3Com 7000 manual Safety Precautions for Fiber Optics Connectors

Related Diagnostic Procedures 95

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

Proceduresprocedures 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.

Table 15 Diagnostic Procedures

Procedure	Action
Checking fan	In case of system overheating, check that the power supply fan and the fans in the fan tray
operations	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	Fiber optic transceivers are sensitive optical devices that need to be handled carefully. If dirt
optic cables*	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.

2Compressed 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.

3Reconnect the cable to the port to see if the dusting corrected the problem.

4If the LED still does not appear, or if it lights yellow, continue with steps 5 and 6.

5Gently wipe the ports with a lint-free, non-abrasive, non-adhesive swab. Microswabs™ by Texwipe™ are recommended.

6Gently wipe the connectors with a lint-free, non-abrasive wipe or pad. Texwipe™ pads are recommended.

*See safety precautions in next section.

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.