iMac, Power Mac G4 Cube: Issues with Nortel Baystack switch

Symptom

When data is sent to an affected computer connected to a Baystack switch:

• The link light on the switch intermittently blinks (as the link is dropped, then brought back up).
• Network performance is poor.
• The Macintosh system.log has many "Link is down" and "Link is up" entries.

Products affected

• iMac (15-inch Flat Panel) 700 MHz and 800 MHz
• iMac (17-inch Flat Panel) but not the "17-inch 1GHz" model
• Power Mac G4 Cube
• Nortel Baystack 5510-24T and 48T

Solution

Update the firmware of the affected switch to version 4.0.0 or later, available from the Nortel website.

Important: Information about products not manufactured by Apple is provided for information purposes only, and does not constitute Apple's recommendation or endorsement. Please contact the vendor for additional information.