D-Link DES-1526 - Manual (Page 41)

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Speed/Disable:
This setting has six modes— 100M Full, 100M Half, 10M Full,
10M Half, Auto, and Disable— for speed or port disable
selections.
Flow Control:
This setting determines whether or not the Switch will be handling
flow control. Set FlowCtrl to Enable for avoiding data transfer
overflow. If it is set to Disable, there is either no flow control or
other hardware/software management.
When the 10/100M port is set to full-duplex mode, then the flow
control will be automatically set to disable; and if the 10/100M
port is set to half-duplex mode, the flow control will be
automatically set to enable.
QoS:
In some ports that need to have a high priority to manage the data
transfer, QoS should be changed. Set the port’s QoS to high to
determine the port will always transfer their data first.
802.1Q VLAN Settings (Virtual Local Area Network)
A VLAN is a collection of switch ports that make up a single
broadcast domain. You can configure a VLAN for a single switch,
or for multiple switches. When you create a VLAN, you can
control traffic flow and ease the administration of moves, adds,
and changes on the network, by eliminating the need to change
physical cabling.
On VLAN settings, there are two main settings, VID Table Setting
and Port VLAN Setting.