F.3.3.1.2.2 Config: Mask  Lnb - Comtech EF Data CDM-625 Installation And Operation Manual

CDM-625 Advanced Satellite Modem
Appendix F
F.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.
2.
First, use the ◄ ►
•
For LNB Alarm, use the
•
For Attach to Rx alarm, use the
Press ENTER when done.
Two modems, two LNBs in parallel – If a fault occurs on the active modem/LNB
pair and switchover is desired, the LNB mask should be configured as Attach to
Rx alarm = Yes.
The more common redundancy setup is Two modems in parallel, one 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.
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.
arrow keys to select LNB Alarm or Attach to Rx alarm. Then:
arrow keys to select Active or Masked.
▲▼
(Active,Mask)
(Yes,No)()
arrow keys to select Yes or No.
▲▼
F–8
Revision 13
MN-CDM625