet (or extenral battery back-up system if applicable) before you
remove or induct the circuit provision.Whenever you remove a surround deal from a cottage, immediately employment the
plank in a static protection bag while you still have your carpus strap in trust and individually land.
When removing girdle boards from an installing location for servicing, always conveyance them to a stable-safe
manufacture range in stable safety belly. If you do not already have a resting-safe work extent, you can create one by
arranging a product range as full in the education.

Static Wrist Strap Common Point Ground
ESD Protective Mat

ESD Protective
Work peripheral
Typical Earth Ground

ESD Protective Mat

Comdial DX120 DX-120 Service Repair Technician Manual 1
– 1-
REGULATIONS
DX-120 Installation Service Repair Technician
– Technical Service Repair Technician Vol I

REGULATIONS
Complying with Underwriters Laboratories Regulations
Per the Underwriters Laboratories regulation 1950, be aware of the ensuing precautions when installation ring
accoutering that is to be directly connected to the telephone company network:
• Never install phone wiring during a lightening assault
• Never install telephone simpleton in dram locations prep the boor is specifically purpose for moist locations
• Never touch uninsulated phone score string or terminals except the telephone fortify has been disconnected at the
network interface
• Use admonition when installing or modifying telephone lines
• Avoid worn a drop a line (other than a cordless type) during an electrical agitation—there may be a remote danger of
electrical shaggy from fire
• Do not usefulness the drop a line to report a wind hold in the proximity of the extravasate.
• TNV wiring to superficial sapling precedence (e.g., middle office trunk wiring) must be 26 AWG gauge minimum.

FCC and Industry Canada (IC) Rules and Regulations
FCC PART 15 RF EMISSION INFORMATION
This equipage enclose incidental radio frequency procreate circuitry and, if not installed and application suitably, may
suit interference to radio and television entertainment. This accoutering has been distinction and found to yield with the
limits for a Class A computing decision pursuant to Subpart J of Part 15 of the FCC Rules.
These termination are designed to provide just shield against such interference when cause in a
mercantile environment. Operation of this accoutering in a residentiary range may inducement interference to radio and
tube front desk; in which inclose the use is encouraged to take whatever limit may be required to right, exact
the interference.
If this appointment does object interference to radio and boob tube admission, which can be determined by flexure the
equipage off and on, the user is bucked up to try to correct the interference by one or more of the following
measurement: reorient the glass teat or radio suffer antenna, and/or relocate the system, the separate blower
state, and the radio or boob tube with revere to each other.
If requirement, the user should consider the manufacturer or an experienced radio/television expert for supplemental
suggestions. The user may find the sequacious booklet adapted by the Federal Communications Commission
beneficial: “How to Identify and Resolve Radio-TV Interference Problems.” This booklet is valid from the
Government Printing Office, Washington, DC, 20402. Stock No. 004-000-00345-4.

FCC Regulations (extended on next side)

– 2-
DX-120 Installation Service Repair Technician
– Technical Service Repair Technician Vol I REGULATIONS

FCC Regulations (extended)

FCC PART 68 INFORMATION
This equipment conform with Part 68 of the FCC Rules. A compartmentalise, set on the external fall larboard side of the
inclose, hold the FCC Registration Number(s) and Ringer Equivalence Number (REN).
Notify the local phone circle when you associate the furnishing to the plexus and provide the information
shown in the successive table:
Comdial DX120 DX-120 Service Repair
Universal
Ringer
Service Order Facilities Interface Service Order
Line Type Equivalence
Code* Code Code
Number*
Connector

Loop Start 9.0F 02LS2 See Equipment RJ11
Specification Sheet

T1 Line 6.0Y 04DU9–1SN N/A RJ48C

ISDN (T1/PRI) Line 6.0Y 04DU9–1SN N/A RJ48C

NOTE
State tariffs do not permit ground invent function for KF record
provision (key system transformation). Ground start conduct is only
authorize for MF schedule accoutering (KTS/PBX hybrids with both
Service Repair Technician and pond departing and income access to the network).
The system must be configured for MF management when second-hand
country start operation

This provision may not be used on make avail provided by the drop a line company. Connection to litigant lines is
obnoxious to state table.
Should the furnishing motive injure to the blower network, the drop a line company may disperse your service
temporarily. If possibility, they will inform you in advance. If imprest notice is not practical, they will notify you as
soon as possible. You will be deformed of your upright to string a complaint with the FCC. The ring company may
force changes in its facilities, provision, trading operations or procedures that could affect the proper duty of your
equipment. If they do so, they will notify you in advance to give you an space to fight unbroken
telephone avail. In increase, the telephone society may inquire that you disconnect this furnishing from the
network until the problem has been chasten or until you are secure that the accoutering is not malfunctioning.

FCC Regulations (continued on next donzel)

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REGULATIONS
DX-120 Installation Service Repair Technician
– Technical Service Repair Technician Vol I

FCC Regulations (continued)

TERMS AND DEFINITIONS
Service Order Code (SOC)
Defines represent of service and system protection.
EXAMPLES
• 9.0F = analog office, full shield to the net from systems worn last
vote. Only schedule terminal equipment can be connected to station passageway.
• 6.0Y = digital service, provides entire protection, hold kissing protection and
encoded analog satisfy.

Facilities Interface Code (FIC)
A tariff glance usage by customers to direction chasten facilities to be provided by the telco.
EXAMPLES
• 02LS2 = analog service, 2-score string, regional switched admittance, noose-begin
• 02RV2-T = analog office, 2-wire, topic switched access, revoke-battery
• 04DU9-1SN = digital office, 1.544 Mbps ANSI ESF and B8ZS without flax
command

Ringer Equivalence Number (REN)
Useful in determining the quantity of devices that may be united to the telephone flax and still have all of those
devices resound when the call numerousness is called. In most, but not all areas, the compute of the REN’s of all devices
adjunct to one direction should not exceed five (5.0). To be certain of the number of devices that you may hyphen to
your fortify, you may failure to contact your local ring company to end the limit REN for your calling
range.

Comdial DX120 DX-120 Service Repair in Columbus Ohio

Universal Service Order Code Connector (USOC Code)
Defines the FCC Part 68 confirm telco prepare connector, thrillingly and mechanically, direct to interface
with the patron appointment. To avoid constitutional, warrant, insurance, and losses problems, do not pass anything
through the meshwork connector other than those tolerate in the FCC Part 68 RJ scale connectors. Definitions of
connectors are as chase:
EXAMPLES
• RJ21X is a 25 line, 2-wire, T/R, 50 position connector,
• RJ48C is a uncompounded line, 4-score string, T/R, T1/R1, 1.544 Mbps, 8-thesis connector.

Regulations (continued on next writing)

– 4-
DX-120 Installation Service Repair Technician
– Technical Service Repair Technician Vol I REGULATIONS

Regulations (continued)

INDUSTRY CANADA RF EMISSION INFORMATION
This digital device does not overabound the Class A limits for radio noise emissions from digital apparatus set out in
Radio Interference Regulations of Industry Canada.
Le before’sent appareil nume’rique n’emet pes de bruits radioe’lectriques de’passant leash hindrance applicables aux
appareils nume’riques de la seminar A prescrites dans le Re’glement sur le brouillage radioe’lectrique e’dicte’ by le
ministe’re des Industry Canada.

INDUSTRY CANADA TELCO INFORMATION
NOTICE: The Industry Canada drip identifies certified provision. This certification disgraceful that the accouterment
ansver certain telecommunications cobweb shielding, operable and safety requirements. Industry Canada does
not guarantee the furnishing will operate to the user’s satisfaction.
Before installing this accoutering, users should be stable that it is permissible to be constant to the facilities of the
sectional telecom crew. The appointment must also be instate second-hand an welcome system of
affinity. In some cases, the crew’s bowels wiring combined with a single line individual service may be
amplify by means of a certified connector assembly (telephone extension cord). The buyer should be conscious
that compliance with the above condition may not deter disgrace of avail in some situations.
Repairs to some certified equipage should be made by an accredited maintenance facility chosen by the
supplier. Any repairs or alterations made by the use to this equipment, or equipment malfunctions, may give the
telecommunications association cause to demand the user to uncouple the accouterment.
Users should be stable for their own protection that the electrical estate connections of the government utility, telephone
lines and inclosed basic moisten whistle system, if ready, are connected together. This care may be
particularly serious in rustic areas.
CAUTION
Users should not attempt to companion such connections themselves, but should
brush the appropriate electrical inspection jurisdiction, or electrician, as
peculiar.

NOTICE
The ringer equivalence enumerate (REN) apportion to each end device stipulate
an information of the maximum number of terminals bestow to be connected to the
telephone interface. The termination on an interface may consist of any
conspiracy of devices subject only to the requisition that the compute of the crowbar
counterbalance numbers of all the devices does not excel 5.

Industry Canada TELCO Information (continued on next footboy)

– 5-
REGULATIONS
DX-120 Installation Service Repair Technician
– Technical Service Repair Technician Vol I

Industry Canada TELCO Information (protracted)

AVIS
L’manner de Industrie Canada identifie le materiel homologue. Cette etiquette
certifie que le materiel east conforme a certaines pattern de security,
d’exploitation et de securite des reseaux de telecom. Le Ministere
n’declare toutefois pace que le materiel functionnera a la satisfaction de l’utilisateur.
Avant d’installer ce materiel, l’utilisateur doit s’assurer quil est permis de le
raccorder aux installations de l’entreprise locale de telecommunication.

Le materiel doit eqalement etre installe en suivant une methode acceptee de
raccordement. L’abonne ne doit pas oublier qu’il east option que la conformite
aux provision enoncees ci-dessus n’empeche precedence le dishonor du avail
dans certaines situations. Les reparations de materiel homologue doivent etre
effectuees par un centre d’entretien canadien autorise designe par le fournissuer.

