Intel A21721-001 10/100 Ethernet Troubleshooting, Power-up Problems, Possible, Symptom, Cause

C H A P T E R 3 Intel® NetStructure™ 6000 Switch Modules User Guide

10/100 Ethernet Troubleshooting

Power-up Problems

The following table is a quick guide to power-up problems, their possible cause, and a suggested course of action.

	Possible
Symptom	Cause	Course of Action
No Link LED after	Bad or improper	Check cable. 100Mbps
plugging in a cable.	cable type.	link requires Category 5
		cable. Hub-to-switch or
		switch-to-switch
		connection must be made
		with a “crossover” cable.
		Check patch cables
		especially. Never use
		“silver satin” telephone
		patch cables. The total
		length of the cable should
		be less than 100 meters
		(328.1 feet) including
		patches.
	Ports are	The switch’s default link
	configured	connects with any
	improperly.	properly operating link.
		However, a port can be
		configured to link without
		auto-negotiation into one
		of several configurations.
		If plugged into a port that
		has been configured
		differently, the link might
		not connect or might not
		work properly. For
		example, a full-duplex
		port connected to a half-
		duplex port might have
		many frame errors.The
		best solution is to use the
		ports in auto-negotiation
		mode with properly
		functioning devices
		plugged into them.

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