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Home > Do it Yourself Resources > DIY Resources > Cables & Cabling Standards > Standard EIA /TIA 568 A EIA /TIA 568 B, USOC, RJ45 Pinout Wiring Diagram

Standard EIA /TIA 568 A EIA /TIA 568 B, USOC, RJ45 Pinout Wiring Diagram

The ANSI/EIA/TIA-568-1991 Standard _Commercial Building Telecommunications Wiring Standard_ defines pinouts;

9.1 Standard EIA/TIA T568A (also called ISDN, previously called EIA)

Pin Wire Color === ========== /--T3 1 White/Green Pair3 \--R3 2 Green /----------T2 3 White/Orange / /-R1 4 Blue pair2 \ pair1 \-T1 5 White/Blue \----------R2 6 Orange /--T4 7 White/Brown pair4 \--R4 8 Brown

9.2 Standard EIA/TIA T568B (also called AT&T specification, previously called 258A)

/--T2 1 White/Orange pair2 \--R2 2 Orange /----------T3 3 White/Green / /-R1 4 Blue pair3 \ pair1 \-T1 5 White/Blue \----------R3 6 Green /--T4 7 White/Brown pair4 \--R4 8 Brown

9.3 USOC (Universal Service Order Code)

8-pins 6-pins | | /-------------T4 1 White/Brown / /---------T3 2 1 White/Green / / /-----T2 3 2 White/Orange / / / /-R1 4 3 Blue pr4\ pr3\ pr2\ pr1\-T1 5 4 White/Blue \ \ \-----R2 6 5 Orange \ \---------R3 7 6 Green \-------------R4 8 Brown


Subject: 10.0 Birds and Bees (Plugs vs. Jacks)

The EIA/TIA specifies an RJ-45 (ISO 8877) connector for Unshielded Twisted Pair (UTP) cable. The plug is the male component crimped on the end of the cable while the jack is the female component in a wall plate or patch panel, etc. Here is the pin numbering to answer the question, where is pin one?

Plug Jack (Looking at connector (Looking at cavity end with the cable in the wall) running away from you)

---------- / ---------- | 87654321 | | 12345678 | |__ __|/ |/_ /_| |____| |/___|

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