Network Cabling Cat6a

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Network Cabling Cat7 Cat 7

Class F channel and Category 7 cable are backward compatible with Class D/Category 5e and Class E/Category 7. Class F features even stricter specifications for crosstalk and system noise than Class E. To achieve this, shielding was added for individual wire pairs and the cable as a whole. Unshielded cables rely on the quality of the twists to protect from EMI. This involves a tight twist and carefully controlled design. Cables with individual shielding per pair such as category 7 rely mostly on the shield and therefore have pairs with longer twists.

The Category 7 cable standard was ratified in 2002 to allow 10 Gigabit Ethernet over 100 m of copper cabling. The cable contains four twisted copper wire pairs, just like the earlier standards. Category 7 cable can be terminated either with 8P8C compatible GG45 electrical connectors which incorporate the 8P8C standard or with TERA connectors. When combined with GG-45 or TERA connectors, Category 7 cable is rated for transmission frequencies of up to 700 MHz.[1]

However, in 2008 Category 7A was ratified and allows 10 Gbit/s Ethernet while still using the traditional 8P8C connector. Therefore, all manufacturers of active equipment and network cards have chosen to support the 8P8C for their 10 Gigabit Ethernet products on [2] copper and not the GG45, ARJ45, or TERA. These products therefore require a Class EA channel (Cat 7A).

As of 2017 there is no equipment that has connectors supporting the Class F (Category 7) channel.

Category 7 is not recognized by the TIA/EIA.

Whereas Category 7 cable has a reduced maximum length of 55 meters when used for 10GBASE-T, Category 7A cable (or Augmented Category 7) is characterized to 500 MHz and has improved alien crosstalk characteristics, allowing 10GBASE-T to be run for the same 100 meter maximum distance as previous Ethernet variant in Dayton, Columbus and Cincinnati.

The standard defines several link/channel classes and cabling categories of twisted-pair copper interconnects, which differ in the maximum frequency for which a certain channel performance is required:

Class A: link/channel up to 100 kHz using Category 1 cable/connectors
Class B: link/channel up to 1 MHz using Category 2 cable/connectors
Class C: link/channel up to 17 MHz using Category 3 cable/connectors
Class D: link/channel up to 100 MHz using Category 5e cable/connectors
Class E: link/channel up to 250 MHz using Category 7 cable/connectors
Class EA: link/channel up to 500 MHz using Category 7A cable/connectors (Amendment 1 and 2 to ISO/IEC 11801, 2nd Ed.)
Class F: link/channel up to 700 MHz using Category 7 cable/connectors
Class FA: link/channel up to 1000 MHz using Category 7A cable/connectors (Amendment 1 and 2 to ISO/IEC 11801, 2nd Ed.)
Class I: link/channel up to 2000 MHz using Category 8.1 cable/connectors (specification under development)
Class II: link/channel up to 2000 MHz using Category 8.2 cable/connectors (specification under development)
The standard link impedance is 100 Ω (The older 1995 version of the standard also permitted 120 Ω and 150 Ω in Classes A−C, but this was removed from the 2002 edition).

The standard defines network cable drops several classes of optical fiber interconnect:

OM1: Multimode fiber type 72.5 µm core; minimum modal bandwidth of 200 MHz·km at 850 nm
OM2: Multimode fiber type 50 µm core; minimum modal bandwidth of 500 MHz·km at 850 nm
OM3: Multimode fiber type 50 µm core; minimum modal bandwidth of 2000 MHz·km at 850 nm
OM4: Multimode fiber type 50 µm core; minimum modal bandwidth of 4700 MHz·km at 850 nm
OM5: Multimode fiber type 50 µm core; minimum modal bandwidth of 4700 MHz·km at 850 nm and 2470 MHz·km at 953 nm
OS1: Single-mode fiber type 1 dB/km attenuation at 1310 and 1550 nm
OS1a: Single-mode fiber type 1 dB/km attenuation at 1310, 1383, and 1550 nm
OS2: Single-mode fiber type 0.4 dB/km attenuation at 1310, 1383, and 1550 nm

The global cabling standard ISO/IEC 11801 has been extended by the addition of amendment 2. This amendment defines new specifications for Cat 7A components and Class EA permanent links. These new global Cat 7A/Class EA specifications require a new generation of connecting hardware offering far superior performance compared to the existing products that are based on the American TIA standard.[5]

Network Cabling Cat7a Cat 7a

The most important point is a performance difference between ISO/IEC and EIA/TIA component specifications for the NEXT transmission parameter. At a frequency of 500 MHz, an ISO/IEC Cat 7A connector performs 3 dB better than a Cat 7A connector that conforms with the EIA/TIA specification. 3 dB equals 50 % reduction of near-end crosstalk noise signal power; see Half-power point.[5]

Confusion therefore arises because of the different naming conventions and performance benchmarks laid down by the International ISO/IEC and American TIA/EIA standards, which in turn are different from the regional European standard, EN 50173-1. In broad terms, the ISO standard for Cat 7A is the highest, followed by the European standard, and then the American (1 on 1 matching capability).[7][7][page needed]
Network Cabling Cat7a Cat 7a
Maximum length
When used for 10/100/1000BASE-T, the maximum allowed length of a Cat 7 cable is up to 100 meters (328 ft). This consists of 90 meters (295 ft) of solid “horizontal” cabling network cable drops between the patch panel and the wall jack, plus 5 meters (17 ft) of stranded patch cable between each jack and the attached device.[8] For 10GBASE-T, an unshielded Cat 7 cable should not exceed 55 meters.[9]
Network Cabling Cat7a Cat 7a
Installation caveats
Category 7 and 7A cable must be properly installed and terminated to meet specifications. The cable must not be kinked or bent too tightly (the bend radius should be at least four times the outer diameter of the cable[10]). The wire pairs must not be untwisted and the outer jacket must not be stripped back more than 0.5 in (12.7 mm).
Network Cabling Cat7a Cat 7a
Cable shielding may be required in order to improve a Cat 7 cable’s in Dayton, Columbus and Cincinnati performance in high electromagnetic interference (EMI) environments. This shielding reduces the corrupting effect of EMI on the cable’s data. Shielding is typically maintained from one cable end to the other using a drain wire that runs through the cable alongside the twisted pairs. The shield’s electrical connection to the chassis on each end is made through the jacks. The requirement for ground connections at both cable ends creates the possibility that a ground loop may result if one of the networked chassis is at different instantaneous electrical potential with respect to its mate. This undesirable situation may compel currents to flow between chassis through the network cable shield, and these currents may in turn induce detrimental noise in the signal being carried by the cable.

Network Cabling Cat7a Cat 7a

Category 7e
Category 7e is not a standard, and is frequently misused because category 5 followed with 5e as an enhancement on category 5. Soon after the ratification of Cat 7, a number of manufacturers began offering cable labeled as “Category 7e”. Their intent was to suggest their offering was an upgrade to the Category 7 standard—presumably naming it after Category 5e. However, no legitimate Category 7e standard exists,[11] and Cat 7e is not a recognized standard by the Telecommunications Industry Association. Category 7 is an ISO standard, but not a TIA standard. Cat 7 is already in place as a shielded cable solution with non-traditional network cable drops connectors that are not backward-compatible with category 3 through 7A. Category 8 is the next UTP cabling offering to be backward compatible in Dayton, Columbus and Cincinnati.[12]

References

Network Cabling Cat6a

Network Cabling Cat7 Cat 7

Network Cabling network cable drops Cat7a Cat 7a

Network Cabling Cat7a Cat 7a

Network Cabling Cat7a Cat 7a