Compex WP54AG - Manual (Page 123)

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Chain Configuration WDS
A chain configuration WDS spans an area in length, for instance a long corridor.
Satellite access points are chained together starting from a root access point.
The access point at either end of the chain will have only one WDS link
enabled, while the access points in the middle will have two WDS links
configured to associate with the neighboring Access point upward and
downward in the chain.