3Com AirConnect 9550 User Manual page 50

46 System Configuration
WDS is incompatible with WPA. Both features cannot be used at
the same time. A WDS link is bi-directional, so the AP must know
the MAC address of the other AP, and the other AP must have a
WDS link back to the AP.
Dynamically assigned and rotated encryption keys are not
supported in a WDS connection. This means that WPA and other
dynamic key assignment technologies may not be used. Only
Static WEP keys may be used in a WDS connection, including any
STAs that are associated with a WDS repeating AP.
Enter the MAC address of the other APs you want to link to and
click enable.