Scenario A: Optical Power Level of the Incoming Signal Lower Than Minimum Allowed by MSTP
Supported Optical Interfaces
This scenario is for a condition where a TXP or MXP card is directly connected to a 32MUX-O, 40MUX,
32WSS, or 40WSS-C card where power in is expressed as Pin < –4.5 dBm.
If the incoming power level is lower than the minimum allowed, the startup procedure always stops at Phase 1
(see Figure 20: LOS-P Indication on the VOA Port, on page 82). This is the case even if the final VOA Power
Reference reported in CTC is reachable.
The final conditions that CTC reports are:
• A LOS-P (OCH layer) alarm on the port associated with the VOA (see Figure 20: LOS-P Indication on
the VOA Port, on page 82)
• A valid optical power value (different from the end of scale value of – 50 dBm) in the Power field, but
the value for Power is less than –33 dBm. (To view the Power field, in card view, click the Provisioning
> Parameters tabs.)
Figure 20: LOS-P Indication on the VOA Port
Use the following procedure to troubleshoot and eventually fix issues related to the VOA start-up when the
optical power level of the incoming signal is lower than the minimum allowed by the MSTP supported optical
interfaces.
Corrective Action for Scenario A
SUMMARY STEPS
1. Verify the alarm validity:
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
82
General Troubleshooting
Scenario A: Optical Power Level of the Incoming Signal Lower Than Minimum Allowed by MSTP Supported Optical Interfaces
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