| Pin | Signal | Description |
| 1,2,3 | shorted | for Alcatel 531 |
| 5 | Tx | may be RX |
| 6 | Rx | may be TX |
| 8 | R=48KOm to GND | for Alcatel 531 |
| 13,14,15 | GND | |
| 16 | +5V | for Alcatel 531 |

| Pin | Signal | Description |
| 1,2,3 | shorted | for Alcatel 531 |
| 5 | Tx | may be RX |
| 6 | Rx | may be TX |
| 8 | R=48KOm to GND | for Alcatel 531 |
| 13,14,15 | GND | |
| 16 | +5V | for Alcatel 531 |