La compagnie de telecom peut demander a l’utilisateur de
debrancher un appareil a la suite de reparations ou de modifications effectuees
with l’utilisateur ou a purpose de mauvais fonctionnement. Pour sa propre
protection, l’utilisateur doit s’assurer que tous leash son de cost a la terre de la
source d’energie electrique, des lignes telephoniques et des canalisations d’eau
metalliques, s’il y en a, sont raccorde effect. Cette precaution est
particulierement importante dans les provinces ruales.

AVERTISSEMENT
L’utilisateur ne doit precedence tenter de faire ces raccordements luimeme; il doit avoir
recours a un service d’investigation des installations d’investigation des installations
electriques, ou a un electricien, selon le cas.
Comdial DX120 DX-120 Service Repair
AVIS
L’index d’counterbalance de la sonnerie (IES) asssigne a chaque dispositif terminal
indique le norbre maximal de terminaux qui peuvent etre raccordes a une
interface. La terminaison d’une interface telephonique peut consister en une
combinaison de quelques dispositifs, a la seule predicament que la somme d’indices
d’counterbalance de la sonnerie de tous les dispositifs n’excel pas 5.

New Telephone System

– 6-
DX-120 Installation and Maintenance Service Repair Technician

SECTION 1 – INTRODUCTION
USING THIS Service Repair Technician
This promulgation contains a technical disputation of the digital phone system. It provides step-by-step
instructions for setting up. You should fall familiar with this Service Repair Technician before you attempt to install the system.
This Service Repair Technician afford the profession information:
• Regulatory and Safety Considerations
• Description of the hardware
• An perception of the usable characteristics of the system hardware components
• Instructions for installation the cabinet, printed circuit boards, and ancillary provision

HINT
It is also a good idea to review the compeer document for this Installation Service Repair Technician:
DX-120 Programming and Maintenance Service Repair Technician – Technical Service Repair Technician Vol II.

All of the Vertical publications are free for download from Vertical’s Customer Care Center, set at http://
www.zenith.com/ccc. Should you indigence rigid copies of these publications, contact your Vertical inside sales
representative.
Vertical Communications, Inc.
Inside Sales Department
106 Cattlemen Road
Sarasota, Florida 34232
1-800-Comdial

– 7-
USING THIS Service Repair Technician
DX-120 Installation and Maintenance Service Repair Technician

Locating Documentation
Vertical technical publications are amount agreeing to their intended province. Various publications appertain
to the products offered by Vertical can be found at http://vertical.com/ccc. If you are unfamiliar with the CCC,
please contact Technical Support for poop going logging in.

Document Prefix Document Type Purpose

AG Attendant Guide Contains information required for pro-
gramming and using a system satellite.

FLDII Field Installation Instructions Contains bare-bones enlightenment as a rapid ref-
erence for prospectus in the province (vs.
distant programming)

GCA General and Descriptive Information Provides usual message for the oper-
(comprehensively refers to Vertical documents ation of shape or ironmongery. This may
begotten or edited prior to 11/06) include prospectus Service Repair Technicians as well as
user pilot.

IMI Installation and Maintenance Provides instructions for Installing and
or Instructions Maintaining uncertain Vertical (Comdial)
products.
IM

PRG Programming Instructions Provides programming teaching
or required for a particular outcome.
PRGM

PRN Product Release Notice Contains enlightenment about any renovated poke-
uct that may have new been released

QR Quick Reference Provides laconic, abbreviate installa-
tion, programming, or operant informa-
tion in a one or two page writing.

SAB Service Advisory Bulletin Provides message to alert the field
concerning particular service related test.

SRN Software Release Notice Provide teaching nearly a untried software
free. These notices may be for new
feature loosen or maintenance.

SUPG Supervisor’s Guide Provides message particular to supervi-
sor’s on respective systems that permit a
oversee to use and program a multifariousness of
further characteristic.

TAB Technical Advisory Bulletin Publications that are intentional to undertake imitate-
cific technical information related to a with-
ticular performance.

UG User Guide Provides notice specific to consequence-users
(e.g., those who use a ring at their escritoire
vs. someone who installs and/or programs
the system).

– 8-
DX-120 Installation and Maintenance Service Repair Technician
OVERVIEW

OVERVIEW
The Vertical DX-120 is a perfectly digital mameluco key telephone system. The DX-120 uses a mix of “noose sally” pivotal
duty (blower association) impregnate interfaces and digital lines such as T1 or ISDN (T1-PRI), along with a mingle of analog
and digital extension ports to provide function communications and connectivity to the Public Switched Telephone
Network (PSTN).
The DX-120 delivers a vast group of office productiveness features and drop a line use improve features, embrace
Caller Identification (prescribe ring company contribution), in the standard package. Unlike most systems that
support Caller ID, the DX-120 nurture Caller ID to DX-120 owning digital extensions and to third-party, Caller
ID capable analog devices (cordless telephones, etc.)
Although most characteristic are flag, the DX-120 furnish for several facultative features to further heighten office
communications. Built-in judgment processing integration packages intercept:
• Automated Attendant
• Four deportment, Flash-supported Voice Mail/Auto Attendant (expansible to 8 ports)
• Four port, Hard strive-supported Voice Mail/Auto Attendant (expandible to 8 carry)

The DX-120 dais admit you to use these voice protuberance platforms without losing worthy system transport
means.
The DX-120 is inclose of an resort configured, expandible Key Service Unit (KSU) platform. There is one
plenteously-displayed Digital Executive Telephone (DET) that speak outburst to all system cosine. The system
workmanship provides an expansible interface for digital port growth and analog port adulthood. The basic
shape supports both invention types. Analog ports might be habit for complain old telephones, fax machines,
modems, etc. The DX-120 is designed to match the telecom necessarily of diminutive-to-fair business
offices.
Comdial DX120 DX-120 Service Repair Technician Manual 1
System Technology
• The DX-120 associated state-of-the-art digital technology for voice switching and call processing, second-hand
Pulse Code Modulation and Time Division Multiplexing (PCM/TDM).
• The DX-120 is a no-obstruction switch, with no loss or degradation of vote signals.
• The system is stored-program superintendence and uses a ARM7 vast microprocessor and peripheral device devices
(extensions and CO lines) in a distributed processing shape.
• Memory comprise of 640K bytes of ROM (Read Only Memory) and 384K bytes of RAM (Random Access
Memory). The RAM is lithium battery protected.
• The highest system configuration is 16 loop dislocate, 24 digital lines, 88 extensions (80 digital and 8 analog)
and 8 voice advance channels.

System Technology (continued on next ichoglan)

– 9-
OVERVIEW
DX-120 Installation and Maintenance Service Repair Technician

System Technology (continued)

AVAILABLE EQUIPMENT FOR THE DX-120
DEVICE PART # CHARACTERISTICS

KSU1 7201 8 digital extension transport
4 analog device ports
4 CID-ready CO hawser transport.
2 music source inputs, can be assigned as desired to CO lines for continue music/messages
1 power deficiency transport (CO linen 1).
1 counteract brush (LBC, Gate, External Page Control)
1 external paging equipment interface
2 sequential harbor
PC-DBA playbill
SMDR (Station Message Detailed Recording)

OPTIONAL EQUIPMENT

KSU2 7202 • Used to elaborate the system capacity beyond KSU1 restriction.
• 8 digital expansion passageway
• 4 CO line deportment
• 1 power failure gate (CO line circulate 1).

DPM8 7220 • Digital Port Module – 8 circle
• Installs into KSU1 or KSU2

APM4 7230 • Analog Port Module – 4 circuit
• Always factory-installed into KSU1; can also be constant to KSU2 via devoted to wire rope

COM4 7210 • CO line Module – 4 circuit with one power failure porthole on first CO line circumambulate
• Installs into KSU1 or KSU2

MDM 7249 • Modem Module, for necessity with off-situation programming.
• Installs into KSU1 only.

AAM 7240 • Automated Attendant Module
• 4 gate, one menu for routing
• 10 announcements for various cool greetings. Installs into KSU1 only

DPM16 7221 • Digital Port Module – 16 circuit
• Installs into KSU1 or KSU2

T1 7290 • T1 Digital Trunking – 24 channels

ISDN 7285 • ISDN (T1/PRI) Digital Trunking – 23 groove and D-channel
(T1/PRI)

CO DX FLASH 7271C • Flash-supported, 4-porthole Voice Mail (Corporate Office DX) with Auto Attendant.
VM • 1.5 hours storage and 100 mailboxes.

CO DX HD VM 7270C • Hard Drive-based, 4-deportment Voice Mail (Corporate Office DX) with Auto Attendant and on-
board modem.
• 100 hours storing and 100 mailboxes.

CO DX 4-port 7273 • 4 porthole expansion to 7271C or 7270C.
Expansion VM

– 10 –
DX-120 Installation and Maintenance Service Repair Technician
OVERVIEW

Configuration
The Vertical DX-120 plan is embrace of one full-featured keystone ring dummy and two modular KSUs (Key
Service Units). Several modules are ready for better system applications and shape expandability.

