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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 4 Maintenance
Fiber Cleaning
e. In the confirmation dialog box, click Yes.
The forced switch clears, and traffic begins running. If you have lost traffic, downgrade. The procedure
to downgrade is identical to the upgrading procedure, except that you choose a lower-rate card type.
Note You cannot downgrade if circuits exist on the STM-Ns that would be removed (i.e., the higher
STM-Ns).
Step 14 Repeat these step if there are other lines in the 1+1 group.
4.6 Fiber Cleaning
All optical connectors must be handled with great care and be kept absolutely clean to prevent serious
transmission breakdowns. As soon as a connector or inter-connector has been opened, the free ends must
be protected with anti-dust caps. The following materials and equipment are necessary to clean the
surface of the fiber ends and inspect the fiber afterwards:
Video fiber connector inspection instrument
Cletop cleaning cassette
Caution Before cleaning the optical connectors in an optical card, remove the card from the subrack and place
it on a suitable anti-static mat.
Procedure: Inspection
Step 1 Check the optical connector for large scratches. If you find a scratch, replace the connector. A connector
is replaced by splicing a new pigtail.
Step 2 Check the connector end surface under the microscope. Any dark spots seen on the surface of the ends
are caused by dirt or possible damage. Pay special attention to the core-surface.
Step 3 If you cannot eliminate the spots by cleaning, this indicates damage to the glass fibre. You must replace
the connector.
Purpose Inspecting optical connectors
Tools/Equipment Video fiber connector inspection instrument
Cletop cleaning cassette
Compressed air
Prerequisite procedures
Required/As Needed Required every time an optical connection is opened
On Site/Remote On Site
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