Pinouts for RJ45 jacks (Serial and 10Base-T)


Here are 3 standards - If you don't know which one to use, then use T568B

10Base-T Wiring Chart
Pin Color Signal
1 White-Blue TD+
2 Blue TD-
3 White-Orange RD+
4 - -
5 - -
6 Orange RD-
7 - -
8 - -
T568A Wiring Chart
Pin Color Signal
1 White-Green T3
2 Green R3
3 White-Orange T2
4 Blue R1
5 White-Blue T1
6 Orange R2
7 White-Brown T4
8 Brown R3
T568B Wiring Chart
Pin Color Signal
1 White-Orange T2
2 Orange R2
3 White-Green T3
4 Blue R1
5 White-Blue T1
6 Green R3
7 White-Brown T4
8 Brown R4

A 10Base-T Cross-over swaps TD and RD. That is, swap pins 1 and 3 as well as pins 2 and 6, on one end of the cable.

AT&T 258A wiring is comparable to T568B


Serial Pinout Applications
Connector Pinout Connect to Pretend to be
DB25-M DCE Modem IBM PC 25-pin
DB25-M DTE Terminal  
DB25-F DTE IBM PC 25-pin Modem
DE9-M DCE Mouse IBM PC 9-pin
DE9-F DTE IBM PC 9-pin  

Serial Pinout Details
RJ45 Pin Wire Color   DTE   DCE
  Name DB9 DB25   Name DB9 DB25
1 blue   CTS 8 5   RTS 7 4
2 orange   DCD 1 8   DTR 4 20
3 black   TD 3 2   RD 2 3
4 red   Gnd 5 7   Gnd N/C 1
5 green   Gnd N/C 1   Gnd 5 7
6 yellow   RD 2 3   TD 3 2
7 brown   DTR 4 20   DCD 1 8
8 white   RTS 7 4   CTS 8 5

 

 

 

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