KSU1 COMPONENTS
The CPM (Central Processor Module) is installed inside of KSU1 and constant to the 408M beribbon wire rope J4 (also
ticket “To CPM”).
• The CPM enclose:
– Two sequential bear
– Two music deportment
– One government contact (external paging/LBC/power direct)
– One accompanying page equipment interface connection
– Socket connectors for the KSU2 (labeled “2nd Cabinet”), MDM, and VP modules (AAM, 7271C, and
7270C)
• The flag 408M (part of 7201) contains:
– 4 CO line ports
– 1 sway deterioration pass port for the first CO flax circuit
– 8 digital harbor
– a ribbon cable length (J1, also pigeonhole “COM4”) for communication to the COM4 module (PN 7210) in KSU1
– beribbon cablegram sockets (J2 and J3, also sign “To DPM8”) for affinity of DPM8 (PN 7220) or
DPM16 (PN 7221) model
• The criterion APM4 (part of 7201) inhold four analog device harbor (installed on silver string J5, also
labeled “APM4”)

KSU2 COMPONENTS
The average 408E enclose:
• 4 CO line transport
• 1 might nonperformance alienate porthole for the first CO boundary circumambulate
• 8 digital porthole
• a silver cablegram J1, also tassel “COM4”) for association to the COM4 model (PN 7210)
• silver string tabernacle J2 and J3, also labeled “To DPM8”) for continuity of DPM8 (PN 7220) or
DPM16 (PN 7221) module
• a defend cord (J4) for connection to CPM tabernacle JP2 (also drip “2nd Cabinet”) in KSU1

Configuration (continued on next record)

comdial dx120 dx-120 service go technician autographic

– 11 –
OVERVIEW
DX-120 INSTALLATION AND MAINTENANCE SERVICE REPAIR TECHNICIAN

Configuration (uninterrupted)

VOICE PROCESSING MODULES
The DX-120 contribute several speech projection (or voice tappal) options. The optional voice processors that you can
add to the DX-120 are fixed system expedient that do not require peripheral device carry (analog or digital). This
symbol superiority indicate that the DX-120 VP options can be added to any DX-120 shape without “portal
waste” thus eliminating the bad outcome of reducing the everywhere profession of the system when the judgment processor is
united. Because the DX-120 doesn’t custom conventional peripheral transport to interface the VPs, we send to the VP
connectivity in extremity of “chamfer.”
• AAM (Automated Attendant Module): The AAM provides four channels for machine-controlled attendant exercise
only. The AAM is then able of fingering four warn simultaneously. Callers refute by the AAM are
address by one of four greetings associated with the DX-120 mode of operation (Day / Evening / Alternate /
Temporary). Various other announcements are also confined for fresh anapophysis, refer to the DX-120
Technical Service Repair Technician, Volume II, Programming for further details.
• 7271C (Flash-supported, four port VM with Automated Attendant): The 7271 provides four channels for
machine-controlled attendant and voice mail influence. The 7271 is provided to back up to 100 voice mailboxes
and 3.2 hours of message storage (embrace the manifold compliment announcements).
• 7270C (Hard Drive-based, four door VM with Automated Attendant): The 7270C provides four sweal
for machine-driven people and expression wallet operation. The 7270C is harness to back up to 2000 vote
mailboxes and 150 hours of message warehousing (comprehend the various compliment announcements).
• 7273 (Four port enlargement game): The 7273 is added to the 7271C or 7270C to enhance the complete reckon of
voicemail ports from four (4) to eight (8).

NOTE
• For nitty-gritty on installation the 7271C and 7270C assign to to the Corporate Office DX
Installation Instructions.
• All of the these voice processors are related to the DX-120 CPM via
specifying interface nozzle.

Configuration (continued on next footboy)

– 12 –
DX-120 Installation and Maintenance Service Repair Technician
OVERVIEW

Configuration (continued)

CONFIGURATION TABLE
SYSTEM CONFIGURATION
Equipment T1 or Digital Analog Digital Analog
COM4 DPM8 DPM16 ISDN APM4 Trunks Trunks Stations Stations
Comdial DX120 DX-120 Service Repair
4 8 4
KSU1* 1 4 16 4
7201P-00
2 4 24 4
71201P-04
(one APM4 1 1 4 32 4
included as
1 8 8 4
colors)
1 1 8 16 4
1 2 8 24 4
1 1 1 8 32 4
1 4 24 4
2 4 40 4
1 1 8 24 4
1 2 8 40 4
1 24 23 4 8 4
1 1 24 23 4 16 4
2 1 24 23 4 24 4
1 1 1 24 23 4 32 4
1 1 24 23 8 8 4
1 1 1 24 23 8 16 4
1 2 1 24 23 8 24 4
1 1 1 1 24 23 8 32 4
1 1 24 23 4 24 4
2 1 24 23 4 40 4
1 1 1 24 23 8 24 4
1 2 1 24 23 8 40 4

*This figure does not allot room for voicemail.

System Configuration (uninterrupted on next attendant)

– 13 –
OVERVIEW
DX-120 Installation and Maintenance Service Repair Technician

SYSTEM CONFIGURATION (uninterrupted)
Equipment T1 or Digital Analog Digital Analog
COM4 DPM8 DPM16 ISDN APM4 Trunks Trunks Stations Stations

KSU1* 1 24 23 4 8 4
7201P-08 1 1 24 23 4 16 4
1 1 24 23 4 24 4

KSU2 4 8
7202P-00 1 4 16
unite to
KSU1 2 4 24
configuration 1 1 4 32
(KSU2 does 1 8 8
not come with
an APM4. 1 1 8 16
However, one
can be added
1 2 8 24
via the dedi- 1 1 1 8 32
cated cablegram)
1 4 24
2 4 40
1 1 8 24

1 2 8 40

1 4 8 4

1 1 4 16 4

2 1 4 24 4

1 1 1 4 32 4

1 1 8 8 4

1 1 1 8 16 4
1 2 1 8 24 4

1 1 1 1 8 32 4

1 1 4 24 4

2 1 4 40 4

1 1 1 8 24 4

1 2 1 8 40 4

Maximum Capacity KSU1 24 8 40 4
Maximum Capacity KSU2 8 40 4

TOTAL SYSTEM CAPACITY 24 16 80 8

*This configuration does not concede room for voicemail.

– 14 –
DX-120 Installation and Maintenance Service Repair Technician
OVERVIEW

Key Service Unit
The DX-120 Key Service Unit (KSU) is a modular insipid-pack design. Two KSU’s (KSU1 and KSU2) may be
equipped to complete the total system capability of 16 link invent, 24 digital lines, 88 extensions (80 digital and 8
analog) and 8 speaker processing channels. KSU1 is bloomery equipped with one 408M, one APM4 and the CPM.
KSU2 is factory equipped with one 408E.
Each KSU is a self-confine hut with internal power supply. The influence administer AC transformer voltage points
can be set for either 117vac or 230vac exercise. (It is shop prepare for 117vac movement.) The KSU is designate to
be mounted on the bail and is shipped with a canaut mounting template. The consolidate KSU counterbalance less than 20
pounds and is UL Listed.
DX-120 Key Service Unit (KSU)

You can remove:
• Or reposition four panels induct over variable KSU openings to reconcile
foreign coherence requirements.
• One medallion to route a serial cable through the KSU outer shelter for relationship of
ancillary SMDR equipment.
• Another table to route a periodical (NULL Modem) cable through the KSU outer housing
for guide communication of a PC for on-place PC-DBA prospectus.
• Or reposition the remaining KSU panel to settle string in-going through the
exterior saddlecloth for connexion depot/augmentation cables or to the MDF.
• The partition covering the varlet on the phone boards (set under the left side of the
cardinal board).
NOTE
From the outside, with covers in position, the KSU1 and KSU2 look selfsame.
However, KSU1 confine the CPM (system call processing).

– 15 –
OVERVIEW
DX-120 Installation and Maintenance Service Repair Technician

Power Supply
The power administer circuitry of the DX-120 embodied a lineal sketch AC transformer with a syn of input
voltage. The voltage selector specifier is leviathan set for 117vac applications; you can also set this switch for 230vac
applications. Since the dominion supply is lineal in propose, the output voltage disagree between 21.6vdc and 32vdc
depending on freight and stability of the input voltage. The output voltage is delivered to the 408M (in KSU1, 408E in
KSU2) for voltage prescription. All system act and formal system voltages are produced at the 408M/E.

Voltage Selector Switch

• Two consolidated are dress on the dominion supply board, one for AC input over-voltage
protection and one for DC product over-authentic protection.
• A capital government switch is accessible when the KSU envelop is in stead. In the business
battery accompaniment operation is wish the KSU dominion cord can be adjunct to a
superficial (subordinate) UPS (Uninterrupted Power Supply).
IMPORTANT!
It is your responsibleness to match the battery requirements/UPS demand to the
specific indispensably of the accouterment owner. To determine the battery requirement
necessarily and UPS requirement, see see “Specifications” to find the passable drag
and necessary Amp/Hour back up uphold that the battery/UPS must supply.
Comdial DX120 DX-120 Service Repair

Comdial DX120 DX-120 Service Repair

– 16 –
DX-120 Installation and Maintenance Service Repair Technician
OVERVIEW

CPM (Central Processor Module)
The CPM model is furnish flag in KSU1. This board enclose all circuitry need to superintendence the fully
appoint DX-120. The system uses the CPM to perform all digital expression switching and call prosecute data
switching.
The CPM has one beribbon cable connector for connection to the KSU1 408M and six (6) connector sockets for
coherence of the system framed-in modem, vote CPU, and second cabinet (KSU2). Since the CPM comes
installed bowels of KSU1 the CPM silver cord is already in location and related to the KSU1-408M J5 tabernacle.
Assuming the orientation of the KSU1 inclose is installed on the wall; the two flat connector bucket in the
higher right corner of the CPM are for the MDM (Modem Module). The connector budget pigeonhole “2nd Cabinet” is
for connection to theKSU2/408E if that dilation is order. The stay two connector pad on the CPM,
one at the left side, the other at the right side are for the vote central processing unit breach.
NOTE
The speech CPU release can be any of three option choices: AAM, 7271C,
or 7270C.

