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AT-9400 Series Gigabit Ethernet Switches Installation Guide
35
Port LEDs
The following sections describe the twisted pair and fiber optic port LEDs.
10/100/1000Base-
T Twisted Pair
Port LEDs
A twisted pair port has two LEDs labeled L/A (link/activity) and D/C (duplex
mode/collisions). The L/A LED indicates the speed and activity on a port.
The D/C LED indicates the duplex mode (full- or half-duplex) and the
status of collisions on the port.
Table 3 describes the LEDs for the 10/100/1000Base-T twisted pair ports.
Table 3 Twisted Pair Port LEDs
LED Function State Description
L/A Link Status
and Activity
Off No link is established between the
port and the end node.
Solid
green
The port has established a link at
1000 Mbps.
Flashing
green
Packets are being received or
transmitted at 1000 Mbps.
Solid
amber
The port has established a link at 10
or 100 Mbps.
Flashing
amber
Packets are being received or
transmitted at 10 or 100 Mbps.
D/C Duplex
Mode and
Collisions
Green The port is operating in full-duplex
mode.
Amber The port is operating in half-duplex
mode. (Only when operating at 10 or
100 Mbps.)
Flashing
amber
Collisions are occurring on the port.
(Only when operating at 10 or 100
Mbps, half duplex mode.)