Aironet Lan Adapter - Manual (Page 24)

Welcome to the Aironet 4000 Series Wireless LAN Adapter
1-10
Power Saving Protocol (PSP) and Non-Power Saving
Protocol – The Power Saving Protocol allows computers
(usually portable computers) to power up only part of the
time to conserve energy. If a client node is using the Power
Saving Protocol to communicate with the network, the
Aironet Access Point must be aware of this mode and
implement additional features such as message store and
forward. If the client node is powered from an AC line, PSP
should not be used.
Repeater – A repeater is an Access Point that extends the
radio range of the infrastructure. A repeater is not physically
attached to the wired LAN, but communicates via radio to
another Access Point, which is either a root unit or another
repeater.
Root Unit – The root unit is an Access Point that is located
at the top, or starting point, of a wireless infrastructure. A
root unit provides the physical connection to the wired LAN
(such as Ethernet or Token Ring) and contains configuration
information in its association table that covers all nodes that
access the wired network (backbone). All Access Points
directly attached to the wired LAN backbone are root units.