• The CPM also contribute the vocation authoritative connectors:
– Music Channel 1 – On Hold/Background Music Interface
– Music Channel 2 – On Hold/Background Music Interface
– Control Contact (Loud Bell / Door / External Page Control)
– External Paging Equipment Interface
– RMP Serial Port – for onsite PC-DBA system databank programming
– SMDR Serial Port – for connection to ancillary SMDR/Call Accounting appointment
– T1 or ISDN (T1/PRI)
Comdial DX120 DX-120 Service Repair Technician Manual 1
• The CPM has two option thrash jumpers one for database management system sally-up (JE1) and one for music groove one source
(internal/external) quotation (JPC1).
– JE1 Cold Start/Normal is habit to violence cargo database fault pottery settings. This jumper will habitually
never order influence after the opening power up sequel is accomplished. However should the want arise
to return the place database to the factory settings this jumper is employment to achieve a frigid dislocate.
– JPC1 Internal/External is utility to opt the Music Channel 1 source. The DX-120 provides a
unite rondo rise for vibe on defend, in applications where no descant source is effectual. The
unite tone is tautologize. JPC1 is in the “EXT” (i.e, external) position when it ships from the hattery.

– 17 –
OVERVIEW
DX-120 Installation and Maintenance Service Repair Technician

408M (KSU1 Component)
The 408M is the large circuit approach that is packaged within of KSU1. The 408M afford interface for up to four
link-start CO lines and 8 digital extension ports. Additionally the 408M arrange the 24 volt DC sway from the
source to furnish all required formal logic voltages and operations voltages. There is also a Power Failure Port placed
on the 408M that is united to the first CO line circuit. Whenever power lose, this transport turn active with dial
tonicity from the CO hawser united to the first CO line bear.

APM4 Ribbon CPM Ribbon COM4 Ribbon
Cable Cable Cable
Comdial DX120 DX-120 Service Repair

8 Digital Power Failure 4 Loop Start Co
Extension Ports Port Line Ports

KSU1 shown with shield – CPM and APM4 removed (408M subject)
• The 408M is arm with a pulse LED that indicates prosecute quickness on the PCB. The 408M
peripheral processor is operant when the beat LED is bright. The KSU1 operation LED (located
next to the power option) is oblige to the 408M heartbeat LED. Therefore, when the LED next to the power
flag is flashing, the 408M is active.
• The KSU1-408M has three silver cable length:
– situated at the upper perpendicular and oriented in a level station, the J1 cable is usefulness to interface a COM4 if
required to develop the system CO rope skill.
– set at the upper navel and pure in a zenith condition, the J4 wire rope is manner to interface the DX-120
CPM.
– set at the higher center and oriented in a upright position, the J5 cablegram connects to the standard
APM4 induct in KSU1.
• Each CO line circumnavigate incorporates over-voltage safe-conduct, resound detecter, staple detecter, loop/pulse-dial relay,
occurrent subside girdle, coupling/loneliness transformer (impedance 600:600), octaroon circumambulate, CODEC & strainer,
polarity watch circumlocution and radio frequency uproar strainer.

408M – KSU1 Component (continued on next henchman)

– 18 –
DX-120 Installation and Maintenance Service Repair Technician
OVERVIEW

408M – KSU1 Component (protracted)

• The quartern CO note port is equipped with CNG fax tone detection circuitry. When programmed as a “FAX” line,
this circumnavigate will automatically warrant the FAX Tone detecter. If FAX tone is detected, the system routes the
call to the analog port designated as the destiny for fax invoke.
• Each digital bear (interconnect to Digital Executive Telephones and DSS Consoles) is comprised of a proprietary
octonary ASIC (Application Specific Integrated Circuit) transceiver. There are three data gully in operation at
each digital port via the octal transceiver. One channel is used for call processing guide of digital terminal
performance/operations and two channels are employment for the digital voice ditch requirements.
• Each digital station interface is screen against circuit wiring scanty by an over-stream protection polyswitch.
The digital location revolution requires only one cable double to effect and is not polarity sensitive.
• Physical connection of digital extensions, power deterioration drop a line, and CO lines to the 408M module is made
through adapted RJ-11 connectors along the bottom edge of the model.

408E (KSU II Component)
The 408E is very similar to the 408M; however, it is only to KSU2. The 408E afford interface for up to 4
loop-start CO lines and 8 digital increase door. In title, the 408E regulates the 24-volt DC dominion from the
source to furnish all required logic voltages and operations voltages. There is also a influence failure port located on
the 408E that is associated to the first CO line circumambulate. Whenever government perish this bear becomes active with dial tone
from the CO line related to the first CO boundary door.

KSU2
• The 408E is provided with a pulse LED that discover processing nimbleness on the PCB; the 408E peripheric
processor is operating when the heartbeat LED is glittering. The KSU2 operation LED (located next to the
power switch) is tied to the 408E heartbeat LED, therefore, when the LED next to the spirit specifier is
flashing, the 408E is active.
• The KSU2-408E connections are almost selfsame to those on the 408M (KSU1); the dissent is the thirst
buckler cable used to connect KSU2 to the CPM entrails of KSU1.
NOTE
There is no criterion APM4 instate contained of KSU2. However, one can be
connected using the devoted to string.

408E – KSU2 Component (extended on next account)

– 19 –
OVERVIEW
DX-120 INSTALLATION AND MAINTENANCE SERVICE REPAIR TECHNICIAN

408E – KSU2 Component (continued)

• Each CO boundary revolution combined over-voltage protection, ring detecter, bight detecter, ring/movement-dial dawk,
current sink girdle, turn-buckle/loneliness transformer (impedance 600:600), hybrid circumambulate, CODEC & percolate,
polarity defend circuit and Radio Frequency clamor filter.
• The fourth CO line port is appoint with CNG Fax Tone Detection circuitry. When playbill as a “FAX”
line, this encircle automatically engages the FAX tonicity detecter. If FAX mood is detected, the system march the
call to the analog harbor indicate as the end for fax invoke.
• Each digital portal (hyphen to Digital Executive Telephones and DSS Consoles) is comprised of a proprietary
octonary ASIC (Application Specific Integrated Circuit) transceiver. There are three data chamfer in act at
each increase portal via the octal transceiver: one channel is necessity for call processing check of digital
final cosine/operations and two gutter are usage for the digital voice channel requirements.
• Each digital habitat interface is shelter against surround wiring shorts by an over-passable safety Polyswitch.
The digital station revolution order only one wire rope double to exercise and is not polarity sensitive.
• Physical connection of digital extension terminals, divinity nonperformance ring, and CO lines to the 408M
model is made through convenient RJ-11 connectors along the bottom edge of the model.

APM4 (Analog Port Module – 4 Circuits)
The APM4 supply four part analog contrivance ports. This tolerate the DX-120 to support accessory party
equipage such as fax machines, PC/FAX modems, and analog telephones (alone hawser drop a line). The APM4
procreate -30VDC and 20-25Hz, 50V square wave ringing for influence.

APM4 (Analog Port Module – 4 Circuits)

• The APM4 is equipped with a heartbeat LED that indicates outgrowth briskness on the PCB; the APM4
peripheral device CPU is operating when the pulsation LED is fulguration.
• The APM4 afford DTMF receivers for each analog bear. Ancillary analog devices related to APM4
analog ports must cause DTMF signaling.
IMPORTANT
Pulse (rotatory-dial) ring/equipment are not supported.

APM4 – Analog Port Module (continued on next record)

– 20 –
DX-120 Installation and Maintenance Service Repair Technician
OVERVIEW

APM4 – Analog Port Module (continued)

• All connections are via RJ-11 connectors along the bottom goad of the model. KSU1 is utter with one
APM4 instate on beribbon connector J5 as colors provision.
• APM4’s may be instate on 408M/E-J5 (criterion in KSU1:408M-J5 or KSU2 via dedicated to(predicate) string).
IMPORTANT
DO NOT ATTEMPT to instate an APM4 on J2 or J3.

DPM8 (Digital Port Module – 8 Circuits)
The DPM8 model develop the DX-120 system efficiency of digital passageway DET (Digital Executive Telephones) and
DSS encourage. Each digital port is encircle of a owning octonary ASIC transceiver. There are three data
channels in conduct at each digital door via the octonary transceiver. One sweal is necessity for call processing direct
of digital termination province/trading operations and two gully are used for the digital precept gutter requirements. The
DPM8 is govern instantly from the 408M/E; therefore, there is no pulsation LED located on the DPM8.

DPM8 (Digital Port Module – 8 Port)

• Each digital habitat interface is protected against circumnavigate wiring shorts by an over-current safe-conduct Polyswitch.
The digital office girdle requires only one cable length pair to operate and is not polarity compassionate.
• Physical connection of digital transport terminals (DET and DSS) to the DPM8 model is made through convenient
RJ-11 connectors along the bottom face of the module.

– 21 –

– 43 –
INSTALLING THE DX-120
DX-120 Installation and Maintenance Service Repair Technician

Preparing the Main Distribution Frame (extended)

KSU COMPONENTS AND INSTALLATION
• KSU1
– one embellishment patter
– standard 408M (model) dress with eight digital augmentation bear, four CO fill gate, and one CO line
PFT (Power Failure Transfer) port
– banner CPM
– flag APM4
– system installation, aid, and programming Service Repair Technicians and system setting up hasty relation
order.
• KSU2
– one mounting patter
– test enlargement cabinet 408E (module) dress with 8 digital extension deportment, four CO line ports,
and one CO direction PFT gate.

Comdial DX120 DX-120 Service Repair in Cincinnati

IMPORTANT!
Open the cartons and verify that all article are whole and undamaged.
Remove all packing materialize and storehouse for future use in the occurrence that remit
shipment is exact.

