b) Click the
Alarms
tab and verify that a LOS condition is present on the LINE-RX port. If the alarm is correctly
reported, move to
. If not, close the CTC application, delete the CTC cache and reopen the CTC
connection.
c) Click the
Synchronize
button on the bottom left of the window.
If the "gray condition" of the span persists, log into Technical Support Website at
for more information or call Cisco TAC ( 1 800 553-2447) in order to report a
service-affecting problem.
Note
Step 4
If the network ALS setting on the DWDM nodes that you are troubleshooting is Auto Restart, continue with
; if the network ALS setting is DISABLE, go to
Step 5
Isolate the fiber affected by the fiber cut. For the two fibers belonging to the span, identify the fiber belonging to the
west-to-east (W–E) line direction:
a) Go into the upstream node and identify the OSCM or OSC-CSM card managing the OSC termination referring to
the faulty span.
b) Double-click the card, then click the
Maintenance Panel
tab.
c) Force the OSC-TX laser to be active by setting the ALS Mode to
DISABLE.
d) Go into the downstream node and verify if OSC power is being received.
• If a pair of OPT-BST + OSCM cards terminate the OSC connection, click the Provisioning > Optical Line >
Parameters tabs, then verify that there is power for OSC-TX (Port 4).
• If an OSC-CSM terminates the OSC connection, click the Provisioning > Optical Line > Parameters tabs, then
verify that there is power for OSC-RX (Port 6).
e) If no power is detected and the LOS (OC-3) alarm persists, go to
; otherwise, the fiber under test is
good. In this case, go to Step f to check the other fiber.
f)
Repeat Steps a to d for the other fiber to verify that it is at fault.
Step 6
Repair the identified broken fiber to restore the internode link.
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
Warning
Before disconnecting any optical amplifier card fiber for troubleshooting, ensure that the optical amplifier card
is unplugged.
Note
LOS (TRUNK)
Default Severity: Critical (CR), Service-Affecting (SA)
Logical Object: TRUNK
The Loss of Signal (LOS) for a TRUNK applies to GE-XP, 10GE-XP, TXP_MR_10G, TXP_MR_2.5G,
TXPP_MR_2.5G, TXP_MR_10E, TXP_MR_10E_C, TXP_MR_10E_L, MXP_2.5G_10G, AR_MXP, AR_XP,
AR_XPE, ADM-10G, and OTU2_XP cards.
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
278
Alarm Troubleshooting
LOS (TRUNK)
