User Manual

WipLL System Description
6-2 of 6-12 Issue 03
4Mbit - Draft 05
1QDF10134AAP-SYD-FCC
SPR
Subscriber
Adapter
Video
Conferencing
Figure 6-2: Typical Subscriber Site
6.2. SPR/BSR Communications
The SPR transmits and receives data to and from the base station. It is typically
located on the roof or external wall of the subscriber premises. The SPR has the
reference number of the Base Station Radio (BSR) coded into it. This prevents the
SPR from being removed and placed at a different location without authorisation.
The SPR contains a high-gain directional antenna. The standard 2.4Ghz model
covers an area of 23 degrees with a gain of 15dBi
At the network layer, the SPR performs routing functions between the subscriber's
Ethernet network and the wireless network and contains a routing table that can
support up to 16 entries.
The transport layer of the SPR makes decisions on how to support an application in
terms of bandwidth, delays and mode of operation. There are two modes of
operation - pre-emptive polling and Time Division Multiple Access (TDMA). The
BSR's admission control makes the decision on which mode each unit of the cell
will operate at a given moment.