Scenario 2: Span Loss Change > 5 Dbm And Osc Power Value On The Receiver > –42 Dbm - Cisco NCS 2000 series Troubleshooting Manual

Scenario 2: Span Loss Change > 5 dBm and OSC Power Value on the Receiver > –42 dBm
Note
Step 3 For the two fibers belonging to the repaired span, identify one for the east to west (E–W) line direction.
Step 4 Repeat the procedure starting at Step 2 for the E–W direction.
Step 5
Clean the LINE-RX and LINE-TX connectors for the failing fiber that was identified in the previous steps.
Step 6 If the problem persists, continue with Step 7. Otherwise, the corrective action is finished.
Step 7
Repair the failing fiber again until the expected OSC link is reestablished.
Warning Invisible laser radiation could be emitted from the end of the unterminated fiber cable or connector. Do
not stare into the beam directly with optical instruments. Viewing the laser output with certain optical
instruments (for example, eye loupes, magnifiers, and microscopes) within a distance of 100 mm could
pose an eye hazard. Statement 1056
Note Before disconnecting any optical amplifier card fiber for troubleshooting, ensure that the optical amplifier card
is unplugged.
Note If the OSC link cannot be reestablished (either by splicing or replacing the fiber), and the new value of Span
Loss cannot be modified, log into the Technical Support Website at http://www.cisco.com/techsupport for more
information or call Cisco TAC (1 800 553-2447) in order to report a service-affecting problem.
Scenario 2: Span Loss Change > 5 dBm and OSC Power Value on the Receiver > –42 dBm
In network view, both of the lines representing the span change to green; however, the status of the OCHNC
circuits relating to the repaired span remains Partial, instead of Complete (due to the fiber cut).
This change is due to the fact the physical optical power value received by the OSC transceiver is above the
sensitivity limit (–42 dBm) and consequently, the OSC optical link can be rebuilt, allowing the restoration of
the Section DCC (SDCC) or multiplex section DCC (MS-DCC). The network view for this condition is shown
in Figure 15: Network View for Span Loss Change > 5 dBm and OSC Power Value at Receiver > –42 dBm,
on page
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
68
The new value of the fiber Insertion Loss of this fiber after restoration must be less than 5 dB higher
than the previous Insertion Loss value. If possible, try to recover the original value by making a better
fiber splice. If this is not possible, use the new value (must be less than 5 dB higher than the previous
value) and rerun Cisco TransportPlanner to revalidate the new condition.
69.
General Troubleshooting