D-Link DIR-2055 User Manual page 77

Section 3 - Configuration
This Quality of Service (QoS) Engine will allow you to prioritize particular
clients over others, so that those clients receive higher bandwidth. For
example, if one client is streaming a movie and another is downloading a
non-urgent file, you might wish to assign the former device a higher priority
than the latter so that the movie streaming is not disrupted by the traffic of
the other devices on the network.
Under Connected Clients, you will see device cards representing each
connected client. If some are off-screen, you can use the < and > buttons to
scroll through the cards.
A maximum of one device can be assigned Highest priority.
A maximum of two devices can be assigned High priority.
A maximum of eight devices can be assigned Medium priority.
If no devices are explicitly assigned a priority, they will all be treated with
equal priority. If some devices are not assigned a priority and others are, the
unassigned devices will be treated with the lowest priority.
To assign a priority level to a device, drag the device card from the All
Devices list over an empty slot and release the mouse button. The card will
remain in the slot. If you want to remove a priority assignment from a device
and return it to the All Devices list, click the cross icon in the top right of the
device card.
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