Installation guide

Remote Annex 4000 Hardware Installation Guide
Appendix B Cables and Connectors
B-12
PBX Loopback
Connector
The 50-pin male (90°) PBX loopback connector loops the following
signals: Transmit and Receive; RTS and CTS; and DTR, DCD, and
DSR.
Table B-7 shows the PBX loopback connector’s
pin/signal allocations.
Table B-7. PBX Loopback Connector Wiring
Pin Number
Remote Annex
4000 Signal
Connects to Pin
Number Signal
26 RXD1 27 TXD1
4 RTS1 29 CTS1
28 DTR1 1, 3 DCD1, DSR1
30 RXD2 31 TXD2
8 RTS2 33 CTS2
32 DTR2 5, 7 DCD2, DSR2
34 RXD3 35 TXD3
12 RTS3 37 CTS3
36 DTR3 9, 11 DCD3, DSR3
38 RXD4 39 TXD4
16 RTS4 41 CTS4
40 DTR4 13, 15 DCD4, DSR4
42 RXD5 43 TXD5
20 RTS5 45 CTS5
44 DTR5 17, 19 DCD5, DSR5
46 RXD6 47 TXD6
24 RTS6 49 CTS6
48 DTR6 21, 23 DCD6, DSR6