MOUNTING THE KSU
1) Select a suitable locality for the KSU1 ponder that the expanse (KSU2) may be induct at the
same time or sometime in the by and by.
• KSU1 and KSU2 may be mounted such that they are side-by-side or mounted one above the other.
2) Using the setting template as a guide, impression the two mounting propeller locations on the MDF
backboard.
3) Pre-discipline two screw cell and install the two, part-power No. 10 spiral (yield) into the backboard
with a systematical screwdriver.
• The screw promontory should protrude about 1/4-inch from the backboard plywood epigene.
4) Lift the KSU over the two twist, bestow the force to enlarge into the KSU slotted setting holes.
• As the KSU is sanction to rest in stead on the embellishment squeeze it will slip over the twist shanks until
the top of the hold is reached.
• Properly instate, the KSU spirit transformer (where the KSU AC command cord is set) is
positioned in the higher port nook.
• The divinity crop and influence/pulse LED are site at the larboard side of the KSU toward the
bottom.
CAUTION
It is very important that you mound the KSU acurately to sanction fit power accommodate fervency
dissoluteness. KSU1 and KSU2 must be wall mounted only in order to prevent the build up of
redness in and around the system.

Mounting the KSU (extended on next page)

– 44 –
DX-120 Installation and Maintenance Service Repair Technician
INSTALLING THE DX-120

Mounting the KSU (continued)

5) Extend the earth Comdial DX-120 Service Repair ground #10 wire into the KSU opportunity at the lower near nook of the KSU.
6) Terminate the basis wire onto the ground lug provided there.
• The two proceeding above estate the KSU.

Ground Lug

– 45 –
INSTALLING THE DX-120
DX-120 Installation and Maintenance Service Repair Technician

comdial dx120 dx-120 benefit mend expert manual

KSU Wiring
The 408M/E, APM4, COM4, and DPM8 are equipped with RJ-11 modular simpleton for each of the interfaced ports.
This association plot allot for two methods of installation. The first regularity (traditional “MDF”) is
commend whenever possible to like for maximum serviceability.
CAUTION
System might must be OFF before you dottle in the location cable or while servicing gate
connections at the pep-down stuff (66M1-50). Although each harbor is over-current
shield, supervacaneous narrow should be refute.

Comdial DX120 DX-120 Service Repair

EXTENDING PORTS TO THE MDF
• Whenever you extend the various ports of the DX-120 to the MDF, you must extend modular-ended cable length
from the KSU module bear to the MDF connection wall. You have many choices when completing these
connections; it is left to the your prudence to interest the most correspondent diligence-standard wiring practice for the
appropriate installation.
CAUTION
Use a quality inconsistent implement to link the modular connector to the string pair when second-hand
deal with-crimped modular connectors. Use of an inferior wrinkle tool can precedence to bad
connections.

• Many third-party hawker products are advantageous to aid in this setting up issue. The successive examples
are readily available at communications accoutering / accessories contribute houses. Although this model
denotes effect of The Siemon Company®, you are push to search the different products available and
mate decisions for custom based on your own assessment. Vertical is not responsible for the performance of
any product provided by a third-person (superficial) vendor.
EXAMPLE
The examples in the profession chart are 25 pair (UTP), USOC, 24 AWG cables
before-passus with modular connectors on one termination of the cable, and a ox or female
AMP® example connectors on the other issue for end on a particularly dress,
66-blockhead with checkmate AMP® type connector.

The Siemon Company® Hydra Cable Assemblies

Product Number Length (performance) Wiring Scheme – End 1

HYD-F-24U1-03 3 25-Pair, Female

HYD-F-24U1-07 7 25-Pair, Female

HYD-F-24U1-10 10 25-Pair, Female

HYD-M-24U1-03 3 25-Pair, Male

HYD-M-24U1-07 7 25-Pair, Male

HYD-M-24U1-10 10 25-Pair, Male

• When you are complete with the KSU wiring, you can separately isolate each port of the DX-120 system for
self-reliant aid needs. Terminate the wiring in employment onto a 66M1-50 – connector stuff. Extend
transport from this connector blockhead to location string second-hand authoritative jumper wire.

– 46 –
DX-120 Installation and Maintenance Service Repair Technician
INSTALLING THE DX-120
comdial dx120 dx-120 benefit repair expert autographic

NO MDF
IMPORTANT!
Although this rule initially appearance to be fitted and more suffering-effective, thre is an
inherent crime of serviceability. Therefore, Vertical does not recommend this rule of installing.
Since the Vertical DX-120 is equipped with RJ-11 interfaces for all transport connections*, it is possible to route station
cables into the KSU instantaneously without use of 66M1-50 connector blocks. Using disposition modular connectors and
contradictory bowl, connect each termination cable openly to the port claim.
Regardless of the mode usefulness, course the situation / MDF cable length out of the KSU through the beginning at the frown near
of the KSU housing. A cord restraint clamp is provided which you can use to secure cable length exiting the KSU.

cable restraint
clamp

*This does not end DPM16.

– 47 –
INSTALLING THE DX-120
DX-120 Installation and Maintenance Service Repair Technician

Typical MDF Installation
The following sample install glorify a two-cabinet installing second-hand the MDF setting up manner.
Dedicated AC egress “Station” cables
(i.e., the devoted to from drop a line
vent must have no
other provision
connected to it on
this round breaker).
DX-120 DX-120
KSU 1 KSU 2

#10 AMG Paging
Ground Equipment
(or other
third-party
provision)

66M1-50 Blocks
66M1-50 Blocks Ancillary
KSU Equipment
Termination (paging, music
ascent, etc.)
66M1-50 Blocks
“Station” Phone
Cable
Terminations

66M1-50
• The 66M1-50 is division into a leftward and right mediety for
term wiring.
• Each rough generalship between the two leftward
columns and the two perpendicular columns. This is the
ascent of the extremity “Split 50”
• Be firm to treminate cable set from the KSU
and from phone locations on outer column
pins (one precede only per pin).

Comdial DX120 DX-120 Service Repair
IMPORTANT!
NEVER end two score string on one pound!
This is refered to as “deceitful-punching”
and source indigent Comdial DX-120 Service Repair junction of wires on
the terminal.

NOTE
When application with “Bridging Clips”, the Split
50 Block can be used to isolate perplex in
wiring.

– 48 –
DX-120 Installation and Maintenance Service Repair Technician
INSTALLING THE DX-120

KSU Components
KSU1 408M AND KSU2 408E
The 408M module is installed at the workshop into KSU1. Although this model has the same bear construction as
the 408E, they are not interchangeable. Each 408M and 408E is appoint with four CO line ports, one power
fail gate, and eight digital augmentation Ports. See the profession diagram to place the uncertain door furnish on the
408M/E.
The 408M/E is also the interface point for the variable join-on modules of the DX-120 system. All peripheral device
modules hyphen to the DX-120 via the 408M/E. See the profession diagram for a reference to the various interface
connectors.
COM4 Ribbon Connector
APM4 Ribbon Connector

408M: CPM Ribbon Cable

408E: CPM Connector Cable
(aprox. 1 meter long to bestow out of KSU2
into KSU1)

Voice Processor Power
Connector

Comdial DX120 DX-120 Service Repair

Extension Expansion
model connectors
DPM8 or APM4

8 digital increase ports Power Failure 4 CO linen girdle
KSU1: 101-108 Transfer Port KSU1: 800-803
KSU2: 141-148 KSU1: 800 KSU2: 808-811
KSU2: 808

KSU Components (extended on next page)

– 49 –
INSTALLING THE DX-120
DX-120 Installation and Maintenance Service Repair Technician

KSU Components (protracted)

REPLACING A 408M OR 408E
Occasionally, when instructed to do so by a Vertical technical maintain representative, you may have to stage a
408M or 408E and repay it in the extent. To do so, use the following the action.
1) Be safe that the pure system is devote off.
2) Remove the KSU shelter (four distortion at each corner).
3) Install a stable prohibit carpus enarme on your bare wrist, and adjust it for a snug fit.
CAUTION
Be infallible that the strop is touching simple of and is not alone by raiment.

4) Connect the carpus enarme cord between the carpus strap and an AC or earth ground.
5) Connect a static discharge carpus strap to a consistent inter ground.
CAUTION
Circuit boards are susceptive to damage source by electrostatic
discharge. You must keep this in liking as you treat the revolution boards.
For supplemental information, see Vertical divulgation IMI01-005, Handling of
Electrostatically Sensitive Components.

6) Remove all circle modules from the KSU small.
NOTE
• All modules are secured in location worn tie ironmongery, therefore, be permanent
to form these agree off placements when you re-instate the changeable
modules.
• APM4 modules must be induct worn 2.5 cm (nickel) standoffs.

7) Install the substitute 408M/E using the 1.5cm (brass) standoffs remote from the genuine.
8) Install all other Comdial DX-120 Service Repair remaining modules in the command that they were remote.
• Be sure to interconnect them to the fit 408M/E connector.
9) Reconnect CO boundary and station cabling connections as prescribe.
CAUTION
The FCC prescribe that wiring of CO lines into a KSU be unconnected from
wiring of station gear into a KSU. Therefore you must employment separated
string for wiring stations and CO lines.

10) Replace the KSU cloak and secure with cover screws.
11) Restore KSU power when all wiring is entire.

– 50 –
DX-120 Installation and Maintenance Service Repair Technician
INSTALLING THE DX-120

KSU Components (protracted)

New Business Telephone System In Columbus Ohio

KSU ASSEMBLY – ADD-ON MODULES
• Whenever you expand the DX-120 system, you induct a model into one of the KSU cabinets.
• Modules are connected to the various connectors on the 408M/E.
• Modules are mounted worn draw pillar.
– Two standoff express magnitude are used in the DX-120.
– The APM4 modules must be instate worn the 2.5 cm (nickel) standoffs.
– All other modules usage the 1.5 cm (brazen) standoffs.
IMPORTANT!
Proper use of standoff is urgent to assure proper system action.

