| Number | X-pin, colour | Description |
|---|---|---|
| X4545 | 18-pin, Black | Plug connector Interface |
| X01048 | 12-pin, Black | Plug connector Interface |
| X01049 | 6-pin, Black | Plug connector Interface |
| 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 | Not used | ||
| 6 | E/A | Motorola-internal | Transceiver |
| 7 | E/A | Motorola-internal | Transceiver |
| 8 | E | Terminal R | Unloader relay terminal R |
| 9 | E/A | I-bus signal line | X322 Connector |
| 10 | E | Signal Speed signal | X322 Connector |
| 11 | E/A | Telephone mute signal | X322 Connector |
| 12 | Not used | ||
| 13 | E/A | Motorola-internal | Transceiver |
| 14 | E/A | Motorola-internal | Transceiver |
| 15 | E | Signal, terminal 58 dimmer | X322 Connector |
| 16 | E/A | Motorola-internal | Transceiver |
| 17 | M | Ground | Ground connector |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | A | Motorola-internal | Eject box |
| 2 | A | Motorola-internal | Eject box |
| 3 | A | Motorola-internal | Eject box |
| 4 | A | Motorola-internal | Eject box |
| 5 | A | Motorola-internal | Eject box |
| 6 | A | Motorola-internal | Eject box |
| 7 | A | Motorola-internal | Eject box |
| 8 | A | Motorola-internal | Eject box |
| 9 | A | Motorola-internal | Eject box |
| 10 | A | Motorola-internal | Eject box |
| 11 | A | Motorola-internal | Eject box |
| 12 | A | Motorola-internal | Eject box |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | A | Motorola-internal | Eject box |
| 2 | A | Motorola-internal | Eject box |
| 3 | A | Motorola-internal | Eject box |
| 4 | A | Motorola-internal | Eject box |
| 5 | A | Motorola-internal | Eject box |
| 6 | A | Motorola-internal | Eject box |