User's Manual

PAS System
1
Overview
1. Overview
ACS (Adaptive Cell Station, i.e. ACS) is a kind of wireless equipment. The
ADPCM signals from the RPCACS controller enter into the standard 2B+D
interface via twisted pair wire; The signals are transmitted in the form of radio
frequency modulation wave, which makes up a wireless link between the ACS
and PS (Personal Station). The link provides voice/data communications to
terminal subscribers via RPC, central terminal equipment and central switch
office. In terms of wireless communication, the ACS provides RCR STD-28 air
interface.
It applies Time Division Multiple Access (TDMA) and Time Division Duplex
(TDD) techniques. Each individual radio link between the ACS and FSU/PS is
assigned 1 time slot for a control channel (C-Ch) and 3 time slots for traffic
(speech) channels (T-Chs). The C-channel time slot of RCR STD-28 does not
need to be specially located, so, in the system, any one of the 4 time slots can be
selected as the control time slot.