Comtech EF Data CRS-120 - Manual (Page 41)

1:1 Redundancy Switch Revision 3
Summary Of Specifications MN/CRS120.IOM
5–5
Power OFF/ON to modulators while both Alarm cables connected:
7. Turning OFF power only to the A modulator switches the B unit online and an alarm is reported.
When power is returned to A the B unit stays online.
8. Turing OFF power only to the B unit maintains the A unit online.
Restoring power to the B unit maintains the A unit online.
9. Turning OFF power only to the A modulator maintains the B unit online and an alarm is reported.
When power is returned to A the B unit stays online.
10. Turning OFF power only to the B modulator maintains B online.
Restoring power to the B unit maintains B online.
11. Turning OFF power only to the A modulator maintains the A unit online.
Connecting power to the A unit maintains A online.
12. Turing OFF power only to the B unit maintains the A unit online.
Restoring power to the B unit maintains the A unit online
5.3 Tx Online Status Contacts
There are Form C indicator contacts that report whether A or B is online. These are “clean”
contacts that are not used by the modulator or switch. These are located on the front panel of the
CRS-120 Switch.