Comtech EF Data CDM-625 - Manual (Page 147)

CDM-625 Advanced Satellite Modem Revision 15
Front Panel Operation MN-CDM625
5–47
• Selecting Rx-Sat-AIS as Active generates a fault whenever the demodulator senses that the
‘all ones’ condition is present in the receive data.
• Typical for either, selecting AIS as Masked generates no alarms.
5.2.1.11.2 CONFIG: Mask  Buffer or Ref
Buffer Slip Alarm = Active (Active,Mask)
Reference Alarms = Active ()
Use the ◄ ► arrow keys to select Buffer Slip Alarm or Reference Alarms, and then typical for
either use the ▲▼ arrow keys to select as Active or Masked. Press ENTER when done. Note the
following:
• Selecting the Buffer Slip Alarm as Active generates a Buffer Slip fault in the Rx faults
whenever the receive circuitry senses that the buffer is either underflowing or overflowing.
5.2.1.11.3 CONFIG: Mask  RxIF
RxIF Alarms: AGC=Active (Active,Mask)
EbNo=Masked ()
Use the ◄ ► arrow keys to select AGC or EbNo and then, typical for either, use the ▲▼ arrow
keys to select the alarms as Active or Masked. Press ENTER when done. Note the following:
• 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, selecting the alarm as Masked, generates no alarms.
5.2.1.11.4 CONFIG: Mask  TxClk
Tx Clock Alarm: = Masked (Active,Masked)
(Valid in G.703 & Ext clock modes) ()
Use the ◄ ► arrow keys to select the Tx Clock Alarm as Active or Masked, and then press
ENTER. Note the following:
• Selecting the Tx Clock Alarm as Active generates a Tx Traffic alarm if a G.703 interface is
active and the input is lost or removed, or if selecting another interface type where the Tx
Clock mode is External and the clock is lost or removed.