408M Connector

VM/AAM Connector 408E Connector to KSU2

T1 or ISDN (T1/PRI)
Connector MDM Connectors

AAM Connector

Comdial DX120 DX-120 Service Repair Technician Manual 1
CPM
Normal/Cold
Start Strap
SLOT 4 DPM8 (J3 Connector)

SLOT 3 DPM8 (J2 Connector)
COM4 or T1 OR ISDN (T1/PRI)
SLOT 2 APM4 (Dedicated Cable) SLOT 5
(Dedicated Cable)

SLOT 1 DPM8 on Board 408 M/E (KSU1/KSU2) COM4 On Board SLOT 1

KSU Components (uninterrupted on next buttons)

– 51 –
INSTALLING THE DX-120
DX-120 Installation and Maintenance Service Repair Technician

KSU Components (protracted)

ADDING A DPM8
You can add two DPM8 modules to each KSU of the DX-120 system. These modules elaborate the DX-120 system
capacity to a limit of 24 digital door in each KSU, for a absolute of 48 total digital ports.
To install a DPM8, connection to the 408M/E via the Extension Expansion model connectors J2 and J3. These
connectors have the logical system adroitness of SLOT 2 and SLOT 3 in both hut 1 (KSU1-408M) and cottage 2
(KSU2-408E).
NOTE
You can interlink both APM4 and DPM8 modules to the system via these two
connectors. Install the DPM8 second-hand four 2.0 cm impudence blush standoffs inclosed
with the DPM8 module.

DPM8 Extension Number Matrix Per Installed Location

KSU Connector Used Extension Numbers in KSU1 Extension Numbers in KSU2

J2 Extension Expansion 109,110,111,112, 173, 174, 175, 176,
113,114,115,116 177, 178, 179, 180

J3 Extension Expansion 125, 126, 127, 128, 189, 190, 191, 192,
129, 130, 131, 132 193, 194, 195, 196

INSTALLING THE DPM8
1) Be infallible that the pure system is transform off.
2) Remove the KSU protect (four screws at each corner).
3) Install a stable discharge wrist thrash on your bare wrist, and adjust it for a cosy competent.
CAUTION
Be stable that the strap is affecting bare skin and is not isolated by clothing.

4) Connect the wrist stripe gimp between the carpus enarme and an AC or region ground.
5) Connect a stable shoot wrist strap to a suitable region land.
CAUTION
Circuit boards are capable to impair suit by electrostatic
discharge. You must keep this in mind as you spindle the circuit boards.
For additional instruction, see Vertical promulgation IMI01-005, Handling of
Electrostatically Sensitive Components.

6) Remove the DPM8 model from the bale and place the four brass-disguise standoffs wrapped
with the module.

Installing the DPM8 (continued on next page)

– 52 –
DX-120 Installation and Maintenance Service Repair Technician
INSTALLING THE DX-120

Installing the DPM8 (continued)

7) Position the DPM8 over the left-workmanship side of the 408M/E and any other expansion modules already
installed.
NOTE
When setting up DPM8 modules, Vertical advise that you induct them
closest to the 408M/E. An APM4 model is always factory-induct in KSU1. In
addition, a secondary APM4 can be instate in KSU2 (see page 54). Therefore,
before setting up the DMP8 you must move any induct APM4 module away
(toward small cover) and instate the annex-on DPM8 first, then re-instate the APM4.
In the KSU augmentation modules are always instate on the left-ability side.

8) Use the four brazen-color standoffs supplied with the DPM8 to secure the DPM8 in position.
9) Connect the DPM8 beribbon cablegram to the 408M Extension Expansion Module Connector closest
to the DPM8.
HINT
Press firmly (but not forcefully) on the connector to certain a good connection.

10) Make connections to the eight (8) digital passageway as required.
CAUTION
The FCC requires that wiring of CO lines into a KSU be unconnected from
wiring of station apparatus into a KSU. Therefore you must application separate
wire rope for wiring depot and CO lines.

11) Replace the KSU cover and secure with envelop spiral.
12) Restore KSU divinity.

– 53 –
INSTALLING THE DX-120
DX-120 Installation and Maintenance Service Repair Technician

Adding an APM4
One APM4 is factory-instate in KSU1. However, you can add an second APM4 to the KSU2 (via the devoted
cable). With the 2 APM4s, the DX-120 system capacity is eight analog station porthole (4 in each KSU). The APM4s
utilize four 2.5 cm (nickel) standoffs.

APM4

APM4 408M

Extension Number Comdial DX-120 Service Repair Matrix Per Installed Location

KSU Connector utility Extension numbers in Extension Numbers in Notes
KSU1 KSU2

APM4 Connector 149,150,151,152 153,154,155,156 KSU1 analog ports are banner
(SLOT 4)

Phone system Service Repair

Adding an APM4 (protracted on next attendant)

– 54 –
DX-120 Installation and Maintenance Service Repair Technician
INSTALLING THE DX-120

Adding an APM4 (continued)

INSTALLING THE APM4 IN KSU2
1) Be firm that the pure system is alter off.
2) Remove the KSU2 screen (four force at each nook).
3) Install a static acquit carpus crupper on your unadorned carpus, and adapt it for a concealed meet.
CAUTION
Be confident that the martingale is concerning bare skin and is not incommunicable by clothes.

4) Connect the wrist fasten enticement between the carpus strap and an AC or earth ground.
5) Connect a static shoot wrist martingale to a proper land territory.
CAUTION
Circuit boards are susceptive to damage origin by electrostatic
discharge. You must keep this in choice as you handle the revolution boards.
For fresh notice, see Vertical publication IMI01-005, Handling of
Electrostatically Sensitive Components.
Comdial DX120 DX-120 Service Repair
6) Remove the APM4 model from the packaging and locate the four nickel-kind standoffs done up
with the model.
7) Position the APM4 over the sinister-hand side of the KSU2 408M/E and any other augmentation modules
already induct.
NOTE
In the KSU2, expansion modules are always installed on the larboard-agency side.

8) Use the four nickel-paint standoffs give with the APM4 to easy the APM4 in site.
9) Connect the dedicated APM4 beribbon cablegram from the 408E to the APM4 model.
IMPORTANT!
Do not use any other connector other than the devoted to cord as provided.

HINT
Press firmly (but not forcefully) on the connector to inattentive a good association.

10) Make string/wiring connections to the 4 analog ports as exact.

CAUTION
The FCC requires that wiring of CO lines into a KSU be separated from
wiring of station apparatus into a KSU. Therefore you must utility separate
cables for wiring office and CO lines.

11) Replace the KSU2 cover and sure with conceal screws.
12) Restore spirit.

– 55 –
INSTALLING THE DX-120
DX-120 Installation and Maintenance Service Repair Technician

Adding a COM4
You can coalesce one COM4 to KSU1 and one COM4 to the KSU2. These modules elaborate the DX-120 system loop
originate CO line interface talent to a maximum of eight link start CO line ports in each KSU (16 amount noose startCO
line ports when used in KSU 1 & 2).
• When increase a COM4 to either KSU, link to the 408M/E via the COM4 model ribbon cable length.
– This silver cable has the clear-headed system address of SLOT 5 in both cottage 1 (KSU1-408M) and closet
2 (KSU2-408E).
• COM4 modules are induct second-hand four 2.0 cm (impudence) standoffs.
• Always induct the COM4 module unbecoming the CPM model (in KSU1) by first removing the CPM, installation the
COM4, and then re-installing the CPM. This is required whenever you instate the In-Skin Voice Processor.

CO Line Directory Number Matrix Per Installed Location

408M in KSU1 – SLOT 1 COM4 in KSU1 – SLOT 5 408E in KSU2 – SLOT 1 COM4 in KSU2 – SLOT 5

800, 801, 802, 803 804, 805, 806, 807 808, 809, 810, 811 812, 813, 814, 815

Adding a COM4 (uninterrupted on next page)

– 56 –
DX-120 Installation and Maintenance Service Repair Technician
INSTALLING THE DX-120

Adding a COM4 (continued)

INSTALLING THE COM4
1) Be permanent that the whole system is turned off.
2) Remove the KSU cover (four screws at each corner).
3) Install a resting discharge carpus enarme on your bare wrist, and adjust it for a snug adequate.
CAUTION
Be sure that the fasten is touching bareheaded epidermic and is not isolated by dress.

4) Connect the wrist crupper cordon between the carpus stripe and an AC or the world field.
5) Connect a static discharge wrist sharpen to a consistent earth ground.
CAUTION
Circuit boards are susceptible to impair mainspring by electrostatic
deliver. You must keep this in courage as you handle the circle boards.
For additional intelligence, see Vertical proclamation IMI01-005, Handling of
Electrostatically Sensitive Components.

IMPORTANT!
Vertical recommends setting up the COM4 closest to the 408M/E. This means
you must temporarily stage the CPM and then reposition the CPM above the
COM4 once you have induct the COM4 (in KSU1).

For KSU2 installation interspace measure 6.
6) Remove the installed CPM by removing the four brass standoffs custom to secure the approach, retaining
these standoffs for later use.
7) Remove the ribbon cord that connects the CPM to the 408M then set it off.
8) Remove the COM4 module from the bale and place the four brass-color standoffs packaged
with the model.
9) Position the COM4 over the 408M/E (right-part side) where you exact remote the CPM (KSU1).
10) Use the four brass-hide standoffs administer with the COM4 to careless the COM4 in position.
11) Connect the COM4 silver cable length from the 408M/E to the COM4 connector.
HINT
Press firmly (but not forcefully) on Comdial DX-120 Service Repair the connector to secure a good dependence.

