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Chapter 1 - System Description
BreezeACCESS VL System Manual
4
1.2 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
1.2.1 Modular Base Station Equipment
The Base Station Equipment is based on the BS-SH 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 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 that is powered from a -48 VDC power source, and
the BS-PS-AC, 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 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 and its outdoor radio unit (AU-ODU) comprise an AU-E-BS
Access Unit that together with an external antenna serves a single sector. There
are two types of Access Units, differing in the maximum number of Subscriber
Units that they can serve: