User Manual

AS4000 Wireless Local Loop
System Overview
GSI 001
605-0000-430
Issue 1.2 Date 7/4/99
Page 8 of 16
Antenna Feeder
AS4000
Central Terminal Rack
Antenna
ACC
AS4000
To Host Network
Network Interface (2Mbit/s)
Figure 6. Central Terminal
The antenna and feeder sub-system consists of a two stacked dipole -high gain omni-
directional antenna assembly mounted on a pole or mast and low-loss coaxial feeder cables
which connect the antennas to the CT equipment rack.
The AS4000 Central Terminal Rack is a 2.2m high ETSI practice equipment rack which
contains multiple shelf assemblies. These house the equipment necessary to support up to
60 customer radio links and from one to four 2 Mbit/s links to the Local Exchange (LE).
8 Subscriber Terminals (ST)
The ST is apparatus that is installed in the customer’s premises. This unit terminates the
radio link and provides the CPE interface. There are a number of options for ST apparatus.
8.1 Subscriber Terminal V2 (ST-V2)
The ST-V2 provides two voice grade Voice Frequency (VF) circuits, suitable for
Telephony, Fax, and Data Modem CPE. This unit is partitioned into 3 distinct physical
modules known as the Customer Radio Unit (CRU), the Network Terminating Unit (NTU)
and the AC Power Supply Unit (ACPSU). Four types of AC power supply units are
available: