LevelOne EHU-0507T, User Manual

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such as another hub or an Ethernet switch, you should use a
crossver cable, or make the connection using the Uplink jack.
Uplink Jack
The Uplink jack is an MDI-II jack, which means you can
connect the hub (or a hub stack) to a device with an MDI-X
port using an ordinary straight-through cable, making a
crossover cable unnecessary.
Port1 and the Uplink port is really the same port, except thar
their pinouts are different.
Do not use both Port-1 (1X) and
the Uplink port at the same time.
Power Jack
For the External power adapter.