Comtech EF Data CDM-625 Installation And Operation Manual page 111

CDM-625 Advanced Satellite Modem
Front Panel Operation
5.4.11.7 CONFIG: Mask
Terr-Alm: Tx= Active
Note: These alarms are applicable for D&I operation only.
◄ ►
Use the arrow keys to select the parameter to edit. Edit the alarm mask using the
arrow keys, then press ENTER.
5.4.11.8 CONFIG: Mask
BUC alarm = Active
Attach to Tx alarm = No
When using L-band, a BUC (Block Up Converter) may be included in the system. A 'smart' BUC
may be monitored and/or controlled via the modem, via FSK. For a modem in a 1:1 redundancy
set-up, the fault indications need to be customized for the physical set-up.
Consider:
Two modems, two BUCs in parallel:
switchover is desired, so you should configure the BUC mask to Attach to Tx alarm.
The other (more regularly encountered) redundancy set-up:
Two modems in parallel, one BUC:
desired. If a fault occurred on the BUC, a switchover of modems could not fix the problem,
so switchover should not occur, so you should configure the BUC mask: Attach to Tx
alarm=No.
If the system had no redundancy, but was attached to an external audio alarm, Attaching to
Tx alarm would cause a BUC fault to be indicated, as the fault would be included in the
FORM C alarms.
Use the ◄ ►
arrow keys, then press ENTER.
Terr-Alarm
Rx= Off
BUC
arrow keys to select the parameter to edit. Edit the alarm mask using the
MN-0000036 (Ref MN/CDM625.IOM)
(Active,Mask)
(Off,Enabled)(34v)
(Active,Mask)
(Yes,No)(34v)
If a fault occurred on the active modem/BUC pair,
If a fault occurred on the active modem, switchover is
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