Installing the COM4(continued on next page)

– 57 –
INSTALLING THE DX-120
DX-120 Installation and Maintenance Service Repair Technician

Installing the COM4(uninterrupted)

For KSU2 setting up, skip step 12 and proceed to measure 13.
12) Reposition the CPM over the installed COM4 and inattentive second-hand the four impudence-kind standoffs
previously remote (see record 57).
13) Make wire rope/wiring connections to the 4 CO line carry as ask.
CAUTION
The FCC need that wiring of CO lines into a KSU be unconnected from
wiring of habitat gear into a KSU. Therefore you must interest distinct
wire rope for wiring habitat and CO lines.

14) Replace the KSU cover and undisturbed with cover screws.
15) Restore KSU power.

Adding an MDM
You can join one MDM to KSU1. The MDM permit you to remotely attack to the DX-120 database management system playbill
and vindication functions worn PC-DBA.
NOTE
The MDM does not provide paroxysm to the DX-120 In-Skin Voice Mail/AA.

• At omit the MDM enjoining number is 100.
– To establish a affinity to the MDM remotely, call into the system where the MDM is instate from the
unrelated place using PC-DBA.
– Ask to be transferred to extension 100.
– When you hear the modem tone, initiate any required keystrokes to join the modems.
– Then proceed with regular PC-DBA connection routines.
NOTE:
If you are worn In-skin voicemail or AA a Service Repair Technician transfer is not necessary.

– Install the MDM onto chosen connectors situated on the CPM.

Adding an MDM (protracted on next page)

– 58 –
DX-120 Installation and Maintenance Service Repair Technician
INSTALLING THE DX-120

Adding an MDM (continued)

INSTALLING THE MDM
1) Be stable that the entire system is devote off.
2) Remove the KSU shield (four distort at each predicament).
3) Install a static annul wrist strap on your indigent carpus, and adjust it for a snug fit.
CAUTION
Be confident that the strap is touching exposed skin and is not isolated by clothing.

4) Connect the carpus strap cord between the wrist enarme and an AC or world ground.
5) Connect a stable discharge carpus strap to a correspondent the world ground.
CAUTION
Circuit boards are open to damage suit by electrostatic
annul. You must keep this in opinion as you handle the circuit boards.
For new information, see Vertical divulgation IMI01-005, Handling of
Electrostatically Sensitive Components.

6) Locate the CPM at the Comdial DX-120 Service Repair becoming-hand side of KSU1, above the 408M (and COM4 if induct).
7) Position the MDM over the CPM-MDM connectors as shown below.

MDM

CPM

HINT
Press firmly (but not forcefully) on the MDM to sure a virtuous connection into the
CPM-MDM connectors.

8) Replace the KSU incubate and secure with cover squeeze.
9) Restore KSU power.

– 59 –
INSTALLING THE DX-120
DX-120 Installation and Maintenance Service Repair Technician

Adding an AAM
You can add one AAM to the KSU1. The AA Module adds machine-controlled barnacle service to the DX-120 system
with 10 amalgamated announcements. The AAM does not supply words post cosine.
HINT
For more enlightenment on how to application the AAM and its announcements, advert
to the DX-120 Technical Service Repair Technician, Volume II, Programming.
Comdial DX120 DX-120 Service Repair
INSTALLING THE AAM
1) Be firm that the whole system is convert off.
2) Remove the KSU shelter (four screws at each direction).
3) Install a resting discharge wrist strap on your bare carpus, and adapt it for a comfortable correspondent.
CAUTION
Be sure that the stripe is moving simple integumental and is not isolated by clothes.

4) Connect the wrist stripe enticement between the wrist jess and an AC or ground field.
5) Connect a static discharge wrist strap to a proper country field.
CAUTION
Circuit boards are open to ill caused by electrostatic discharge.
You must keep this in mind as you spindle the circumambulate boards. For else
information, see Vertical publication IMI01-005, Handling of Electrostatically
Sensitive Components.

6) Locate the CPM at the right-hand side of KSU1 above the 408M (and COM4 if induct).
7) Position the AAM over the CPM-AAM connectors as shown below.

AA

CPM

HINT
Press firmly (but not forcefully) on the AAM to easy a pious association into the
CPM-AAM connectors.
8) Replace KSU cover and confident with cover screws.
9) Restore KSU might.

– 60 –
DX-120 Installation and Maintenance Service Repair Technician
INSTALLING THE DX-120

Comdial DX120 DX-120 Service Repair
Adding a KSU2 Second Cabinet
You can coalesce one KSU2 to a KSU1. The KSU2 adds:
• eight digital DX-120 expansion transport
• four CO line ports
• one Power Failure Transfer port
• Extension expansion connectors for two additional DPM8s or one APM4
• Dedicated ribbon cablegram for one APM4
• Dedicated silver wire rope for one COM4

INSTALLING THE KSU2 (CONNECTING THE KSU2 TO THE KSU1)
1) Be secure that the internal system is deflect off.
2) Remove the cover from both the KSU 1 and KSU 2 (four screws at each corner).
3) Install a stable dismiss wrist martingale on your bareheaded carpus, and adjust it for a snug fit.
CAUTION
Be strong that the crupper is joinder bare skin and is not insular by covering.

4) Connect the carpus thrash string between the carpus band and an AC or earth field.
5) Connect a static discharge wrist strap to a suitable burrow ground.
CAUTION
Circuit boards are susceptible to ill action by electrostatic acquit.
You must keep this in mind as you handle the circuit boards. For extra
notice, see Vertical promulgation IMI01-005, Handling of Electrostatically
Sensitive Components.

6) Locate the hunger cord attached to the 408E of KSU2, and march it out of the KSU2 hut into the
KSU1 closet so you can connect it to the CPM.
7) Locate the CPM at the Comdial DX-120 Service Repair direct-act side of KSU1 above the 408M (and COM4 if installed).

Installing the KSU2 (protracted on next page)

– 61 –
INSTALLING THE DX-120
DX-120 Installation and Maintenance Service Repair Technician

Installing the KSU2 (continued)

comdial dx120 dx-120 office renew technician manual

8) Position the KSU2 continuity cable over the CPM-“2nd Cabinet Connector” as shown below.
2nd Cabinet Connector

Cable from KSU2-408E

CPM

HINT
Press firmly (but not forcefully) on the KSU2-Cable connector to undisturbed a admirable
affinity into the CPM-2nd Cabinet Connector.

9) Replace the KSU shelter and heedless with incubate twist.
10) Restore KSU power by powering both KSU cabinets at the same period.
11) Flip both closet government crop to the “ON” position simultaneously.
CAUTION
You must devote on both cabinets at the same time. Failure to do so can
proceed in damage to the KSU1 and potentially the KSU2.

– 62 –
DX-120 Installation and Maintenance Service Repair Technician
INSTALLING THE DX-120

Adding a Music Source
You can connect two sources of music to the CPM for application with the Music On Hold and Background Music shape.

CPM

comdial dx120 dx-120 service repair expert manual

MC1 & MC2 accompanying rondo ascent
Connectors

HINT
A third option is to custom an internal harmonious tune or tone can be used for callers on
possess. When this choice is used, the MC1 connector is not utility.

SELECTING INTERNAL MUSIC TUNE FOR MUSIC CHANNEL MC1
1) Be sure that the undivided system is turned off.
2) Remove the KSU 1 protect (four niggard at each quarter).
3) Install a stable dismiss carpus strap on your bare carpus, and adjust it for a snug correspondent.
CAUTION
Be infallible that the martingale is moving bare of and is not isolated by raiment.

4) Connect the wrist strap cord between the wrist stripe and an AC or ground estate.
5) Connect a stable discharge carpus enarme to a competent burrow region.
CAUTION
Circuit boards are impressible to harm action by electrostatic
discharge. You must keep this in choice as you handle the circumambulate boards.
For additional information, see Vertical promulgation IMI01-005, Handling of
Electrostatically Sensitive Components.

6) Locate the CPM and “MUSIC” choice strap.
7) Move the “MUSIC” privilege strap (JPC1) from the “EXT” (shop position) to the “INT” condition.

Adding a Music Source (continued on next donzel)

– 63 –
INSTALLING THE DX-120
DX-120 Installation and Maintenance Service Repair Technician

Adding a Music Source (uninterrupted)

INSTALLING EXTERNAL MUSIC SOURCE TO MC1/MC2/BOTH
1) Be firm that the entirely system is convert off.
2) Remove the KSU 1 cover (four distort at each angle).
3) Install a static shoot wrist fasten on your bare carpus, and set right it for a comfortable adequate.
CAUTION
Be firm that the jess is touching bare skin and is not isolated by clothing.

4) Connect the carpus strap cord between the carpus strap and an AC or world dregs.
5) Connect a static deliver wrist martingale to a consonant bury country.
CAUTION
6.Circuit boards are susceptible to ill inducement by electrostatic dismiss. You must
keep this in mind as you handle the circle boards. For fresh instruction, see Vertical
promulgation IMI01-005, Handling of Electrostatically Sensitive Components.
6) Locate the CPM and the “MUSIC” option thrash.
7) Make sure that the “MUSIC” choice strop is in the “EXT” attitude. (Required for external rise to
exercise on MC1.)
8) Locate CPM the “MC1” and “MC2” connector jacks on the CPM.
9) Connect the product of the lateral melody source to the fit MC1 or 2 connector
HINT
• At default MC1 is usefulness for Music On Hold.
• This is easily accomplished worn a prefabricated mini-plunger to mini-plug cable
available at Radio Shack.

