Allied Telesis AT-MCF2012LC/1 - Manual (Page 24)

Chapter 1: Overview
24
“L” Link
LED
The twisted pair ports and fiber optic ports also have a Link
(L) LED, shown in Figure 6, for displaying the link status of a
port to its networking device. The meaning of a Link LED
can vary depending on the operating mode of a channel.
Consequently, you should first determine a channel’s
operating mode before deciphering the Link LEDs of a
channel’s two ports. It can also prove useful to consider the
Link LEDs of the two ports of a channel as a pair and to
view them as a unit.
For background information on the operating modes, refer
to “Channel Operating Modes” on page 31. For information
on viewing and setting the operating mode of a channel,
refer to “Mode Selection Button” on page 36.
Figure 6. “L” Link LEDs
Link LEDs and the Link Test Mode
The Link LED of a port in a channel set to the Link Test
mode reflects the current status of the link between the port
and its networking device. The Link LED is on when the port
has a link to its networking device and off when the port
does not have a link. For more information on this operating
mode, refer to “Link Test Mode” on page 31.
Table 3 lists the combinations and definitions of the Link
LEDs for the twisted pair port and fiber optic port of a
channel operating in the Link Test mode.
L
A
L
A
CH
CH
CH1
CH2
TX RX 1
TX RX 2
3
4
CDC FDC
A L A 1
L A 2
3
4
A
T
-MCF2012LC
Twisted Pair Port
Link LED
Fiber Optic Port
Link LED