GS9001_04 Datasheet, PDF (13/14 Pages) Gennum Corporation – EDH Coprocessor

These errors result in the transmission error flags EDH and The next device in the chain is a distribution amplifier (DA)
EDA and the non-transmission related flags IDH and IDA.
which is receiving its input from the router. The GS9001 device
In Figure 9, the AES/EBU audio encoder has generated an
error during the audio formatting process and reported an IDH
in the DA will recode the incoming EDH flag as EDA (Error
Detected Already) and pass the IDA flag.
(Internal device error Detected Here) error.
An additional transmission error occurs between the DA and
The signal from the audio encoder then experiences
degradation from a faulty cable, before it reaches the router.
the production switcher which is flagged as EDH. The GS9001
in the production switcher now has a list of error flags that can
be reported locally or through a communications interface to
In this case, the cable is marginal and is producing random ^{a central maintenance station.}
infrequent errors. A GS9001 device in the router flags these
errors as EDH (Error Detected Here) for Active Picture, Full
Field or both. Incoming IDH flags are also recoded as IDA
(Internal device error Detected Already).
ED _VTR
END ^{NS Audio}
Video
IDH
AUDIO
ENCODE
ROUTER
EDH
IDA
DA
Internal Device
M _IG Error
Transmission
Error
Communication
Interface
Transmission
Error
EDA
IDA
M S _CENTRAL
O ^E _{MICROPROCESSOR}
C ^D _{Fig. 9}
PRODUCTION
EDH
SWITCHER
EDA
IDA
RE _{EW VTR}
T ^{(NO EDH)}
NO ^{R N Audio}
Video
UES
IDH
AUDIO
ENCODE
ROUTER
(NO EDH)
O _{Internal Device}
F^Error
Transmission
Error
UES
IDH
DA
Transmission
Error
UES
IDA
EDH
Communication Interface
CENTRAL
MICROPROCESSOR
Fig. 10
PRODUCTION
UES
IDA
SWITCHER
EDA
EDH
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