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DMD15/DMD15L/DMD15/DMD15LL/DMD15/DMD15LIBS/IDR Satellite Modem Maintenance
TM051 - Rev. 5.8 6-5
Figure 6-10. IBS Alarm Concept
Table 6-4. IBS Fault Conditions and Actions (includes Drop and Insert)
Fault Detected on
Terrestrial Link
(Across Interface A)
FA1 - Loss of
Terrestrial Input
FA2 - Loss of
Terrestrial Signaling
FA3 - Loss of
Terrestrial Frame
FA4 - Loss of
Terrestrial Multiframe
FA5 - BER of 1x 10
-3
or Greater on
Terrestrial Input
FA6 - Alarm Indication
Received on
Terrestrial Input
Action In Earth
Station
AS1, 2 - IBS Prompt,
Service Alarm
AS1 - - IBS Prompt
Alarm
AS1 - - IBS Prompt
Alarm
AS1 - IBS Prompt
Alarm
AS1 - IBS Prompt
Alarm
---
Action to Terrestrial
(Across Interface H)
AH2 - ‘1’ in Bit 3 of
NFAS TSO, Yellow
Alarm
AH2 - ‘1’ in Bit 3 of
NFAS TSO, Yellow
Alarm
AH2 - ‘1’ in Bit 3 of
NFAS TSO, Yellow
Alarm
AH2 - ‘1’ in Bit 3 of
NFAS TSO, Yellow
Alarm
AH2 - ‘1’ in Bit 3 of
NFAS TSO, Yellow
Alarm
---
Action to Satellite
(Across Interface D)
AD1 - AIS in Relevant
TS’s
AD3 - ‘1111’ in
RelevantTS16’s
AD1 - AIS in Relevant
TS’s
AD3 - ‘1111’ in
Relevant TS16’s
AD1 - AIS in Relevant
TS’s
AD2 - ‘1’ in Bit 3 of
Byte 32
Fault Detected From
Satellite
(Across Interface E)
FA1 - Loss of Satellite
Signal Input
AS1,2 - IBS Prompt,
Service Alarm
AH1, 3 - AIS in TS’s,
‘1111’ in TS16
AD2 - ‘1’ in Bit 3 of
Byte 32