Assembling Your Own Cables
RS-232 Console and Auxiliary Port Signals and Pinouts
Serial Cable Pinouts
Ethernet Cable Assembly
Token Ring Port Pinout

Cabling Specifications

This appendix provides the following pinouts for constructing your own cables:

• RS-232 console cable
  
  
• RS-232 auxiliary cable
  
  
• Serial DTE and DCE RS-232 cable
  
  
• Serial DTE and DCE RS-449 cable
  
  
• Serial DTE and DCE V.35 cable
  
  
• Serial DTE and DCE X.21 cable
  
  
• Serial DTE EIA-530 cable
  
  
• BRI port pinout
  
  
• Ethernet (AUI) cable
  
  
• Token Ring port for 3202
  
  
• Token Ring port for 3204
  
  

The cables available from Cisco meet FCC part 15J Class A requirements and Verband Deutscher Electrotechniker (VDE) 0871 Limit B levels. When constructing your own cables, refer to the appropriate documentation regarding interference considerations and cable length limitations.

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Note Only models 3104 and 3204 support data communications equipment (DCE) connections. All other models support only data terminal equipment (DTE) connections.

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Assembling Your Own Cables

When assembling your own cables, follow these steps:

Step 1 Fold back the braided shield to make electrical and mechanical connection with the metal shell on both ends.

Step 2 Cut unterminated wires back. Insulate or ensure insulation from other conductors.

Step 3 Use the following illustrations and connection tables as a guide to making your own cables:

• When assembling an RS-232 console cable, refer to Table A-1.
  
  
• When assembling an RS-232 auxiliary cable, refer to Table A-2.
  
  
• When assembling an RS-232 cable, refer to Figure A-1, Table A-3, and Table A-4.
  
  
• When assembling an RS-449 cable, refer to Figure A-2, Table A-5, and Table A-6.
  
  
• When assembling a V.35 cable, refer to Figure A-3, Table A-7, and Table A-8.
  
  
• When assembling an X.21 cable, refer to Figure A-5, Table A-9, and Table A-9.
  
  
• When assembling an EIA-530 cable, refer to Figure A-6 and Table A-11.
  
  
• When assembling an Ethernet (AUI) cable, refer to Figure A-7 and Table A-12.
  
  
• When assembling a Token Ring cable, refer to Table A-13 and Table A-14.
  
  

RS-232 Console and Auxiliary Port Signals and Pinouts

Refer to Table A-1 when assembling an RS-232 console cable, and refer to Table A-2 when assembling an RS-232 auxiliary port cable.

Console Port RS-232 Pinouts and Signals (25-Pin D Connector)

Pin1	Signal Name	Direction
1	Frame Ground	-
2	Transmitted Data	Input
3	Received Data	Output
4	Request To Send	Shorted together internally with Pin 5
5	Clear To Send	-
6	Shorted to Pin 8	Output
7	Ground	-
8	Carrier Detect	Output
20	Data Terminal Ready	Input

Auxiliary Port RS-232 Pinouts and Signals (25-Pin D Connector)

Pin2	Signal Name	Direction
1	Frame Ground	-
2	Transmitted Data	Output
3	Received Data	Input
4	Request To Send	Output
5	Clear To Send	Input
7	Ground	-
8	Carrier Detect	Input
20	Data Terminal Ready	Output
22	Ring Indicator	Input

Serial Cable Pinouts

The following illustrations and tables provide the pinouts and signal descriptions for the RS-232,
RS-449, V.35, X.21, and EIA-530 DTE and DCE cables.

RS-232 Cable Assembly

Figure A-1 shows the RS-232 cable assembly. Table A-3 lists the DTE cable pinouts, and
Table A-4 lists the DCE cable pinouts and signal descriptions.

Figure A-1: RS-232 Cable Assembly
RS-232 DTE Serial Cable Pinouts Descriptions

72-0670-01 Connections3
50 Pin	25 Pin	Type
J1-3	J1-36
J1-39 J1-40	J2-5 J2-4	Twisted Pair
J1-9 J1-42	J2-8 J2-6	Twisted Pair
J1-11 J1-44	J2-2 J2-7	Twisted Pair
J1-46 J1-30	J2-3 J2-20	Twisted Pair
J1-14 J1-47	J2-18 J2-17	Twisted Pair
J1-31 J1-15	J2-15 J2-1	Twisted Pair
J1-16	J2-24	Twisted Pair

