Comtech EF Data DMD-2050E - Manual (Page 174)

DMD2050E Univeral Satellite Modem Maintenance and Troubleshooting
MN-DMD2050E Revision 2 6–12
6.5 IBS Alarms and Actions
Figure 6-1 and Table 6-1show the IBS alarms and actions to be taken at the earth station, the
terrestrial data stream and the satellite. These alarms include those detected on the terrestrial link
and those detected from the satellite.
Figure 6-1. IBS Alarms
Table 6-1. IBS Fault Conditions and Actions (includes Drop and Insert)
Fault Detected on Terrestrial
Link (Across Interface A)
Action In Earth Station Action to Terrestrial
(Across Interface H)
Action to Satellite
(Across Interface D)
FA1 - Loss of Terrestrial
Input
AS1, 2 - IBS Prompt,
Service Alarm
AH2 - ‘1’ in Bit 3 of NFAS
TSO, Yellow Alarm
AD1 - AIS in Relevant TSs
FA2 - Loss of Terrestrial
Signaling
AS1 - IBS Prompt Alarm AH2 - ‘1’ in Bit 3 of NFAS
TSO, Yellow Alarm
AD3 - ‘1111’ in
RelevantTS16s
FA3 - Loss of Terrestrial
Frame
AS1 - IBS Prompt Alarm AH2 - ‘1’ in Bit 3 of NFAS
TSO, Yellow Alarm
AD1 - AIS in Relevant TSs
FA4 - Loss of Terrestrial
Multiframe
AS1 - IBS Prompt Alarm AH2 - ‘1’ in Bit 3 of NFAS
TSO, Yellow Alarm
AD3 - ‘1111’ in Relevant
TS16s
FA5 - BER of 1x 10 -3 or
Greater on Terrestrial Input
AS1 - IBS Prompt Alarm AH2 - ‘1’ in Bit 3 of NFAS
TSO, Yellow Alarm
AD1 - AIS in Relevant TSs
FA6 - Alarm Received on
Terrestrial Input
--- --- AD2 - ‘1’ in Bit 3 of Byte 32
Fault Detected From Satellite
(Across Interface E)
Action In Earth Station Action to Terrestrial
(Across Interface H)
Action to Satellite
(Across Interface D)
FA1 - Loss of Satellite
Signal Input
AS1, 2 - IBS Prompt,
Service Alarm
AH1, 3 - AIS in TSs, ‘1111’
in TS16
AD2 - ‘1’ in Bit 3 of Byte 32
FA2 - Loss of Satellite
Frame
AS1, 2 - IBS Prompt,
Service Alarm
AH1, 3 - AIS in TSs, ‘1111’
in TS16
AD2 - ‘1’ in Bit 3 of Byte 32
FA3 - Loss of Satellite
Multiframe
AS1, 2 - IBS Prompt,
Service Alarm
AH1, 3 - AIS in TSs, ‘1111’
in TS16
AD2 - ‘1’ in Bit 3 of Byte 32
FA4 - BER of 1E-3 or
Greater From Satellite Input
AS1, 2 - IBS Prompt,
Service Alarm
AH1, 3 - AIS in TSs, ‘1111’
in TS16
AD2 - ‘1’ in Bit 3 of Byte 32
FA5 - Alarm Received From
Satellite Input
AS2 - IBS Service Alarm AH2 - ‘1’ in Bit 3 of NFAS
TS0, Yellow Alarm
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