C. Description of System Interfaces
C.1. PBX INPUT Ports A and B (DB9 Male)
Pin Signal
1 Not Connected
2 Receive Data (In)
3 Transmit Data (Out)
4 Data Terminal Ready (Out)
5 Signal Ground
6 Not Connected
7 Not Connected
8 Clear to Send (In)
9 Not Connected
Figure C.1: PBX Ports A and B
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