Specifications

Hardware Reference 25
C613-03075-00 REV A
System LEDs
AT-8948 Port LEDs
Table 9: System LEDs found on all AT-8900 Series Switches.
LED State Function
PSU 1 Green PSU 1 is installed and supplying power to the
switch, and voltage output is within
specification.
Red PSU 1 is installed in the switch and a fan has
failed, or the PSU has exceeded the
recommend temperature threshold of
75º C
(
167º F).
A FOM is installed in the switch and a fan has
failed.
Not lit A FOM is installed and fan is good, or the bay
is empty.
PSU 2 Green PSU 2 is installed and supplying power to the
switch, and voltage output is within
specification.
Red PSU 2 is installed in the switch and a fan has
failed, or the PSU has exceeded the
recommend temperature threshold of
75º C
(
167º F).
A FOM is installed in the switch and a fan has
failed.
Not lit A FOM is installed and fan is good, or the bay
is empty.
Fault Red The switch or management software is
malfunctioning
1 Flash A switch fan has failed or is operating below
the recommended speed
6 Flashes The switch’s temperature has exceeded the
recommended threshold
CF Green The compact flash memory is active. Do not
eject the flash memory module
Table 10: SFP Port LEDs on the AT-8948.
LED State Function
L/A
(Link activity)
Green A 1000 Mbps link is open. The link is operating
in full duplex mode.
Flashing green 1000 Mbps full duplex activity is occurring.
SFP
(status)
Green A SFP transceiver is installed.
Flashing amber A SFP transceiver is installed but there is a
transmission fault.