Planet DHR-800 User Manual page 17

that the correct cable type is being used. (Note that crossover
cable is only required if you cascade hubs via RJ45 station
ports, i.e. an Uplink port is not used.) Replace the defective
cable or adapter.
Some network adapter's link indicator need to be initialized by
software driver. Therefore, if no driver is pre-loaded, the hub's
link indicator will remain off even the connection completed.
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DHR-800/DHR-800P User's