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CRS-311 1:1 Redundancy Switch
Appendix B
B.1.4
CRS-230 "System Alarms" Connector (DB-25F)
Table B‐3 indicates the pinout for the CRS‐230 DB‐25F "System
Alarms" connector.
Table B-3. "System Alarms" User Data Connector
Pin # Description
1 Traffic Modem Online Status – Common for Pin 6 (Note 2)
14
Not used
2 Not used
15
Not used
3 Not used
16
Not used
4 Not used
17
Not used
5 Not used
18
Not used
6 Traffic Modem Online Status – Normally Open (Note 2)
19
No Connection
7 Ground
20
Audio Indicator (Gnd = Auto On / Float = Audio Off)
Form C Fault Relay – Common (common for pins 9-12 and 21-
8
24)
21
Switch Unit Fault – Normally Closed
9 Switch Unit Fault – Normally Open
22
Modem Summary Unit Fault – Normally Closed
10 Modem Summary Unit Fault – Normally Open
23
Modem Summary Tx Traffic Fault – Normally Closed
11 Modem Summary Tx Traffic Fault – Normally Open
24
Modem Summary Rx Traffic Fault – Normally Closed
12 Modem Summary Rx Traffic Fault – Normally Open
25
Not Used
13 Not Used
Notes:
1. "Normally" refers to the NON‐FAILED state.
2.
Traffic Modem Online Status (Open = Online, Closed =
Backup)
B–3
Revision 7
MN/CRS311.IOM
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