7.
If the signal is valid, ensure that the transmit and receive outputs from the patch panel to your equipment
are properly connected. For more information about fiber connections and terminations, refer to the
Turn Up a Node chapter in the Configuration guide.
8.
If a valid signal exists but the alarm does not clear, replace the cable connector on the NCS system.
9.
Repeat Steps
through
for any other port on the card that reports
the LOS (ESCON).
10.
If the alarm does not clear, the cabling could still be faulty despite correct attachments. Use the test set
to locate the bad cable and replace it using the procedures in the Configuration guide.
11.
If the alarm does not clear, look for any card-level alarm that could cause this port alarm.
12.
If the alarm does not clear, complete the
Physically Replace a Card, on page 453
procedure for the
reporting card.
DETAILED STEPS
Step 1
Check for any upstream equipment failures that could cause the ESCON LOS alarm in this node.
Step 2
If there is no cause upstream, verify cabling continuity from the transmitting port to the receiving port reporting this
LOS. To verify cable continuity, follow site practices.
Always use the supplied electrostatic discharge wristband when working with a powered NCS system. Plug
the wristband cable into the ESD jack located on the lower-right edge of the shelf assembly.
Caution
Step 3
If the continuity is good, clean the fiber according to site practice. If none exists, complete the fiber-cleaning procedure
in the Maintain the Node chapter in the Configuration guide.
Step 4
Ensure that the PPM (SFP) is correctly configured for this payload:
a) In node view (single-shelf mode) or shelf view (multishelf mode), double-click the card to open the card view.
b) Click the
Provisioning
>
Pluggable Port Modules
tabs.
c) Check the
Pluggable Port Modules
area for the PPM (SFP) associated with the port.
d) In the Pluggable Ports area, ensure that the rate for the errored PPM (SFP) is ESCON.
For information about provisioning PPMs (SFPs), refer to the Turn Up a Node chapter in the Configuration
guide. PPM (SFP) specifications are listed in the the
Installing the GBIC, SFP, SFP+, and XFP Optical
Modules in Cisco ONS PlatformsInstalling the GBIC, SFP, SFP+, QSFP, XFP, CXP, CFP and CPAK
Optical Modules in Cisco NCS Platforms
document.
Note
Step 5
If the physical cabling and PPM (SFP) are good but the alarm does not clear, verify that the correct port is actually in
service:
a) Confirm that the LED is correctly lit on the physical TXP card.
A green ACT/SBY LED indicates an active card. An amber ACT/SBY LED indicates a standby card.
b) To determine whether the port is in service, double-click the card in CTC to open the card view.
c) Click the
Provisioning
>
Line
tabs.
d) Verify that the Admin State column lists the port as IS, or (Unlocked).
e) If the Admin State column lists the port as OOS,MT (or Locked,maintenance) or OOS,DSBLD (or Locked,disabled),
click the column and choose
IS
or
Unlocked
. Click
Apply
.
Step 6
If the correct port is in service but the alarm has not cleared, use an optical test set to confirm that a valid signal exists
on the line. For specific procedures to use the test set equipment, consult the manufacturer. Test the line as close to the
receiving card as possible.
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
275
Alarm Troubleshooting
Clear the LOS (ESCON) Alarm