Compex Systems 802.11N - Manual (Page 13)

Repeater WDS Mode
Repeater WDS Mode to mainly to extend the wireless range and coverage of the
wireless network allowing access and communications over places generally
difficult for wireless clients to connect to the network.
In Repeater mode, the access point acts as a relay for network signals on the
network by regenerating the signals it receives, and retransmitting them to main
network infrastructure.
Detailed information on the Repeater mode is available in the Repeater Setup
section.
** Note: Repeater WDS requires the access point to be setup in RootAP or
Access Point WDS mode to work.