RS-232 DCE Serial Cable Pinouts and Signal Descriptions

72-0736-01 Connections4
50 Pin	25 Pin	Signal	Type
J1-3	J1-36	MUX
J1-47 J1-17	J2-24 J1-38	SCTE DCE	Twisted Pair
J1-40 J1-39	J2-5 J2-4	CTS RTS	Twisted Pair
J1-14 J1-30	J2-8 J2-6	DCD DSR	Twisted Pair
J1-46 J1-44	J2-2 J2-7	TXD GND	Twisted Pair
J1-11 J1-42	J2-3 J2-20	RXD DTR	Twisted Pair
J1-9 J1-23	J2-18 J2-17	LTST RXC	Twisted Pair
J1-16 J1-15	J2-15 J2-1	TXC Chassis Ground	Twisted Pair

RS-449 Cable Assembly

Figure A-2 shows the RS-449 cable assembly. Table A-5 lists the DTE cable pinouts, and
Table A-6 lists the DCE serial cable pinouts and signal descriptions.

Figure A-2: RS-449 Cable Assembly
RS-449 DTE Serial Cable Pinouts

72-0672-01 Connection Table
50 Pin1	37 Pin	Type
J1-5	J1-38
J1-7	J2-10
J1-1 J1-34	J2-4 J2-22	Twisted Pair
J1-2 J1-18	J2-5 J2-23	Twisted Pair
J1-35 J1-19	J2-6 J2-24	Twisted Pair
J1-4 J1-20	J2-7 J2-25	Twisted Pair
J1-37 J1-21	J2-8 J2-26	Twisted Pair
J1-22 J1-6	J2-27 J2-9	Twisted Pair
J1-8 J1-24	J2-11 J2-29	Twisted Pair
J1-41 J1-25	J2-12 J2-30	Twisted Pair
J1-10 J1-26	J2-13 J2-31	Twisted Pair
J1-43 J1-27	J2-17 J2-35	Twisted Pair
J1-36 J1-15	J2-19 J2-1	Twisted Pair
J1-44 J1-48	J2-37 J2-20	Twisted Pair

RS-449 DCE Serial Cable Pinouts and Signal Descriptions

72-0738-01 Connection Table
50 Pin1	37 Pin	Type	Signal Name
J1-5	J1-38		MUX
J1-13	J2-10		LL
J1-35 J1-19	J2-4 J2-22	Twisted Pair	TXD+ TXD-
J1-43 J1-27	J2-5 J2-23	Twisted Pair	SCT+ SCT-
J1-1 J1-34	J2-6 J2-24	Twisted Pair	RXD+ RXD-
J1-6 J1-22	J2-7 J2-25	Twisted Pair	RTS+ RTS-
J1-49 J1-50	J2-8 J2-26	Twisted Pair	SCR+ SCR-
J1-17	J1-44		DCE
J1-20 J1-4	J2-27 J2-9	Twisted Pair	CTS- CTS+
J1-41 J1-25	J2-11 J2-29	Twisted Pair	DSR+ DSR-
J1-8 J1-24	J2-12 J2-30	Twisted Pair	DTR+ DTR-
J1-10 J1-26	J2-13 J2-31	Twisted Pair	RLSD+ RLSD-
J1-37 J1-21	J2-17 J2-35	Twisted Pair	SCTE+ SCTE-
J1-36 J1-15	J2-19 J2-1	Twisted Pair	Ground Chassis Ground
J1-44 J1-48	J2-37 J2-20	Twisted Pair	Ground Ground

V.35 Cable Assembly

Figure A-3 shows the V.35 cable assembly with the resistor (301 ohms, 1/4 watt, ±1%), and Table A-7 and Table A-8 list the V.35 cable pinouts and signal descriptions.

Figure A-3: V.35 Cable Assembly
V.35 DTE Serial Cable Pinouts and Signal Descriptions

