USOC Configurations

Universal Service Ordering Codes (USOC) are a series of Registered Jack (RJ) wiring configurations developed by the Bell System for connection of customer premise equipment to the public network. FCC regulations control the application of these configurations when used for this purpose.

USOC RJ61	USOC RJ25
USOC RJ14	USOC RJ11
USOC RJ31X	USOC RJ48X
USOC RJ48S	USOC RJ45S

 

COLOR CODING

 

 

TIA/EIA-568-A Configurations

Two standards were adopted. Both utilize pin/pair assignments that provide superior transmission performance over other 4-pair wiring configurations.

T568A	T568B
Preferred method Directly compatible with 2-pair voice and Token Ring systems utilizing 6-position connectors.	Optional method AT&T's standard Directly compatible with AT&T phone systems

LAN Configurations

Local Area Network Standards designed to operate over UTP designate pin/pair assignments on modular connectors for signal transmission. While the TIA/EIA configurations (T568A and T568B) support all of these designations, there are some cases where the user chooses to cable only the number of pairs required to support the application. For additional information regarding these applications, please refer to our Telecommunications Systems.

10BASE-T (IEEE 802.3)	Token Ring (IEEE 802.5)	TP-PMD (ANSI X3T9.5)
10 Mbps Ethernet over UTP	4/16 Mbps Token Ring over copper	100 Mbps FDDI over copper (pending)