V.35 Link Pinouts
The connector pinouts described here correspond to the connector labeled “V.35” on the back of the P1705 & P1730.
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| 13 | 1 |
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| 25 | 14 |
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DB25 | M.34 |
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Contact | Contact |
| Circuit | To | From |
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Number | Number |
| Name | DCE | DCE |
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1 | A |
| Protective Ground | NA |
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2 |
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3 |
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4 | C |
| Request to Send | X |
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5 |
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6 | E |
| Data Set Ready |
| X | |
7 | B |
| Signal Ground | NA | ||
8 | F | Data Channel Received Line Signal Detector |
| X | ||
9 | P |
| Transmitted Data (A) | X |
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10 | S |
| Transmitted Data (B) | X |
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11 | R |
| Received Data (A) |
| X | |
12 | T |
| Received Data (B) |
| X | |
13 |
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14 | V | Receiver Signal Element Timing (A) |
| X | ||
15 |
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16 | X | Receiver Signal Element Timing (B) |
| X | ||
17 |
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18 | U | Transmitter Signal Element Timing (A) DTE | X |
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19 | W | Transmitter Signal Element Timing (B) DTE | X |
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20 | H |
| Data Terminal Ready | X |
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21 |
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| Local Loopback | X |
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22 | J |
| Calling Indicator |
| X | |
23 | Y | Transmitter Signal Element Timing (A) |
| X | ||
24 |
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25 | a | Transmitter Signal Element Timing (B) |
| X | ||
Figure D - 8 V.35 Link Pin Outs
The connecting cable must be a shielded cable.
Circuits which are paired (contain an (A) and (B) reference) should be connected to twisted pairs within the connecting cable.
NOTE For U.K. Approval:
The connecting cable may be any length between 0 and 5M. One end must be terminated in a male 34 pin X.21 bis connector as defined in