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10.3.3.1.2.1 CONFIG: Mask BUC
BUC alarm = Active
Attach to Tx alarm = No
When using L-Band, a Block Up Converter (BUC) may be included in the system. A 'smart' BUC
may be monitored and/or controlled via the modem via FSK (Frequency-Shift Keying control).
For a modem in a 1:1 redundancy setup, the fault indications must be
customized for the physical setup:
1. Two modems, two LNBs in parallel – If a fault occurs on the active
2. The more common redundancy setup is Two modems in parallel, one
If the system has no redundancy and was attached to an external audio alarm,
Attach to Tx alarm = Yes would indicate that a BUC fault has occurred, as the
fault would be included in the FORM C alarms.
Use the ▲▼ arrow keys to select BUC Alarm or Attach to Tx alarm.
•
For BUC Alarm, use the ▲▼ arrow keys to select Active or Masked.
•
For Attach to Tx alarm, use the ▲▼ arrow keys to select Yes or No.
Press ENTER when done.
ODU (Transceiver, BUC, LNB) Operation
modem/BUC pair and switchover is desired, the BUC mask should be
configured as Attach to Tx alarm = Yes.
BUC – If a fault occurs on the active modem, switchover is desired. But,
if a fault occurs on the BUC yet a switchover of modems does not fix the
problem, then switchover should not occur and the BUC mask should be
configured as Attach to Tx alarm = No.
CDM-425 Advanced Satellite Modem
(Active,Mask)
(Yes,No)()
10–7
Revision 0
MN-CDM-425
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