Security System Overview
The Infra-Com mobile communications systems offer high quality voice
communications where the area of reception is contained totally within a
defined envelope. The true cellular approach of the Infra-Com digital mobile
voice system allows exact areas to be covered, which can be increased or
reduced at any time by adding or removing antennas.
The low powered infra red does not penetrate walls and cannot be detected at
any distance, making it ideal for confidential communications. In addition it
is virtually impossible to jam and is not susceptible to radio, radar or
electrical noise. Because of the absence of signal radiation in the radio bands
both the fixed and mobile equipment will not cause any interference with other
electronic equipment. Additional channels can be added up to the maximum of 8
in any one cell.
Each
antenna has a controlled footprint of communication and many antenna can be
simply inter-connected for a system of the desired size.
When used in a control centre up to 8 full duplex channels can be provided.
Each of these channels allows full split headset operation where the operator
can receive two independent signals at the same time. Alternatively, the system
can be configured to provide a communications cell associated with only an
individual desk or location.
The versatile lightweight headset mounted transceiver can be used with
virtually any headset if the standard types are not acceptable. In a control
centre or room environment the operator can receive telephone and radio calls
simultaneously and can choose to which to reply, while maintaining complete
freedom of movement.
There are no licence requirements. .
In summary:
The
low level infra red digital encoding eliminates ocular hazards while providing
exceptional coverage with multi-channel capability. The ability to employ
virtually unlimited infra red antennas, from one base station, ensures coverage
over large areas. The use of encoding similar to CCITT G.711 guarantees
outstanding quality of low noise voice communications which is full duplex on
each channel. Side tone is generated in the base station giving complete
confidence that communication is being achieved.
Mobile operators can communicate between each other or with external
communication systems. The enhanced option allows for selective communications
between a mobile user and either internal or external radio communications
while receiving independent communications in each ear. This enhanced option
also allows for broadcast communication to be received and local two way
communications to be used independently, with the two communications channels
in different ears.
Interference from electrical equipment is eliminated by the use of digitally
encoded infra red, allowing two way full duplex voice communications to
continue in the most arduous electrical environments. Furthermore the use of
low level infra red ensures that sensitive electronic equipment is not effected
by the use of the system even when in close proximity.
Small fixed Infra red antennas receive and transmit data between mobile users
and the Base Station. These antennas are connected on simple "daisy
chain" wiring throughout the area of coverage. This allows for a simple
low cost installation which can be readily extended to cover additional areas
as required, which can be undertaken by unskilled personnel. Using the maximum
number of antennas areas up to 7500 square metres (75,000 square feet) can be
covered by a single system.
A belt mounted battery pack carries the operator interface controls. These
controls include the on/off switch, channel selection, volume control and press
to talk button.
Although providing extensive life the battery pack can be rapidly removed and
replaced with a recharged unit. A six channel conditioning battery charger is
provided which can fully recharge a spent battery pack in under 2 hours.
Alternatively a low cost simple battery charger is available which recharges a
single battery pack.
The whole system has been designed for high reliability and availability with
all MTBF calculated to the MIL-HDBK-217F.
The system has been designed to meet and has been extensively tested for both
the lack of sensitivity to and the emission of electro-magnetic radiation and
is capable of withstanding severe energy pulses associated with radar and
similar equipment. The equipment has been independently tested for
environmental conditions, shock and vibration.
Click here for more information:-
Infra Red
Mobile Equipment
Base Station
Infra Red Antenna
Battery Charger
To E-mail Azdec: Azdec Ltd
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