Paradyne CSU, DSU, 9126-II, 9128-II COM Port AUX Port Signal RJ45 Pin # Direction DB25 Pin #

E. Connectors, Cables, and Pin Assignments

Cisco 7000 Series Router – DB25 Plug

COM Port				AUX Port
Signal	RJ45 Pin #	Direction	DB25 Pin #		Signal
DCE Receive Data	2	From DTE	3		DTE Receive Data
(RXD)					(RXD)
DCE Signal Ground	3	—	7		DTE Signal Ground
(SG)					(SG)
DCE Transmit Data	4	To DTE	2		DTE Transmit Data
(TXD)					(TXD)
DCE Data Terminal	5	To DTE	20		DTE Data Terminal
Ready (DTR)					Ready (DTR)
DCE Carrier Detect	6	To DTE	8		DTE Carrier Detect
(CD)					(CD)
DCE Request to	7	To DTE	4		DTE Request to
Send (RTS)					Send (RTS)
3COM Router – DB9 Socket
COM Port				AUX Port
Signal	RJ45 Pin #	Direction	DB25 Pin #		Signal
DCE Receive Data	2	From DTE	2		DTE Receive Data
(RXD)					(RXD)
DCE Signal Ground	3	—	5		DTE Signal Ground
(SG)					(SG)
DCE Transmit Data	4	To DTE	3		DTE Transmit Data
(TXD)					(TXD)
DCE Data Terminal	5	To DTE	4		DTE Data Terminal
Ready (DTR)					Ready (DTR)
DCE Carrier Detect	6	To DTE	1		DTE Carrier Detect
(CD)					(CD)
DCE Request to	7	To DTE	7		DTE Request to
Send (RTS)					Send (RTS)

9128-A2-GB20-80 September 2002 E-9