D-Link DES-1252 - Manual (Page 45)

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Figure 301 – Configuration > 802.1Q VLAN > VID Assignments
Configuration > Trunking
The Trunking function enables the cascading of two or more ports for
a combined larger bandwidth. Up to six Trunk groups may be created,
each supporting up to 8 ports. Add a Trunking Name and select the
ports to be trunked together, and click Apply to activate the selected
Trunking groups.
Figure 312 – Configuration > Trunking
NOTE: Each combined trunk port must be connected to devices
within the same VLAN group.