Config: Mask Lnb; Config: Mask Cex (G.703 Clock Extension Mask) - Comtech EF Data CDM-625 Installation And Operation Manual

CDM-625 Advanced Satellite Modem
Front Panel Operation
5.4.11.9 CONFIG: Mask
LNB alarm = Active
Attach to Rx alarm = No
When using L-band, a LNB (Low-Noise Block) 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 set-up, the fault indications need to be customized for the physical set-up.
Consider:
Two modems, two LNBs in parallel:
switchover is desired, so you should configure the LNB mask to Attach to Rx alarm.
The other (more regularly encountered) redundancy set-up:
Two modems in parallel, one LNB:
desired. If a fault occurred on the LNB, a switchover of modems might or might not fix the
problem. If switchover should be implemented, the user should configure the LNB mask:
Attach to Rx alarm=Yes.
If the system had no redundancy, but was attached to an external audio alarm, Attaching to
Rx alarm would cause a LNB fault to be indicated, as the fault would be included in the
FORM C alarms.
Use the ◄ ►
arrow keys, then press ENTER.
5.4.11.10 CONFIG: Mask
G.703 Clock Extension = Active
(Active, Masked)
Select Active or Masked using the
If the user selects Active, a CEX alarm will be generated if the G.703 Clock Extension mode is
set to TxLock, and the input is lost or removed from the G.703 interface.
LNB
arrow keys to select the parameter to edit. Edit the alarm mask using the
CEX (G.703 Clock Extension mask)
▲ ▼
(Active,Mask)
(Yes,No)(34v)
If a fault occurred on the active modem/LNB pair,
If a fault occurred on the active modem, switchover is
arrow keys, then press ENTER.
5–40
MN-0000036 (Ref MN/CDM625.IOM)
(v)
Revision 1
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