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6.2.1.11.1 CONFIG: Mask AIS
AIS:
Use the ◄ ►arrow keys to select Tx-Terr-AIS or Rx-Sat-AIS, and then use the ▲▼ arrow keys
to select either as Active or Masked. Press ENTER.
Note that:
•
When you select Tx-Terr-AIS as Active, the modem generates a fault whenever the
modulator senses that the 'all ones' condition is present in the terrestrial data.
•
When you select Rx-Sat-AIS as Active, the modem generates a fault whenever the
demodulator senses that the 'all ones' condition is present in the receive data.
•
Typical for either, when you select AIS as Masked, the modem generates no alarms.
6.2.1.11.2 CONFIG: Mask Buffer/Ref
Buffer Slip Alarm = Active (Active,Mask)
Reference Alarms = Active
Use the ◄ ►arrow keys to select Buffer Slip Alarm or Reference Alarms. Then, typical for
either choice, use the ▲▼ arrow keys to select Active or Masked.
When you select the Buffer Slip Alarm as Active, the modem generates a Buffer Slip Rx Fault
whenever the Rx circuitry senses that the buffer is either underflowing or overflowing. Press
ENTER.
6.2.1.11.3 CONFIG: Mask RxIF
RxIF Alarms: AGC=Active
Use the ◄ ►arrow keys to select AGC or EbNo. Then, typical for either choice, use the ▲▼
arrow keys to select the alarms as Active or Masked. Press ENTER.
Note that:
•
Selecting the AGC Rx IF Alarm as Active generates an AGC fault whenever the receive
signal level exceeds –20 dBm (for the desired carrier).
•
Selecting the EbNo Rx IF Alarm as Active generates an Eb/No fault whenever the
demodulator sees the receive Eb/No fall below the pre-determined value.
•
Typical for either, when you select Masked, the modem generates no alarms.
Front Panel Operation
Tx-Terr-AIS = Masked
Rx-Sat-AIS = Active
EbNo=Masked
CDM-425 Advanced Satellite Modem
(Active,Mask)
()
()
(Active,Mask)
()
6–49
Revision 0
MN-CDM-425
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