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E. Connectors, Cables, and Pin Assignments
9128-A2-GB20-80 September 2002
E-9
Cisco 7000 Series Router – DB25 Plug
3COM Router – DB9 Socket
COM Port
Direction
AUX Port
Signal RJ45 Pin # DB25 Pin # Signal
DCE Receive Data
(RXD)
2 From DTE 3 DTE Receive Data
(RXD)
DCE Signal Ground
(SG)
3 — 7 DTE Signal Ground
(SG)
DCE Transmit Data
(TXD)
4 To DTE 2 DTE Transmit Data
(TXD)
DCE Data Terminal
Ready (DTR)
5 To DTE 20 DTE Data Terminal
Ready (DTR)
DCE Carrier Detect
(CD)
6 To DTE 8 DTE Carrier Detect
(CD)
DCE Request to
Send (RTS)
7 To DTE 4 DTE Request to
Send (RTS)
COM Port
Direction
AUX Port
Signal RJ45 Pin # DB25 Pin # Signal
DCE Receive Data
(RXD)
2 From DTE 2 DTE Receive Data
(RXD)
DCE Signal Ground
(SG)
3 — 5 DTE Signal Ground
(SG)
DCE Transmit Data
(TXD)
4 To DTE 3 DTE Transmit Data
(TXD)
DCE Data Terminal
Ready (DTR)
5 To DTE 4 DTE Data Terminal
Ready (DTR)
DCE Carrier Detect
(CD)
6 To DTE 1 DTE Carrier Detect
(CD)
DCE Request to
Send (RTS)
7 To DTE 7 DTE Request to
Send (RTS)