Allied Telesis AT-9900s manual Checking LEDs, Led, Psu

AT-8900, AT-9900, AT-9900s Series Switches

5.Change the password.

Change the password as soon as possible because a manager account with the default password is a serious security risk. Remember the new password because there is no way to retrieve it if you forget it.

To change the account password, use the set password command.

6.Display help for commands as necessary.

To display a list of help topics, use the help command.

To display help on a specific topic, use the help <topic> command.

Alternatively, display a list of valid options by typing a question mark at the end of a partial command.

Checking LEDs

Table 1 describes how LEDs on the switch report faults and operational activities.

Table 2 on page 14 describes how LEDs on power supply units and fan-only modules report faults and operational activities.

LEDs for Ethernet ports and Small Form Factor Pluggable (SFP) ports are described in the Hardware Reference.

Table 1: System LEDs

LED	State	Description
PSU 1	Green	PSU 1 is installed and supplying power to the switch.
		The voltage output is within specification.
	Red	PSU 1 is installed in the switch and has exceeded its
		recommended temperature threshold of 75º C
		(167º F), or the fan has failed.
		A FOM is installed in the switch and has failed.
		The bay is empty.
	Off	A FOM is installed and operating at an acceptable
		speed.
		For AT-9924T and AT-9924SP models, this LED is
		always off because a FOM is not required.

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