72-0671-02 Connections
50 Pin1	34 Pin	Type	Signal	Direction
J1-3	J1-36	Jumper	MUX	To Ground
J1-5	J1-38	Jumper	MUX	To Ground
J1-14 J1-Shield	J2-K J2-Shield	Twisted Pair	LTST Not Used
J1-2 J1-18	J2-Y J2-AA	Twisted Pair	SCT+ SCT-
J1-12 J1-28	J2-P J2-S	Twisted Pair	TXD+ TXD-
J1-35 J1-19	J2-R J2-T	Twisted Pair	RXD+ RXD-
J1-37 J1-21	J2-V J2-X	Twisted Pair	SCR+ SCR-
J1-45 J1-29	J2-U J2-W	Twisted Pair	SCTE+ SCTE-
J1-42 J1-Shield	J2-E J2-Shield	Twisted Pair	DSR Not Used
J1-9 J1-48	J2-F J2-A	Twisted Pair	RLSD Ground
J1-40 J1-Shield	J2-C J2-Shield	Twisted Pair	RTS Not Used
J1-2 J1-18	J1-3 J1-5	Resistor Resistor	SCT+ SCT-	R To Ground
J1-352 J1-19	J1-36 J1-38	Resistor Resistor	RXD+ RXD-	R To Ground
J1-37 J1-21	J1-44 J1-48	Resistor Resistor	SCR+ SCR-	R To Ground
J1-30 J1-44	J2-H J2-B	Twisted Pair	DTR Ground
J1-39 J1-Shield	J2-D J2-Shield	Twisted Pair	CTS Not Used
J1-Shield J1-Shield	J2-Shield J2-Shield	Twisted Pair	Not Used Not Used
J1-Shield	J2-Shield	Single	Not Used

V.35 DCE Serial Cable Pinouts and Signal Descriptions

72-0740-02 Connections
50 Pin1	34 Pin	Type	Signal Name	Direction
J1-3	J1-36	Jumper	MUX	To Ground
J1-5	J1-38	Jumper	MUX	To Ground
J1-9 J1-Shield	J2-K J2-Sheild	Twisted Pair	LTST
J1-45 J1-29	J2-Y J2-AA	Twisted Pair	SCT+ SCT-
J1-35 J1-19	J2-P J2-S	Twisted Pair	TXD+ TXD-
J1-12 J1-28	J2-R J2-T	Twisted Pair	RXD + RXD-
J1-32 J1-33	J2-V J2-X	Twisted Pair	SCR+ SCR-
J1-37 J1-21	J2-U J2-W	Twisted Pair	SCTE+ SCTE-
J1-30 J1-Shield	J2-E J2-Shield	Twisted Pair	DSR
J1-14 J1-48	J2-F J2-A	Twisted Pair	RLSD Ground
J1-39 J1-Shield	J2-C J2-Shield	Twisted Pair	RTS Not Used
J1-17	J1-5	Jumper	DCE Mode	To Ground
J1-Shield	J2-Shield	Single	Not Used
J1-352 J1-19	J1-36 J1-38	Resistor Resistor	TXD+ TXD-	R To Ground
J1-37 J1-21	J1-44 J1-48	Resistor Resistor	SCTE+ SCTE-	R To Ground
J1-42 J1-44	J2-H J2-B	Twisted Pair	DTR Ground
J1-40 J1-Shield	J2-D J2-Shield	Twisted Pair	CTS Not Used
J1-Shield J1-Shield	J2-Shield J2-Shield	Twisted Pair

If the router's serial port is labeled with V2, as shown in Figure A-4, then for optimum performance, use the version of the cable with the part number in -02 (for example, 72-0671-02 [DTE]).

Figure A-4: Serial Port Labeled V2

X.21 Cable Assembly

Figure A-5 shows the X.21 cable assembly, and Table A-9 and Table A-9 list the cable pinouts and signal descriptions.

Figure A-5: X.21 Cable Assembly
X.21 DTE Serial Cable Pinouts and Signal Descriptions

72-0683-02 Connections5
From	Signal	Type	To	Signal
J1-5	MUX SEL		J1-38	GND
J1-36	449 GND		J2-8	X.21 GND
J1-41 J1-25	449 DTR	Jumper	J1-6 J1-22	449 CTS
J1-41 J1-25	449 DTR	Jumper	J1-8 J1-24	449 DSR
J1-43 J1-27	449 SCTE	Jumper	J1-37 J1-21	449 SCR
J1-1 J1-34	449 TXD	Twisted Pair	J2-2 J2-9	X.21 TXD
J1-4 J1-20	449 RTS	Twisted Pair	J2-3 J2-10	X.21 CTL
J1-35 J1-19	449 RXD	Twisted Pair	J2-4 J2-11	X.21 RXD
J1-10 J1-26	449 RLSD	Twisted Pair	J2-5 J2-12	X.21 IND
J1-2 J1-18	449 SCT	Twisted Pair	J2-6 J2-13	X.21 CLK

