Troubleshooting Dwdm Xfps - Avaya 8800 Troubleshooting Manual

Layer 1 troubleshooting
6. Compare the measured receive power for the near-end optical device to the
7. If a receiver is saturated but still operable, install a suitable attenuator.
8. To help debug the link, loop back the local transmit and receive ports, and use the

Troubleshooting DWDM XFPs

As a physical layer device, a DWDM XFP does not require specific configuration to be used.
If you experience issues with DWDM XFPs, perform the following steps.
Procedure steps
1. To ensure that the DWDM XFPs under use are properly supported, enter the
2. In Enterprise Device Manager, select the DWDM XFP port, and then select Edit,
3. If the DWDM XFP port shuts down suddenly, the ddm-alarm-portdown option may
346 Troubleshooting
multimode). If the receiver power is measured to be zero, and the link used to work,
it is probable that the far-end transmitter is not operating or the fiber is broken.
measured receive power for the far-end device.
Large differences could mean that the optical devices are mismatched (that is, -SX
versus -LX). If optical devices are mismatched, the receiver can be saturated
(overdriven).
For long-haul optical devices, the receive power must be significantly less that the
transmit power.
DDM parameters to help determine the fault.
following CLI command:
show sys pluggable-optical-modules info
OR
enter the following ACLI command:
show pluggable-optical-module basic
From the command output, verify whether the DWDM XFPs are recognized by the
Ethernet Routing Switch as DWDM.
Port, General, DDI/SFP and verify that the correct information is displayed in the
DDI/SFP tab for the DWDM XFP.
be activated. A high or low alarm may have occurred on the port. In this case, check
whether a message has been logged or a trap has been generated on the port due
to the alarm occurring. If a log or trap is present, take remedial actions to clear the
alarm, depending on the type of alarm.
Comments? infodev@avaya.com
July 2013