Comtech EF Data CDM-760 - Manual (Page 149)

Front Panel Operation Revision 2
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
6–63
Use the  arrow keys to select Enable and then press ENTER to execute a diagnostic test on
the front panel LED Indicators and the VFD.
The test run checks each LED Indicator, individually and as a group, while generating a series of
test patterns on the VFD. Normal operations resume upon completion of the test.
6.2.6.5 (Utility:) 1:1
1:1: Manual/Auto Force Status
Use the   arrow keys to select a parameter. Press ENTER .
(Utility: 1:1) Manual/Auto
1:1 Redundancy: Manual
Use the  arrow keys to select Manual or Auto. Press ENTER. The operational states for 1:1
Redundancy are as follows:
• Manual – The currently active modem remains Online regardless of any current or future
faults. Online and Offline (Standby) modems remain in this state until you Force the
switchover.
• Auto – The redundancy switch chooses which modem is Online based on fault conditions:
o
If the original Online modem, Unit ‘A’ becomes faulted, then switch occurs to the Offline
modem, Unit ‘B’ only if it is fault-free.
o
Switchover back to Unit ‘A’ occurs only if the Standby Unit ‘B’ – now the Online unit –
becomes faulted and Unit ‘A’ is clear of any faults. Operation cannot revert to the
original Online modem, Unit 'A, until it clears its faults.
(Utility: 1:1) Force
This Unit is in Standby (1:1 only)
This screen identifies the conditional state for, and allows you to execute, a forced switchover as
follows:
Message Description
1:1 redundancy is Not Connected
This message indicates that the modem’s rear panel J2 | REDUNDANCY
connector is not connected to a supported 1:1 redundancy switch such as
the CRS-170A or CRS-180.