| Pin | Type | Description / Signal type | Connection /
Measuring notes |
|---|
| 1 | E/A | Motorola-internal | Interface |
| | | |
| 2 | | Not used | |
| | | |
| 3 | M | Ground | Ground connector |
| | | |
| 4 | E | Voltage supply terminal 30 | Fuse F74 |
| | | |
| 5 | E | Terminal R | Unloader relay terminal R |
| | | |
| 6 | E/A | Motorola-internal | Interface |
| | | |
| 7 | E/A | Motorola-internal | Interface |
| | | |
| 8 | E/A | Motorola-internal | Interface |
| | | |
| 9 | | Not used | |
| | | |
| 10 | A | Telephone mute signal | Connector, telephone mute |
| | | |
| 11 | E/A | Motorola-internal | Interface |
| | | |
| 12 | E/A | Motorola-internal | Interface |
| | | |
| 13 | | Not used | |
| | | |
| 14 | M | Negative input signal, microphone | Microphone Voice input |
| | | |
| 15 | A | Positive input signal, microphone | Microphone Voice input |
| | | |
| 16 | E | Voltage supply terminal 30 | Fuse F74 |
| | | |
| 17 | M | Ground | Ground connector |
| | | |
| 18 | E/A | Motorola-internal | Interface |
| | | |
| 19 | A | Positive input signal, speaker | Front loudspeaker Voice input |
| | | |
| 20 | M | Shield | Shield |
| | | |
| 21 | E/A | Motorola-internal | Interface |
| | | |
| 22 | | Not used | |
| | | |
| 23 | E/A | Motorola-internal | Interface |
| | | |
| 24 | E/A | Motorola-internal | Interface |
| | | |
| 25 | E | Negative input signal, speaker | Front loudspeaker Voice input |
| | | |