Chapter 6. Errors and error recovery
(7) Transmission error (CRC error, overrun)
ERR LED
Flicker at 1 sec intervals
- Error information of each station : bit14 ON
Has an error occurred
in the loop-back check?
It may be assumed that this is a
temporary problem caused by noise, etc.
Observe developments for a while.
Run a loop-back check
(refer to section 7.3.)
YES
NO
Does it happen frequently?
Is the cable correctly connected?
Is the cable firmly secured in place?
Is there a noise source
nearby the transmission cable
or unit?
Is an optical cable
within the specification range?
Does the loss of
the optical cable satisfy a
standard? *
Reconnect the cable correctly.
Secure the cable firmly in place.
Separate the noise source from the cable
and unit.
Use it within the specification range of
the optical cable.
It expects that there is a problem in the
optical cable itself, the connector
installation work, and so on.
NO
NO
NO
YES
YES
YES
NO
YES
YES
NO
YES
NO
Replace the module with a spare one,
if available.
Notify your local authorized distributor
of it.
*
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