Comtech EF Data CDM-625A Installation And Operation Manual page 477

CDM-625A Advanced Satellite Modem
CDM-625A ODU (Transceiver, BUC, LNB) Operation
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)
2)
First, use the
▲▼
•
For BUC Alarm, use the
•
For Attach to Tx alarm, use the
Press ENTER when done.
Two modems, two LNBs in parallel – If a fault occurs on the active
modem/BUC pair and switchover is desired, the BUC mask should be configured
as Attach to Tx alarm = Yes.
The more common redundancy setup is Two modems in parallel, one 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.
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.
arrow keys to select BUC Alarm or Attach to Tx alarm. Then:
arrow keys to select Active or Masked.
▲▼
▲▼
(Active,Mask)
(Yes,No)()
arrow keys to select Yes or No.
10–7
MN-CDM625A
Revision 4