Cable Specifications

This chapter provides the following cable assembly illustrations and pinout descriptions so you can construct your own cables.

Serial port RS-232 cable
Serial port RS-449 cable
Serial port V.35 cable
Serial port X.21 cable
Ethernet (AUI) cables

The cables available from Cisco meet FCC RF and VDE emissions requirements. When you construct your own cables you should refer to appropriate documentation regarding interference considerations and cable length limitations.

Cable Assembly Drawings

Use the following illustrations as a guide to creating your own cables. Connection tables and a list of components are provided in each of the illustrations. Suggested sources for components are also provided.

When assembling your cable, follow these steps:

Procedure:

Step 1: Fold back the braided shield to make electrical and mechanical connection with the metal shell on both ends. Refer to location "A" in the appropriate illustration.

Step 2: Cut unterminated wires back, insulate or ensure insulation from other conductors.

Refer to Figure 1-1 when assembling an RS-232 cable.

Refer to Figure 1-2 when assembling an RS-449 cable.

Refer to Figure 1-3 when assembling a V.35 cable.

Refer to Figure 1-4 when assembling an X.21 cable.

Figure 1-1: RS-232 Cable Assembly

Figure 1-2: RS-449 Cable Assembly

Figure 1-3: V.35 Cable Assembly

Figure 1-4: X.21 Cable Assembly

Serial Cable Pinouts

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

Table 1-1 lists the RS-232 serial cable pinouts and signal descriptions.

Table 1-2 lists the RS-449 cable pinouts and signal descriptions.

Table 1-3 lists the V.35 cable pinouts and signal descriptions.

Table 1-4 lists the X.21 cable pinouts and signal descriptions.

Table 1-5 lists the Ethernet cable pinouts and signal descriptions.

Note In Table 1-1, any pin not referenced on a connector is not connected.

IGS Serial Port DTE RS-232 Cable Pinouts and Signal Descriptions

50 Pin	25 Pin	Signal Name	Direction
3	nc	Looped to pin 36 on 50-pin connector
9	8	Carrier Detect	Input
11	2	Transmitted Data	Output
14	9	Loopback	Output
15	1	Chassis Ground	--
42	6	Data Set Ready	Input
30	20	Data Terminal Ready	Output
31	15	Transmit Clock	Input
36	nc	Looped to pin 3 on 50-pin connector
39	5	Clear To Send	Input
40	4	Requested To Send	Output
44	7	Signal Ground	--
46	3	Received Data	Input
47	17	Receive Clock	Input

Note In Table 1-2, any pin not referenced on a connector is not connected.

IGS Serial Port DTE RS-449 Cable Pinouts and Signal Descriptions

50 Pin	37 Pin	Signal Name	Direction
1	4	Transmitted Data + (SD A)	Output
2	5	Transmit Clock + (ST A)	Input
4	7	Request To Send + (RS A)	Output
5	nc	Looped to pin 38 on 50-pin connector
6	9	Clear To Send + (CS A)	Input
7	10	Loopback (LL)	Output
8	11	Data Set Ready + (DM A)	Input
10	13	Carrier Detect + (RR A)	Input
15	1	Chassis Ground	--
18	23	Transmit Clock - (ST B)	Input
19	24	Received Data - (RD B)	Input
20	25	Request To Send - (RS B)	Output
21	26	Receive Clock - (RT B)	Input
22	27	Clear To Send - (CS B)	Input
24	29	Data Set Ready - (DM B)	Input
25	30	Data Terminal Ready - (TR B)	Output
27	35	Transmitter Signal Element Timing - (TT B)	Output
34	22	Transmitted Data - (SD B)	Output
35	6	Received Data + (RD A)	Input
36	19	Signal Ground	--
37	8	Receive Clock + (RD A)	Input
38	nc	Looped to pin 5 on 50-pin connector
41	12	Data Terminal Ready + (TR A)	Output
26	31	Carrier Detect (RR B)	Input
43	17	Transmitter Signal Element Timing + (TT A)	Output
44	37	Signal Ground	--
48	20	Signal Ground	--

Note In Table 1-3, any pin not referenced on a connector is not connected.

IGS Serial Port DTE V.35 Cable Pinouts and Signal Descriptions

50 Pin	34 Pin	Signal Name	Direction
2	Y	Transmit Clock +	Input
3	nc	Looped to pin 36 on 50-pin connector
5	nc	Looped to pin 38 on 50-pin connector
9	F	Received Line Signal Detect	Input
12	P	Transmitted Data +	Output
14	K	Loopback	Output
15	A	Chassis Ground	--
18	AA	Transmit Clock -	Input
19	T	Received Data -	Input
21	X	Receive Clock -	Input
42	E	Data Set Ready	Input
28	S	Transmitted Data -	Output
29	W	Transmitter Signal Element Timing -	Output
30	H	Data Terminal Ready	Output
35	R	Received Data +	Input
36	nc	Looped to Pin 3 on 50-pin connector
37	V	Receive Clock +	Input
38	nc	Looped to pin 5 on 50-pin connector
39	D	Clear To Send	Input
40	C	Request To Send	Output
45	U	Transmitter Signal Element Timing -	Output
48	B	Signal Ground	--

Note In Table 1-4, any pin not referenced on a connector is not connected.

IGS Serial Port DTE X.21 Cable Pinouts and Signal Descriptions

50 Pin	15 Pin	Signal Name	Direction
1	2	Transmitted Data A	Output
2	6	Clock A	Input
4	3	Control A	Output
5	nc	Looped to pin 38 on 50-pin connector
6	5	Indicate A	Input
8	5	Indicate A	Input
10	5	Indicate A	Input
18	13	Clock B	Input
19	11	Received Data B	Input
20	10	Control B	Output
21	13	Clock B	Input
22	12	Indicate B	Input
24	12	Indicate B	Input
34	9	Transmitted Data B	Output
35	4	Received Data A	Input
36	8	Signal Ground	--
37	6	Clock A	Input
38	nc	Looped to pin 5 on 50-pin connector
26	12	Indicate B	Input

Ethernet Cable Pinouts

Note In Table 1-5, any pin not referenced on a connector is not connected.

IGS Ethernet Pinouts and Signal Descriptions

Pin Number	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 (Jumper L24 and M24)
5	DI-A	Data In Circuit A
12	DI-B	Data In Circuit B
4	DI-S	Data In Circuit Shield (Jumper L23 and M23)
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

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