CDM-625 Advanced Satellite Modem
Revision 1
Front Panel Operation
MN-0000036 (Ref MN/CDM625.IOM)
5.4.11.7
CONFIG: Mask
Æ
Terr-Alarm
Terr-Alm: Tx= Active (Active,Mask)
Rx= Off (Off,Enabled)(
34v
)
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
Æ
BUC
BUC alarm = Active (Active,Mask)
Attach to Tx alarm = No (Yes,No)(
34v
)
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:
If a fault occurred on the active modem/BUC pair,
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:
If a fault occurred on the active modem, switchover is
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 to select the parameter to edit. Edit the alarm mask using the
▲
▼
arrow keys, then press
ENTER
.
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