V.11/X.21 Link Pinouts
The connector shown here and pinouts described here correspond to the connector labeled “V.11/x.21” on the back of the P1705 & P1730.
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| 8 | 1 |
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| DB15 Female DTE |
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| 15 | 9 |
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| X.21 |
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| Direction | ||
Contact | Circuits | Circuit |
| To | From | |
Number | Reference | Name |
| DCE |
| DCE |
1 |
| Protective Ground |
| NA | ||
2 | T (A) | Transmitted Data (A) |
| X |
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3 | C (A) | Control (A) |
| X |
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4 | R (A) | Received Data (A) |
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| X |
5 | I (A) | Indication (A) |
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| X |
6 | S (A) | Signal Element Timing (A) |
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| X |
7 |
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8 | Ground | Signal Ground |
| NA | ||
9 | T (B) | Transmitted Data (B) |
| X |
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10 | C (B) | Control (B) |
| X |
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11 | R (B) | Received Data (B) |
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| X |
12 | I (B) | Indication (B) |
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| X |
13 | S (B) | Signal Element Timing (B) |
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| X |
14 |
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15 |
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Figure D-6 V.11/x.21 Link Pinouts
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. Each end must be terminated in a male 15 pin X.21 connector as defined in