Specifications

3-28
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 3 Maintenance
Span Upgrades
The forced switch clears and traffic is running. If you have lost traffic, perform a downgrade. The
procedure for downgrading is the same as upgrading except that you choose a lower-rate card.
Note You cannot downgrade if circuits exist on the STSs that you will remove (the higher STSs).
Step 10 The span upgrade is complete.
Procedure: Perform a Manual Span Upgrade on a 1+1 Protection Group
When upgrading a 1+1 group, upgrade the protect line first regardless of which line is active. Both lines
in a 1+1 group must be upgraded before the added bandwidth will be available.
Note If the switching mode is bidirectional in the 1+1 protection group, apply the Force command to only
one end of the span, not both. The Clear command will apply to the end the Force was applied to. If
the Force command is applied to both ends when the switching mode is bidirectional, it will cause a
switch of more than 50 ms in duration.
Step 1 Ensure that no alarms or abnormal conditions (regardless of severity), including LOS, LOF, AIS-L, SF,
SD, and FORCED-REQ-RING are present on the span that you will upgrade:
a. In node view, click on the Alarms tab to view a list of current alarms.
b. In node view, click on the Conditions tab and click the Retrieve Conditions button to view a list
of current conditions.
An unresolved alarm or abnormal condition is the most probable reason for upgrade failure.
Step 2 Apply a force switch on the ports that you will upgrade, beginning with the protect port:
a. In node view, click the Maintenance > Protection tabs.
b. Under Protection Groups, choose the 1+1 protection group.
c. Under Selected Group, choose the protect port (regardless if it is active or standby).
d. From Switch Commands, click Force.
e. Click Yes on the confirmation dialog box.
Step 3 Repeat Step 2 for each port.
Step 4 Remove the fiber from both ends of the span and ensure that traffic is still running.
Step 5 Remove the OC-N cards from both span endpoints.
Step 6 At both ends of the span, in node view, right-click the OC-N slot and choose Change Card.
Step 7 In the Change Card dialog box, choose the new OC-N type.
Step 8 Click OK.
Step 9 Install the new OC-N cards in both endpoints and attach the fiber to the cards.
Wait for the IMPROPRMVL alarm to clear and the cards to become standby.
Step 10 When cards on each end of the line have been successfully upgraded and all the facility alarms (LOS,
SD or SF) are cleared, remove the forced switch:
a. In node view for either endpoint, click the Maintenance > Protection tabs.