X.21 DCE Serial Cable Pinouts and Signal Descriptions

72-0737-01 Connections6
From	Signal	Type	To	Signal
J1-5	MUX SEL		J1-38	GND
J1-36	449 GND		J2-8	X.21 GND
J1-41 J1-25	449 DSR	Jumper	J1-8 J1-24	449 DTR
J1-35 J1-19	449 TXD	Twisted Pair	J2-2 J2-9	X.21 TXD
J1-6 J1-22	449-RTS	Twisted Pair	J2-3 J2-10	X.21 CTL
J1-1 J1-34	449 RXD	Twisted Pair	J2-4 J2-11	X.21 RXD
J1-10 J1-26	449 RLSD	Twisted Pair	J2-5 J2-12	X.21 IND
J1-43 J1-27	449 SCT	Twisted Pair	J2-6 J2-13	X.21 CLK
J1-17	DCE SEL		J1-44
J1-15	Chassis GND		J2-1

EIA-530 Cable Assembly

Figure A-6 shows the EIA-530 serial cable assembly, and Table A-11 lists the pinouts and signal descriptions.

Figure A-6: EIA-530 Cable Assembly
EIA-530 DTE Serial Cable Pinouts and Signal Descriptions

72-0732-01 Connections
50 Pin1	Signal Name	Direction	25 Pin	Type
J1-5 J1-38	Looped		NC	Jumper
J1-1 J1-34	TXD + TXD -		J2-2 J2-14	Twisted Pair
J1-35 J1-19	RXD + RXD -		J2-3 J2-16	Twisted Pair
J1-4 J1-20	RTS + RTS -		J2-4 J2-19	Twisted Pair
J1-6 J1-22	CTS + CTS -		J2-5 J2-13	Twisted Pair
J1-10 J1-26	RLSD + (RR +) RLSD - (RR -)		J2-8 J2-10	Twisted Pair
J1-2 J1-18	SCT + SCT -		J2-15 J2-12	Twisted Pair
J1-37 J1-21	SCR + SCR -		J2-17 J2-9	Twisted Pair
J1-43 J1-27	SCTE + (TT +) SCTE - (TT -)		J2-24 J2-11	Twisted Pair
J1-7	LL		J2-18	Twisted Pair
J1-48 J1-36	Ground		J2-23 J2-7	Twisted Pair
J1-15	Shield		J2-1	Single Wire
J1-8 J1-24	DCE Ready Ground		J2-6 J2-23	Twisted Pair
J1-41	DTE Ready		J2-20	Twisted Pair

BRI Port Pinout (RJ-45)

The following table provides theBRI port pinout.

Table A-12 BRI Port Pinout (RJ-45)

8 Pin7	TE1	NT2	Polarity
3	Transmit	Receive	+
4	Receive	Transmit	+
5	Receive	Transmit	-
6	Transmit	Receive	-

Ethernet Cable Assembly

Figure A-7 shows the Ethernet (AUI) cable assembly, and Table A-12 lists the cable pinouts and signal descriptions.

Figure A-7: Ethernet (AUI) Cable Assembly
Ethernet (AUI) Pinouts and Signal Descriptions

Pin8	Ethernet Circuit	Signal Name
3	DO-A	Data Out Circuit A
10	DO-B	Data Out Circuit B
11	DO-S	Data Out Circuit Shield
5	DI-A	Data In Circuit A
12	DI-B	Data In Circuit B
4	DI-S	Data In Circuit Shield p
7	CO-A	Control Out Circuit A (not connected)
15	CO-B	Control Out Circuit B (not connected)
8	CO-S	Control Out Circuit Shield (not connected)
2	CI-A	Control In Circuit A
9	CI-B	Control In Circuit B
1	CI-S	Control In Circuit Shield
6	VC	Voltage Common
13	VP	Voltage Plus
14	VS	Voltage Shield (L25 and M25)
Shell	PG	Protective Ground

Token Ring Port Pinout

The following tables provide the Token Ring port pinouts for models 3202 and 3204:

Model 3202 Token Ring Port Pinout (DB-9)

9-Pin	Signal
1	-RX
2	NC1
3	NC
4	NC
5	-TX
6	+RX
7	NC
8	NC
9	+TX

Model 3204 Token Ring Port Pinout (DB-9)

9-Pin	Signal
1	-RX
2	GND
3	NC1
4	GND
5	-TX
6	+RX
7	GND
8	GND
9	+TX

¹ Any pin not referenced on a connector is not connected.
² &&Center&&Any pin not referenced on a connector is not connected.
³ &&Center&&Any pin not referenced on a connector is not connected.
⁴ &&Center&&Any pin not referenced on a connector is not connected.
⁵ Any pin not referenced on a connector is not connected.
⁶ Any pin not referenced on a connector is not connected.
⁷ Any pin not referenced is not connected.
⁸ &&Center&&Any pin not referenced on a connector is not connected.