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Appendix B
Cables and Connectors
PBX Loopback
Connector
B-12
Remote Annex 4000 Hardware Installation Guide
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
Remote Annex
Pin Number
4000 Signal
26
RXD1
4
RTS1
28
DTR1
30
RXD2
8
RTS2
32
DTR2
34
RXD3
12
RTS3
36
DTR3
38
RXD4
16
RTS4
40
DTR4
42
RXD5
20
RTS5
44
DTR5
46
RXD6
24
RTS6
48
DTR6
Connects to Pin
Number
Signal
27
TXD1
29
CTS1
1, 3
DCD1, DSR1
31
TXD2
33
CTS2
5, 7
DCD2, DSR2
35
TXD3
37
CTS3
9, 11
DCD3, DSR3
39
TXD4
41
CTS4
13, 15
DCD4, DSR4
43
TXD5
45
CTS5
17, 19
DCD5, DSR5
47
TXD6
49
CTS6
21, 23
DCD6, DSR6
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