3Com 7600 manual Cleaning Dirty Fiber Optic Cables

B-2APPENDIX B: TROUBLESHOOTING

the cabling and connections at the port. Try sending the data through another port: if you can forward data through the unit via another port, it indicates a local problem with the first port. Re-examine cabling connections.

If you still cannot resolve the problem, contact your supplier.

Related Diagnostic When troubleshooting for problems, you may have to perform minor

Proceduresprocedures to help correct the problem. These procedures are described below. For more complex operations on the 7600 Card, contact your service person.

Cleaning Dirty

Fiber Optic

Cables

Fiber optic transceivers are sensitive optical devices that need to be handled carefully. If dirt collects on the fiber optic lens, you may notice that the LED for an ATM port link status does not light. You may also notice degraded performance of that port, indicated by an increase in the physical layer statistics count for that port.

To prevent dust from collecting on the fiber optic lens, keep the dust covers on the ports at all times when they are not in use. To clean a fiber optic lens, follow the procedure below:

1Remove any accumulated dust or debris from the port or connector by blowing off all surfaces with a canned air duster.

Compressed gas is recommended, such as Chemtronics’ Ultrajet ® or the Triangle Tool Group’s Liqui-Too!™ Dust-A-Way. Do not use commercial compressed air or “house air” because of the risk of oil contamination.

2Reconnect the cable to the port to see if the dusting corrected the problem.

3If the LED still does not appear, or if it lights yellow, continue with steps 5 and 6.

4Gently wipe the ports with a lint-free, nonabrasive, non-adhesive swab. Microswabs ™ by Texwipe™ are recommended.

5Gently wipe the connectors with a lint-free, nonabrasive wipe or pad. Texwipe™ pads are recommended.