Google Translate

Worldwide | United States/Canada

Common Outlet Configurations

Two wiring schemes have been adopted by the '568-B.1 and '11801:2002 standards. They are nearly identical except that pairs two and three are reversed. T568A is the preferred scheme because it is compatible with 1 or 2-pair USOC systems. Either configuration can be used for Integrated Services Digital Network (ISDN) and high speed data applications. Transmission categories 3, 5e, and 6 are only applicable to this type of pair grouping.

USOC wiring is available for 1-, 2-, 3-, or 4-pair systems. Pair 1 occupies the center conductors, pair 2 occupies the next two contacts out, etc. One advantage to this scheme is that a 6-position plug configured with 1, 2, or 3 pairs can be inserted into an 8-position jack and still maintain pair continuity. A note of warning though, pins 1 and 8 on the jack may become damaged from this practice. A disadvantage is the poor transmission performance associated with this type of pair sequence. None of these pair schemes is cabling standard compliant.

10BASE-T and 100BASE-TX wiring specifies an 8-position jack but uses only two pairs. These are pairs two and three of T568A and T568B schemes.

1000BASE-T and 10GBASE-T wiring specifies an 8-position jack. Can be either the T568A or T568B configuration. (See above)

Token Ring wiring uses either an 8-position or 6-position jack. The 8-position format is compatible with T568A, T568B, and USOC wiring schemes. The 6-position is compatible with 1- or 2-pair USOC wiring.

ANSI X3T9.5 TP-PMD uses the two outer pairs of an 8-position jack. These positions are designated as pair 3 and pair 4 of the T568A wiring scheme. This wiring scheme is also used for ATM.

Share This

Need Help?

Ask Siemon

866-548-5814 (US)
8am-6:30pm EST (»Worldwide)

Follow Siemon

Siemon RSS Siemon on Facebook Siemon on Twitter Siemon on YouTube Siemon on Flickr Siemon on LinkedIn

White Paper: Optical Fiber Transmission, Media, and Applications

White Paper: Advantages of Using Siemon Shielded Cablings Systems to Power Remote Network Devices

LC BladePatch high density fiber for data centers
Cisco and Siemon

Cisco Technology Developer Partner

See Siemon in Cisco Marketplace: