HP 530 Management Manual page 288

Special Features
Wireless Distribution System (WDS) and Spanning Tree Protocol (STP)
Figure 8-5. WDS Links with AP Repeater to Remote Access Point
8-18
You can also configure the Access Point 530 to use WDS links in a multiple-
hop configuration, as shown in Figure 8-5.
In this configuration, the intermediate access point serves as a "repeater," to
bridge wireless traffic between an access point with an Ethernet connection
and a more remote access point on the other side. All three access points in
this configuration can support wireless stations in addition to bridging
network traffic between one another.