Allied Telesis AT-MR908TX - Manual (Page 42)

Troubleshooting
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Troubleshooting
Is the unit receiving power? Check the power (PWR) LED on the front of the
AT-MR908TX. This green LED should be illuminated.
If the power LED is not on, check both ends of the AC power cord. Make sure
the power cord is plugged into a functioning wall outlet and that it is properly
inserted into the AT-MR908TX power receptacle on the back of the unit.
Note
There is no “power” switch on the AT-MR980TX. If the power cord is
properly connected, the hub should be receiving power.
Is the Link/Activity LED illuminated? The Link/Activity LEDs on the front of the
AT-MR908TX will illuminate when a proper connection between the
corresponding 100Base-TX port and the equipment connected to it is
established. If this LED is not illuminated, check for the problems listed below
and make corrections as necessary.
1. Problem 1:
The cable has been cut, damaged, or is the wrong type of cable.
❑ Solution 1:
— Try making the connection with a different cable. Be sure you are
using an undamaged cable of the correct type.
2. Problem 2:
Connected equipment is not turned on or not operating properly.
❑ Solution 2:
— Check the connected equipment (computer, another hub, etc.) and
turn on the power.
3. Problem 3:
The MDI/MDI-X slide switch of the AT-MR908TX is on the wrong setting.
❑ Solution 3:
— When using the cascade port of the AT-MR908TX, you should set
the switch to MDI; otherwise, the switch should be in the MDI-X
position.
— When cascading two AT-MR908TX hubs, the unit using the cascade
port should have the switch set to MDI, while the other unit should
have its switch set to MDI-X.