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Connector pinout: Siemens C55, S55, SL55, M55 Siemens C55, S55, SL55, M55 pinouts

| pin | name | direction | description | color | | 1 | VBatt | | VBatt | | | 2 | Gnd | | Gnd | | | 3 | FBus Tx | | FBus Tx | | | 4 | FBus Rx | | FBus Rx | | | 5 | CTS | | CTS | | | 6 | RTS | | RTS | | | 7 | DCD | | DCD | | | 8 | Audio P | | Audio P | | | 9 | -- | | -- | | | 10 | Audio N | | Audio N | | | 11 | Gnd Mic | | Gnd Mic | | | 12 | EPP | | EPP | |
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