3Com 1100 manual Led, Color Indicates

14CHAPTER 1: INTRODUCING THE SWITCH 1100

LEDs Table 3 lists the LEDs visible on the front of the Switch, and their states according to color. For information on using the LEDs for problem solving, see “Checking for Correct Operation” on page 30.

Table 3	LED behavior
LED	Color	Indicates
TCVR	Yellow	Port 1 is a Transceiver Module fitted to the rear of the
		Switch.
	Off	Port 1 is operating as a 10BASE-T port.
Port Status LEDs
Packet	Yellow	Packets are being transmitted/received on the port.
	Off	No packets are being transmitted/received on the port.
Status	Green	A link is present, and the port is enabled.
	Green flashing	A link is present, but the port is disabled.
	Off	No link is present.
Expansion Module Port Status LEDs
Packet	Yellow	Packets are being transmitted/received on the
		Expansion Module or Matrix Module port(s).
	Off	No packets are being transmitted/received on the
		Expansion Module or Matrix Module port(s).
Status	Yellow	A valid Expansion Module or Matrix Module is
		installed.
	Yellow flashing	An unrecognized Expansion Module or Matrix Module
		is installed.
	Off	No Expansion Module or Matrix Module is installed.
Unit LEDs
1–8	Green	The Switch forms a stack with other Switch 1100 /
		Switch 3300 units; the LED indicates the position of
		the Switch in the stack and that a link is present. Note
		that although there are eight LEDs, only four Switch
		units can be stacked at present.
	Off	The Switch is stand-alone.
Power/Self Test LED
	Green	The Switch is powered-up.
	Green flashing	The Switch is either downloading software or is
		initializing (which includes running a Power On Self
		Test).
	Yellow	The Switch has failed its Power On Self Test.
	Off	The Switch is not receiving power.