Nevion HD-TD-10GX-8-SFP - Manual (Page 11)

HD-TD-10GX-8 Rev. A
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3.1.1 Laser on/off
The video transport from mux to de-mux will obviously not work when the laser is switched
off, and this setting is primarily intended as a safety feature when work is being done on the
rear of a live Flashlink rack. A GPIO input line is also available to disable the laser, see ch.
3.3.
3.1.2 Sticky vs. Normal error indication
In the Sticky error indication mode, the error bits will only be cleared when the operator resets
the error counter from the Multicon Info page. The error counters will still only count the
number of fields or frames that actually contains errors. This way it is possible to diagnose
the error even a long time after the error situation has been rectified. Note however, that if
several errors have occurred since the last counter reset it will not be possible to tell when or
for how long each was present, or if they occurred at the same time or not.
When errors are detected and counted they are indicated on the Multicon Info page by red
background in the corresponding error box. Default behavior (Normal error indication mode)
is to accumulate the number of errors occurred between each time Multicon asks for status.
Due to the internal architecture of Multicon, it is possible that errors will occur and the error
counter increase without any error bits being shown as red on the information page. The
processes that retrieve information from the cards are not synced up to the processes that
display the results to multiple users/clients. What this means is that short-lived errors may
turn up and disappear again between two web browser updates for a certain client. The error
will be counted, but the operator may never see any indication of what kind of error that
occurred.
The sticky error indication mode is also useful to capture errors that occur very infrequently,
in order to find out what type of error it was.
3.1.3 Signal integrity
Eight built-in analyzers – one for each input or output – will report errors seen in the previous
video frame. There is also an analyzer for the 10G fiber input. The errors that can be detected
in one or more of the detectors are:
NO_EDH: No EDH flags
VS: Unexpected video format (see ch 3.1.4)
FF-CRC: Full-frame checksum error
AP-CRC: Active picture checksum error
LOCK : Can’t lock to incoming video standard
CCS / YCS: Checksum error in ancillary data packets, Y or C data space.
CCRC / YCRC: Line checksum error, Y or C (HD only)
LNUM: Unexpected line number sequence (HD only)
SAV: Unexpected Start-of-active-video sequence
EAV: Unexpected End-of-active-video sequence
Illustration 4: Selection of error bits to be counted or ignored