E. Connectors, Cables, and Pin Assignments9128-A2-GB20-80 September 2002 E-9Cisco 7000 Series Router – DB25 Plug3COM Router – DB9 SocketCOM PortDirectionAUX PortSignal RJ45 Pin # DB25 Pin # SignalDCE 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 TerminalReady (DTR)5 To DTE 20 DTE Data TerminalReady (DTR)DCE Carrier Detect(CD)6 To DTE 8 DTE Carrier Detect(CD)DCE Request toSend (RTS)7 To DTE 4 DTE Request toSend (RTS)COM PortDirectionAUX PortSignal RJ45 Pin # DB25 Pin # SignalDCE 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 TerminalReady (DTR)5 To DTE 4 DTE Data TerminalReady (DTR)DCE Carrier Detect(CD)6 To DTE 1 DTE Carrier Detect(CD)DCE Request toSend (RTS)7 To DTE 7 DTE Request toSend (RTS)
