Nevion 3GHD-CHO-2x4 - Manual (Page 17)

3GHD-CHO-2x4/2x3 Rev. C
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1. Multiple bursts of error within timer duration triggers a switching to standby.
2. Single continuous error condition whose duration exceeds timer triggers a switching
to standby.
3. Error free periods, whose duration exceeds timer, triggers a switching back to main.
The trigger also has a setting for "bit operator". It is possible to do a logical AND on the bits
after applying the mask. Set to AND, all the individual error types that have been enabled must
be occurring to count as an error condition. Set to OR, any enabled error type will suffice.
8.9 Video analyzers
The two inputs have their own analyzer, called channel 1 and 2. In addition also each channel
has an A and B analyzer which reflect the level A and B in a 3G-SDI stream.
These errors can be counted (or ignored) based on the settings in the configuration view:
EDH No EDH packets (SD only)
VSTD SMPTE 352 packets do not correspond to detected video standard (SD/HD
only) Not supported for 3G.
FFCRC Full Field CRC (SD only)
APCRC Active Picture CRC (SD only)
LOCK Analyzer chip is not locked to a bit stream (or stream 2 not present, for
"Stream 2" analyzer)
CCS Chroma channel ancillary data check sum error
YCS Luma channel ancillary data check sum error
CCRC Chroma channel video data check sum error
YCRC Luma channel video data check sum error
LNUM Line number error
SAV Start of active video flags missing or misplaced
EAV End of active video flags missing or misplaced
Errors are checked once per video field (LOCK errors are counted every 20ms when no video
is present). If an error occurs, it is checked against the bit mask, and if selected for counting
increments the error counter. An SNMP tool is recommended for tracking error counts over
time, with selectable limits on error rate and max count before generating a warning.