Allied Telesis AT-MR815T - Manual (Page 30)

Troubleshooting
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4. After confirming that port 1 and port 2 are operational, remove the power,
reconnect one of the computers to another port, turn the power back on,
then repeat the communications test of step 3. Do this with all of the ports
of the AT-MR415T/AT-MR815T Micro Repeaters. When testing the cascade
port, connect the port to a computer and select MDI-X using the MDI MDI-
X toggle switch.
5. Verify the connection in each port by checking the LINK ON lamp and
performing the communications test as described in steps 2 and 3.
6. Once each port of a single AT-MR415T/AT-MR815T Micro Repeater has
been tested, check the connection between computers of two different
repeaters (if your configuration has more than one repeater). For example,
perform the communications test described in step 3 between PC A and PC
C, then PC B and PC C. When cascading repeaters, select cascade mode on
one repeater by selecting MDI using the MDI MDI-X toggle switch.
Troubleshooting
Is The Unit Receiving Power?
Check the POWER lamp on the front of the AT-MR415T/AT-MR815T Micro
Repeater; this green LED should be lighted.
If the POWER lamp is not lighted, check both ends of the AC adapter. Make
sure the AC adapter is plugged into a functioning wall outlet and that the DC
plug is properly inserted into the AT-MR415T/AT-MR815T Micro Repeater DC
Power Jack on the back of the unit.
Note
Power to the hub must be sourced only from adapter in the package or
direct plug in type approved adapter rated 7.5Vdc, 500mA.
Note
There is no “power” switch on either the AT-MR415T/AT-MR815T
Micro Repeater or AC adapter. If the AC adapter is properly
connected, the repeater should be receiving power.