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

Advanced satellite modem (18 kbps – 25 mbps)

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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:

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

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.

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