Allied Telesis CentreCOM AT-MR415T Installation Manual page 16

Product Description
In other words, the LED is lighted anytime a valid communications
link has been established for the corresponding port. If the LED is
not lighted, check the twisted pair cable to ensure a proper port
connection has been made.
ACTIVITY lamp (green)
— This LED is lighted when packets are being sent or received
through the repeater.
COLLISION lamp (amber)
— The COLLISION LED will flicker to indicate a collision. While
occasional collisions are normal in Ethernet networks, a constantly
illuminated COLLISION LED may indicate that there is a port
with excessive traffic problems.
— Continual flickering of the COLLISION LED may also indicate
excessive frame collisions on a segment. This may be caused by an
overloaded segment, a faulty cable, or a bad connection.
— If this LED is lighted for an extended period of time, it is possible
that there is a problem with the transceiver or cable.
POWER lamp (green)
— This LED lights when power is being received by the repeater from
the AC to DC adapter.
Figure 4 shows the back panel of an AT-MR815T.
On the back panel are eight UTP RJ45 network ports (including Port 8, an
uplink port). It also shows the Direct Current (DC) power receptacle which is
used in conjunction with the TUV-licensed Alternating Current (AC) adapter
which is provided.
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Figure 4: AT-MR815T back Panel