User Manual

Demand Assignment
System Overview GSI 002
605-0000-450
Draft Issue 1.3dr Date 8/02/00
Page 1 of 16 © Copyright Airspan Communications Corporation 1998
SYSTEM OVERVIEW
1. AS4000 Overview
The AS4000 Wireless Fixed Access System is a digital point to multipoint radio access
system providing wireless access for fixed subscribers to the telecommunication
network. AS4000 delivers telephony, voice band facsimile/data, and leased line Data,
providing the same functionality as “copper pairs” and is therefore a direct alternative to
the use of copper cabling for the delivery of these services to customers.
The system uses Point-to-Multipoint radio links between the individual customer’s
premises and the carriers “local point of presence” as a replacement for the copper pair
“local loops ”. The “local point of presence” is typically the Local Exchange premises.
If greater flexibility or range is required, the network radio equipment can be located in
another suitable building or wayside cabinet.
The AS4000 System provides a substitute or replacement for the more traditional
copper-pair local loop. Thus, line plant maintenance costs are eliminated, and digital
services can be rapidly deployed to new residential and business customers.
Each individual customer location is served by one or more 144 kbit/s radio links,
which can be configured to support a range of services, up to four analogue telephony
circuits, or ISDN basic rate access.
The “Demand Assigned” Radio interface makes a temporary call by call assignment of
channels, to Subscriber Terminals. This allows for the provision of graded service
making more efficient use of the radio channels. The radio interface differs in that links
are allocated as either traffic, or as control channels. Traffic channels can also be
allocated as normal access or priority channels. Priority channels are set to provide
access to emergency services when system channels are being fully used.