User's Manual

Chapter 1 - System Description
BreezeACCESSS VL System Manual
1-6
Base Station Equipment
The Access Units, installed at the Base Station site, provide all the
functionality necessary to communicate with the Subscriber Units and
to connect to the backbone of the Service Provider.
There are 2 lines of Access Units with different architectures
! Modular Base Station Equipment
! Standalone “Micro-Cell” Access Unit
Modular Base Station Equipment
The Base Station Equipment is based on the BS-SH-VL 3U chassis,
which is suitable for installation in 19-inch racks. The chassis contains
one or two Power Supply modules and has 8 slots that can
accommodate BS-AU-VL Network Interface modules. These slots can
also accommodate various combinations of other modules, including
Network Interface (BS-AU) modules for Access Units operating in any of
the bands supported by BreezeACCESS equipment using GFSK
modulation, including BreezeACCESS II, BreezeACCESS MMDS,
BreezeACCESS XL and BreezeACCESS V. It can also accommodate a
BS-GU GPS and Alarms module to support GPS-based synchronization
of BreezeACCESS systems using Frequency Hopping radios.
Two different types of power supply modules are available for the
BreezeACCESS VL modules: The BS-PS-DC-VL that is powered from a
-48 VDC power source, and the BS-PS-AC-VL, powered from the
110/220 VAC mains. The optional use of two power supply modules
ensures fail-safe operation through power supply redundancy. When
the same chassis is used also for Access Unit modules belonging to
other BreezeACCESS families using GFSK modulation, then one BS-PS-
VL power supply (AC or DC) should be used to provide power to the
BreezeACCESS VL Access Units, and a different power supply module,
suitable for GFSK equipment, is required for powering the
BreezeACCESS GFSK Access Units.
Each BS-AU module, together with its outdoor AU-D/E-BS-ODU radio
unit and an antenna comprise an AU-D/E-BS Access Unit that serves a
single sector.
The AU-D/E-BS-ODU outdoor unit contains the processing and radio
modules and connects to an external antenna using a short RF cable.
E model units are supplied without an antenna.