| Proximity
The Proximity system
allows telecommunications operators to construct
high quality telephone access networks between
customers’ premises and local exchanges.
The system uses cellular point to multi-point
wireless technology in place of traditional
copper-based local loops.
Each subscriber terminal is equipped with
two standard analogue telephone interfaces
to deliver PSTN circuit-switched services.
In addition, a packet-mode service may be
used to deliver ‘always-on’
connections between one or more Internet
Service Providers (ISPs) and the subscriber’s
computer equipment. The Proximity system
provides a frequency division duplex radio
link to a subscriber transceiver system
and operates in the 3.4 to 3.6 GHz licensed
bands. The air interface utilizes time division
multiplex on the downlink and time division
multiple access on the uplink.
The system has built up a strong reputation
for stable and reliable operation in a number
of deployment scenarios ranging from dense
urban to rural. Single networks with more
than 400,000 deployed lines are currently
in operation. A range of scalable base-stations
are available supplemented by a high performance,
high capacity radio management system.
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Fully transparent circuit switched
voice (32k ADPCM or 64k PCM) |
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‘Always on’ data
service offering subscriber data rates of 100kbps |
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Modular base-stations that can
be configured with capacities ranging from 17 Erlangs
to 376 Erlangs |
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A generous fade margin allowing
robust performance in non-line of sight deployments |
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In excess of 160dB link budget
when operating with base-station diversity |
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Range of Base-station interface
formats including ETSI V5.2 |
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Radio element manager capable
of managing in excess of 100,000 lines |
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