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8 pin RJ45 (8P8C) male connector layout
8 pin RJ45 (8P8C) male connector
Cisco / Juniper / Zyxel / Ubiquiti network devices with RJ45 console ports

Network devices with RJ45 console ports typically follow the Cisco pin out. The pinout below shows a null modem wiring between the RJ45 and the DB9 female connector. This is known to work on Cisco, Juniper, Zyxel and Ubiquiti Edge series devices with RJ45 console ports. If you are using UTP network cable then colour coding

 

RJ45 Pin
Number
RJ45 Pin
Name
DB9 Pin Number DB9 Pin Name Description

TIA/EIA
568A

TIA/EIA
568B
1 RTS

8

CTS Request To Send -> Clear To Send Orange/White Green/White
2 DTR 6 DSR Data Terminal Ready -> Data Set Ready Orange Grn
3 TXD 2 RXD Transmit Data -> Receive Data Green/White Orange/White
4 GND 5 GND Ground Blue Blue
5 GND 5   (tie pins 4/5 on RJ45 to Pin 5 on DB9 Blue/White Blue/White
6 RXD 3 TXD Receive Data <- Transmit Data Green Orange
7 DSR 4 DTR Data Set Ready -> Data Terminal Ready Brown/White Brown/White
8 CTS 7 RTS Clear To Send <- Request to Send Brown Brown
    9 RI Ring Indicator (not used)    

A simplified version of this NULL modem cable would only connect RXD, TXD and GND (this sacrifices flow control for simplicity). For other variations on null modem cables see this page

RJ45 Pin
Number
RJ45 Pin
Name
DB9 Pin Number DB9 Pin Name Description

TIA/EIA
568A

TIA/EIA
568B
3 TXD 2 RXD Transmit Data -> Receive Data Green/White Orange/White
5 GND 5 GND Ground Blue/White Blue/White
6 RXD 3 TXD Receive Data <- Transmit Data Green Orange
9 pin D-SUB female connector layout
9 pin D-SUB female connector
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Cisco/Juniper/Zyxel RJ45 Serial Console port to DB9 female visual pinout:click to enlarge
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