Allied Telesis AT-MCF12VF, SM - Manual (Page 12)

Overview
4
Each twisted pair port has one LED labelled T-LNK that indicates whether or
not a link has been established between the port and the node connected to
the port. Each fiber optic port has two LEDs, one labelled F-LNK that lights
when a link has been established with the node connected to the port and
another LED labelled Active that lights when the port is receiving traffic.
Table 3 lists the functions of the port LEDs.
MAIN Green
Flashing Green
The main power supply is functioning normally.
The main power supply is failing or has failed.
BCKP Green
Flashing Green
The optional redundant power supply, if installed, is
functioning normally.
The optional redundant power supply, if installed, is failing
or has failed.
NORM Green The unit is not performing a link test.
TEST Amber The unit is performing a link test on the fiber optic ports
associated with the Link Test switch.
Table 3 Port LEDs
LED Color Indicates
T-LNK Green A link exists between the twisted pair port and the node to
which the port is connected.
F-LNK Green A link exists between the fiber optic port and the node to
which it is connected.
ACTIVE Flashing
Amber The fiber optic port is receiving data.
Table 2 Power Supply and Link Test Switch LEDs
LED Color Indicates