| Pin | Name | Description |
|---|---|---|
| 1 | LINET/R | Line/talk receive |
| 2 | DAA GND | Modem DAA ground |
| 3 | DAA GND | Modem DAA ground |
| 4 | DAA GND | Modem DAA ground |
| 5 | /RA DVR | Modem relay A driver |
| 6 | DAA ID IN | ID input |
| 7 | /RING3 DET | Ring detect signal |
| 8 | /RBDVR | Modem relay B driver |
| 9 | DAA CNTL | Modem DAA control |
| 10 | +5 V MODEM | +5 V power |
When the PowerBook Duo computer is housed in the Duo Dock, you cannot access the integral modem via the RJ-11 connector on the PowerBook Duo's rear panel. A modem adapter card provides the connection. It plugs into the side of the Duo Dock's main logic board, using a 10-pin header connector. The card supplies the RJ-11 hook up, which is accessed on the rear panel of the Duo Dock. The adapter card interfaces with the modem card in the PowerBook Duo computer via its 10-pin connector, printed circuit traces, and the 152-pin expansion connector.
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