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This chapter provides the following cable assembly illustrations and pinout descriptions so you can construct your own cables.
The cables available from Cisco meet FCC part 15J Class A requirements and Verband Deutscher Electrotechniker (VDE) 0871 Limit B levels. When you construct your own cables you should refer to appropriate documentation regarding interference considerations and cable length limitations.
Use the following illustrations as a guide to creating your own cables. Each illustration includes connection tables and a list of components. Suggested sources for components are also provided.
When assembling your cable, follow these steps:
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 4-1 when assembling an RS-232 cable.
Refer to Figure 4-2 when assembling an RS-449 cable.
Refer to Figure 4-3 when assembling a V.35 cable.
Refer to Figure 4-4 when assembling an X.21 cable.
The following tables provide the pinouts and signal descriptions for the RS-232, RS-449, V.35, and X.21 cables.
Table 4-1 lists the RS-232 serial cable pinouts and signal descriptions.
Table 4-2 lists the RS-449 cable pinouts and signal descriptions.
Table 4-3 lists the V.35 cable pinouts and signal descriptions.
Table 4-4 lists the X.21 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 | -- |
| 26 | 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 |
| 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 | -- |
| 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 | -- |
| 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 | nc | Looped to pins 8, 41on 50-pin connector | |
| 8 | nc | Looped to pins 6, 41on 50-pin connector | |
| 10 | 5 | Indicate A | Input |
| 18 | 13 | Clock B | Input |
| 19 | 11 | Received Data B | Input |
| 20 | 10 | Control B | Output |
| 21 | nc | Looped to pin 27 on 50-pin connector | |
| 22 | 12 | Looped to pins 24, 25 on 50-pin connector | |
| 24 | nc | Looped to pins 22, 25 on 50-pin connector | |
| 25 | nc | Looped to pins 22, 24 on 50-pin connector | |
| 26 | 12 | Indicate B | Input |
| 27 | nc | Looped to pin 21on 50-pin connector | |
| 34 | 9 | Transmitted Data B | Output |
| 35 | 4 | Received Data A | Input |
| 36 | 8 | Signal Ground | -- |
| 37 | nc | Looped to pin 43on 50-pin connector | |
| 38 | nc | Looped to pin 5 on 50-pin connector | |
| 41 | nc | Looped to pins 6, 8 on 50-pin connector | |
| 43 | nc | Looped to pin 37 on 50-pin connector |
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