1.0 Standard EIA/TIA 568
The ANSI/EIA/TIA-568-1991 Standard _Commercial Building
Telecommunications Wiring Standard_ defines pinouts;
1.1 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
1.2 Standard EIA/TIA T568B
(also called AT&T specification, previously called 258A)
/--T2 1 White/Orange
/
pair 2 \
\--R2 2 Orange
/-----------T3 3 White/Green
/
/ /---R1 4 Blue
pair3 \ pair 1 \---T1 5 White/Blue
\
\-----------R3 6 Green
/--T4 7 White/Brown
/
pair 4
\
\--R4 8 Brown
1.3 USOC (Universal Service Order Code)
8 pins 6 pins Color
/-------------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
2.0 Plugs and 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 |
|__ __|/ |/_ /_|
|____| |/___|
3.0 Standard Networking Configurations
With reference to T568B above;
ATM 155Mbps uses pairs 2 and 4 (pins 1-2, 7-8)
Ethernet 10Base-T uses pairs 2 and 3 (pins 1-2, 3-6)
Ethernet 100Base-T4 uses pairs 2 and 3 (4T+) (pins 1-2, 3-6)
Ethernet 100Base-T8 uses pairs 1,2,3 and 4 (pins 4-5, 1-2, 3-6, 7-8)
Token-Ring uses pairs 1 and 3 (pins 4-5, 3-6)
TP-PMD uses pairs 2 and 4 (pins 1-2, 7-8)
100VG-AnyLAN uses pairs 1,2,3 and 4 (pins 4-5, 1-2, 3-6, 7-8)
4.0 Ethernet 10Base-T Cabling
4.1 Ethernet 10Base-T Straight Thru patch cord (T568B colors)
RJ45 Plug RJ45 Plug
========= =========
/---------T2 1 ... White/Orange .... 1 TxData +
pair2
\---------R2 2 ... Orange .......... 2 TxData -
/---------T3 3 ... White/Green ..... 3 RecvData +
/
/ / R1 4 Blue 4
pair 3 pair 1
\ \ T1 5 White/Blue 5
\
\---------R3 6 ... Green ........... 6 RecvData -
/ T4 7 White/Brown 7
pair 4
\ R4 8 Brown 8
4.2 Ethernet 10Base-T Crossover patch cord
This cable can be used to cascade hubs, or for connecting two Ethernet stations
back-to-back without a hub (ideal for two station Doom!) Note pin numbering in item 10.0 above.
RJ45 Plug 1 Tx+ -------------- Rx+ 3 RJ45 Plug
2 Tx- -------------- Rx- 6
3 Rx+ -------------- Tx+ 1
6 Rx- -------------- Tx- 2
4.3 Ethernet 10Base-T to USOC Crossover patch cord;
RJ45 8-pin Plug 1 ---White/Orange--- 2 USOC 6-pin Plug
2 ------Orange------ 5
3 ---White/Green---- 1
6 ------Green------- 6
4.4 Crossover Implementation
A simple
way to make a crossover patch cable is to take a dual-jack surface mount box and make the crossover
between the two jacks. This allows using standard patch cables, and avoids the nuisance of having a
crossover cable find its way into use in place of a regular patch cable.
4.5 Stranded Patch Cables
The color code used in stranded patch cables is different from
solid-conductor cables. For NorTel Digital Patch Cable (DPC), the coding is.
Pair 1: Green & Red
Pair 2: Yellow & Black
Pair 3: Blue & Orange
Pair 4: Brown & Gray |
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