| Number | X-pin, colour | Description |
|---|---|---|
| X18509 | 8-pin, Black | Plug connector Keypad handset |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | E/A | Motorola-internal | Transceiver |
| 2 | E/A | Motorola-internal | Transceiver |
| 3 | E/A | Motorola-internal | Transceiver |
| 4 | E/A | Motorola-internal | Transceiver |
| 5 | E/A | Motorola-internal | Transceiver |
| 6 | E/A | Motorola-internal | Transceiver |
| 7 | E/A | Telephone ON/OFF | Transceiver |
| 8 | E/A | Motorola-internal | Transceiver |