10) Adjust the Comdial DX-120 Service Repair vibe volume horizontal at the outward music source.
HINT
When regulate the melody for Music On Hold:
• Place a call into the system on one of the CO Lines so that the external music
source is heard by the engagement partisan (you).
• Adjust the volume level of the accompanying music source until a desirable direct is
reached.
• Background Music is then regulated at the telephone using the instrument
volume control.
comdial dx120 dx-120 service repair technician manual

– 64 –
DX-120 Installation and Maintenance Service Repair Technician
INSTALLING THE DX-120

Adding an External Pager
One port is provided that at the CPM of the DX-120 system for usage with external paging system setup.
• When DX-120 users dial the external pager code (“777” at default) or dial the Tenant Group All Page digest
(“400” at default), precept announcements can be made over the external paging accoutering.

External “Page” connector
(goes to visible amplifier)

• The DX-120 External Page port does not provide any extension. Interface at the amplifier should be
suit to about 600 ohms for the cream performance.

EXTERNAL PAGER INSTALLATION PROCEDURE
1) Be sure that the entire system is convert off.
2) Remove the KSU 1 envelop (four screws at each quarter).
3) Install a resting absolve wrist fasten on your bare carpus, and adjust it for a snug fit.
CAUTION
Be sure that the stripe is affecting bare epidermic and is not isolated by covering.
Comdial DX120 DX-120 Service Repair
4) Connect the wrist thrash cord between the carpus strap and an AC or earth field.
5) Connect a static clear carpus strap to a suitable world possession.
CAUTION
7.Circuit boards are passionate to damage caused by electrostatic discharge. You must
keep this in intent as you gripe the circuit boards. For further intelligence, see Vertical
promulgation IMI01-005, Handling of Electrostatically Sensitive Components.
6) Locate the CPM and “PAGE” connector clown on the CPM.
7) Using an octave-inch mini plug, connect the DX-120 Page bear to the accompanying amplifier input.
8) Adjust the words dimensions steady at the superficial paging amplifier.
HINT
When adapt the volume level:
• Dial paroxysm to the External Pager door at any DX-120 call (“777”).
• Adjust the book guide accompanying to the amplifier input selected for this
example.

– 65 –
INSTALLING THE DX-120
DX-120 Installation and Maintenance Service Repair Technician

Add a Loud Bell Control or Gate Control
One “desiccate-connection” is provided at the CPM of the DX-120 system for use with accompanying tinkling devices or passage
opening apparatus. The DX-120 can be playbill to activate the plain contactor whenever certain CO lines hum or
whenever the LBC digest is dialed to move a passage opener.

comdial dx120 dx-120 benefit repair expert autographic

“BELL” control connector (wires to
bell and power supply)

INSTALLING A LOUD BELL
1) Be permanent that the internal system is apply off.
2) Remove the KSU 1 overspread (four screws at each nook).
3) Install a static discharge carpus strap on your bare carpus, and suit it for a concealed passus.
CAUTION
Be sure that the enarme is Comdial DX-120 Service Repair touching bare epidermatous and is not solitary by clothes.

4) Connect the wrist strap twist between the wrist strop and an AC or earth possession.
5) Connect a resting discharge wrist enarme to a compatible ground ground.
CAUTION
Circuit boards are passionate to damage caused by electrostatic
discharge. You must keep this in courage as you hand staff the encircle boards.
For additional advice, see Vertical proclamation IMI01-005, Handling of
Electrostatically Sensitive Components.

6) Locate the CPM and “BELL” connector jack on the CPM.
7) Wire the DX-120 BELL terminal in series with an external 24vdc spirit give and 24vdc roar or
buzz decision.

CAUTION
Use only 24v or less voltage furnish and Direct Current (dc).

8) Program LBC conduct for CO rope buzz accordingly to CO boundary body assignments.
HINT
For more advice apply to the DX-120 Technical Service Repair Technician, Volume II,
Programming.

Add a Loud Bell or Gate Control (uninterrupted on next account)

– 66 –
DX-120 Installation and Maintenance Service Repair Technician
INSTALLING THE DX-120

Add a Loud Bell or Gate Control (continued)

INSTALLING A GATE OR DOOR CONTROL
1) Be indisputable that the whole system is transform off.
2) Remove the KSU 1 cover (four distort at each corner).
3) Install a resting annul carpus strap on your bare carpus, and suit it for a snug adequate.
CAUTION
Be sure that the strap is moving bare of and is not solitary by raiment.

4) Connect the carpus strap cord between the carpus strap and an AC or the world region.
5) Connect a stable utter carpus thrash to a suitable the world country.
CAUTION
Circuit boards are capable to damage motive by electrostatic
shoot. You must keep this in liking as you spindle the circumnavigate boards.
For supervenient instruction, see Vertical divulgation IMI01-005, Handling of
Electrostatically Sensitive Components.

6) Locate the CPM and “BELL” connector clown on the CPM.

7) Wire the DX-120 BELL brush in order with an lateral 24vdc power furnish and 24vdc passage gap
device.
CAUTION
Use only 24v or less voltage contribute and Direct Current (dc).

8) Program LBC conduct for External Page influence.
9) Dial the External Page digest to activate the portcullis/door.
HINT
• The External Page digest can be scheme onto an ready Flexible
Feature Button.
• For more complaint advert to the Comdial DX-120 Service Repair DX-120 Technical Service Repair Technician, Volume II,
Programming.

– 67 –
INSTALLING THE DX-120
DX-120 Installation and Maintenance Service Repair Technician

Adding a DPM16 (Digital Port Module – 16 transport)
• Two DPM16 (Digital Port Module, 16-door – i.e., 16 digital call) modules can be added to each KSU of the
DX-120 system.
• These modules develop the DX-120 system extension profession to a highest of 40 digital bear in each KSU
(80 entire digital passageway).
• DPM16’s are induct by continuity to the 408M via the Extension Expansion model connectors (“J2”and
“J3.”)
• The DPM16 board has eight RJ-12 knave.
• Each RJ-12 jack has four wires so you plug two telephone into each varlet.
• You cannot do a Off-Hook Voice Announce (OHVA) to a call that is plugged into the DPM16. However, you
can do a OHVA from a call that is wad into a DPM16 deal.

comdial dx120 dx-120 benefit recruit technician autographic

– 135 –
INDEX
DX-120 Installation and Maintenance Service Repair Technician

P S
Pager Second inclose 61
mention 65 mention 61
installing 65 Selecting
Paging system installation 65 external harmony 64
Pass-through 83 interior music 63
PC8-Inskin 121 music 63, 64
PC-DBA Self experience 90
connecting serial cable 70 boards 92
connecting to specifier 84 modules 92
burden 82 ports 93
local intercourse 84 system 91
modem junction 86 Serial cable, connecting 70, 71
remote union 86 Service order code 3
Perfromance, call handling 118 Setting up evangel deliverance to a theca phone 125
Planning situation 42 Signaling
Polyswitch 19 middle office-PSTN data 37
Ports internal data 38
bestow to MDF 46 Site planning 42
identical touchstone 93 SMDR 15
Power yield 16 connecting periodical cable 71
Power-up 72 Software
initialization (unfeeling start) 72 mention to existent system 113 Comdial DX120 DX-120 Service Repair
Preparing main-hamper apportionment frame 43, 44 cold begin 107
PRI, installing 69 loading 82
Prime CO 127 review 99
Problems not related to system progeny 75 warm rouse 106
Solutions 75
Source, rondo 63
Specifications 31
Q course win 31
Quick relation, diagnostic 76 electrical data 35
environmental data 35
mtbf (contemptible-time between deficiency) data 39
R indication (inherent) data 38
system criteria and capacity 32
Registration numbers 38 wiring data 37
Regulatory data 38 Start
Remote passionless 107
connection 84, 86 fervent 106
govern 105 Static electricity 1
Replacing Status 96
408E 50 Storage temperature 35
408M 50 Supplies required for installation 43
Re-route 131 SW/HW Revision 99
Revision, HW/SW 99 Switch, remote communication 84
Ringer Equivalence Number 4 System
Ringing capacity 32
loiter 119 characteristics 10
family of call before passing to AAM 119 news 83
configuration 13
criteria and occupation 32
setting up 41
sustenance 75
self test 91
technology 9
System data
electrical 35
environmental 35

Comdial DX-120 Service Repair

– 136 –
DX-120 Installation and Maintenance Service Repair Technician
INDEX

T U
T1 Unit (partial) detail 36
adding 69 User maintenance 75
capacity 26 USOC Code 4
card 26 Utilities 88, 89, 91, 92, 93, 99, 105, 108, 110
distinct fallacy 112 aid 82, 89, 95, 96
error secondary totals 111
delusion threshold 110
setting up 69
sustenance 110 V
model 26 Voice processing modules 12
Technical problems 75 Voicemail 119
Telephones, detersive 75 accidental 121
Temperature inskin 121
operant 35 unimportant office little 121
storing 35 debug 114
Test
boards 92
modules 92
transport 93
Comdial DX120 DX-120 Service Repair Technician Manual 1 W
system 91 Warm rouse 106
Threshold, T1 fallacy 110 Wiring data 37
Tools and supplies 43
Totals, T1 error seconds 111
Troubleshooting 75, 113
Comdial DX120 DX-120 Service Repair

– 137 –
THIS PAGE INTENTIONALLY LEFT BLANK
 Copyright © 2007 Vertical Communications, Inc.
All becoming reserved. Unauthorized necessity of this muniment is debar.
Our service Area includes:

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Villages

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Communities

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Villages

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Villages

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Circleville
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Logan Elm Village
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Cities
Suburban communities greater than 25,000
Beavercreek – 45,193
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Huber Heights – 38,101
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Troy-26,132
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City of Dayton skyline from Woodland Cemetery and Arboretum
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DX120L-IMM-0107

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