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10.3.3.1.2.2 CONFIG: Mask LNB
LNB alarm = Active
Attach to Rx alarm = No
When using L-Band, a Low-Noise Block Down Converter (LNB) may be included in the system. It
cannot be monitored and/or controlled by the modem, except for the power supply values.
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 Rx alarm = Yes would indicate that a LNB fault has occurred, as the
fault would be included in the FORM C alarms.
Use the ◄ ►arrow keys to select LNB Alarm or Attach to Rx alarm.
•
For LNB Alarm, use the ▲▼ arrow keys to select Active or Masked.
•
For Attach to Rx alarm, use the ▲▼ arrow keys to select Yes or No.
Press ENTER when done.
ODU (Transceiver, BUC, LNB) Operation
modem/LNB pair and switchover is desired, the LNB mask should be
configured as Attach to Rx alarm = Yes.
LNB – If a fault occurs on the active modem, switchover is desired. But, if
a fault occurs on the LNB, a switchover of modems might or might not fix
the problem. If switchover should take place, the LNB mask should
configured as Attach to Rx alarm = Yes.
CDM-425 Advanced Satellite Modem
(Active,Mask)
(Yes,No)()
10–8
Revision 0
MN-CDM-425
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