User Manual

Demand Assignment
System Overview GSI 002
605-0000-450
Draft Issue 1.3dr Date 8/02/00
Page 10 of 16
3. The Access Concentrator
The Access Concentrator (AC) is required when AS4000 is operating in “Demand
Assigned” mode to de-multiplex the traffic concentrated on the air-interface for
presentation to the network switching equipment. The Access Concentrator provides
CAS, V5.1 or V5.2 network interface with the Local Exchange. Also in system versions
using 32kbit/s ADPCM compression the decompression to 64kbit/s is performed within
the AC.
Alarms and
Breakers
Access
Concentrator 1
Cable Interface
and Cards
Access
Concentrator 2
Cable Interface
and Cards
Figure 4. Access Concentrator Rack with two AC Units