3Com CoreBuilder 7000, Installation & Start?Up Manual, Page: 95 / 150

Related Diagnostic Procedures 95
Related Diagnostic
Procedures
When troubleshooting problems occur, you may have to perform minor
procedures to help correct the problem. These procedures are described
below. For more complex operations on the CoreBuilder 7000 family ATM
switch, contact 3Com Technical Support.
Safety Precautions for Fiber Optics Connectors
Avoid touching all surfaces after cleaning the connectors, and keep all
unused ports covered.
Vermeiden Sie das Berühren aller Oberflächen nach dem Säubern der
Kontakte und verdecken Sie alle nicht benutzten Öffnungen.
Ne toucher aucune surface après le nettoyage des connecteurs et garder
les pièces inutilisées couvertes.
Table 15
Diagnostic Procedures
Procedure Action
Checking fan
operations In case of system overheating, check that the power supply fan and the fans in the fan tray
are operating. To check for fan movement in the CoreBuilder 7000 family ATM switch’s
fan tray, pull a few modules from the chassis to view the fans on the left side of the
system.
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:
1 Remove any accumulated dust or debris from the port or connector by blowing off all
surfaces with a canned air duster.
2 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.
3 Reconnect the cable to the port to see if the dusting corrected the problem.
4 If the LED still does not appear, or if it lights yellow, continue with steps 5 and 6.
5
Gently wipe the ports with a lint-free, non-abrasive, non-adhesive swab. Microswabs™
by Texwipe™ are recommended.
6 Gently wipe the connectors with a lint-free, non-abrasive wipe or pad. Texwipe™ pads
are recommended.
* See safety precautions in next section.