CNB port diagnostics — media status

Diagnostic Counter
Description
Active Channel
Channel whose data is currently being used.
Redundant Chan
Status of second channel on 1756-CNB module.
Ch A LED State and Ch B LED State
Status of channel A and channel B. Possible values are:
  • Both solid off
  • Both solid red
  • Alternating red/green
  • Alternating red/off
  • Solid off
  • Flashing red/green
  • Flashing red/off
  • Flashing green/off
  • Solid green
Network status indicators:
Indicator state
How to view
Cause
Both solid off
Viewed together
Reset or no power
Both solid red
Viewed together
Failed link interface
Alternating red/green
Viewed together
Self-test
Alternating red/off
Viewed together
Bad node configuration
Solid off
Viewed independently
Channel disabled or not supported
Flashing red/green
Viewed independently
Invalid link configuration
Flashing red/off
Viewed independently
Link fault or no MAC frames received
Flashing green/off
Viewed independently
Temporary channel error, or listen only
Solid green
Viewed independently
Normal operation
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Normal