Category 6 cable

A Cat 6 ethernet cable

Category 6 cable, commonly referred to as Cat 6, is a standardized twisted pair cable for Ethernet and other network physical layers that is backward compatible with the Category 5/5e and Category 3 cable standards. Compared with Cat 5 and Cat 5e, Cat 6 features more stringent specifications for crosstalk and system noise.[1] The cable standard specifies performance of up to 250 MHz.[1]

Whereas Category 6 cable has a reduced maximum length when used for 10GBASE-T, Category 6A cable (or Augmented Category 6) is characterized to 500 MHz and has improved alien crosstalk characteristics, allowing 10GBASE-T to be run for the same 100 meter distance as previous Ethernet variants.

Description

Category 6 cable can be identified by the printing on the side of the cable sheath.[2]

Cat 6 patch cables are normally terminated in 8P8C modular connectors. If Cat 6 rated patch cables, jacks and connectors are not used with Cat 6 wiring, overall performance is degraded and may not meet Cat 6 performance specifications.[3]

Connectors use either T568A or T568B pin assignments; performance is comparable provided both ends of a cable are terminated identically.

Category 6A

The standard for Category 6A is ANSI/TIA-568-C.1, defined by the TIA for enhanced performance standards for twisted pair cable systems. It was defined in February 2009. Category 6A is defined at frequencies up to 500 MHz—twice that of Cat 6.

Category 6A performs at improved specifications, in particular in the area of alien crosstalk as compared to Cat 6 UTP (unshielded twisted pair), which exhibited high alien noise in high frequencies.

The global cabling standard ISO/IEC 11801 has been extended by the addition of amendment 2. This amendment defines new specifications for Cat 6A components and Class EA permanent links. These new global Cat 6A/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.[4]

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 6A connector performs 3 dB better than a Cat 6A connector that conforms with the EIA/TIA specification. 3 dB equals 50 % reduction of near-end crosstalk noise signal power; see 3dB-point.[4]

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 6A is the highest, followed by the European standard, and then the American (1 on 1 matching capability).[5][6]

Maximum length

When used for 10/100/1000BASE-T, the maximum allowed length of a Cat 6 cable is up to 100 meters (328 ft). This consists of 90 meters (295 ft) of solid "horizontal" cabling between the patch panel and the wall jack, plus 5 meters (16 ft) of stranded patch cable between each jack and the attached device.[7] For 10GBASE-T, an unshielded Cat 6 cable should not exceed 55 metres.[8]

Installation caveats

Category 6 and 6A 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[9]). The wire pairs must not be untwisted and the outer jacket must not be stripped back more than 0.5 in (12.7 mm).

Cable shielding may be required in order to improve a Cat 6 cable's 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.

Category 6e

Category 6e 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 6, a number of manufacturers began offering cable labeled as "Category 6e". Their intent was to suggest their offering was an upgrade to the Category 6 standard—presumably naming it after Category 5e. However, no legitimate Category 6e standard exists,[10] and Cat 6e is not a recognized standard by the Telecommunications Industry Association. Category 7 is an international ISO standard, but not a TIA standard. Cat 7 is already in place as a shielded cable solution with non-traditional connectors that are not backward-compatible with category 3 through 6A. Category 8 is the next UTP cabling offering to be backward compatible.[11]

References

  1. 1 2 Kish, Paul (July 2002). "Category 6 Cabling Questions and Answers" (PDF). NORDX/CDT, Inc. Retrieved 21 October 2013.
  2. ↑ Ethernet Cable Identification and Use Archived July 10, 2011, at the Wayback Machine.
  3. ↑ ANSI/TIA/EIA 568-B.2-1
  4. 1 2 "A new Category 6A specification has arrived". Next generation Cat. 6A. Tyco Electronics. Archived from the original on 2014-02-25.
  5. ↑ "Cat. 6A ≠ Cat. 6 A ≠ Class EA". Next generation Cat. 6A. Tyco Electronics. Archived from the original on 2013-12-03.
  6. ↑ Barnett, David; Goth, David; McBee, Jim. Cabling: The Complete Guide to Network Wiring, 3rd Edition. Sybex. ISBN 978-0782143317.
  7. ↑ Commercial Building Telecommunications Standard (PDF)
  8. ↑ "Deploying 10GBASE-T with Cisco Switches: Choose the Right Cabling".
  9. ↑ "Category 5/5E & Cat 6 Cabling Tutorial and FAQ's". LANshack.com. Retrieved 2012-01-06.
  10. ↑ Cat 6e vs Cat 6a
  11. ↑ McLaughlin, Patric (2012-12-01). "TIA working on Category 8 standard". Cabling Installation and Maintenance. 20 (12). Retrieved 2016-01-03.
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