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Page 6 - Site Surveys
Site Surveys
Introduction
A site survey is performed using a separately supplied Site Survey Kit.
A site survey is the most crucial part of any Compact DECT installation.
It is the stage at which future success or failure of the installation will
probably occur.
Most issues of customer satisfaction will stem from the site survey and the
resultant positioning of the base station and the Repeater(s) (see page 20).
From the customer's point of view, two keys factors must be assessed:
– The area of coverage required:
– The number of simultaneous users within different areas:
During the site survey, you will be attempting to determine three factors to
achieve the customers requirements:
– The best positioning of the CDBS
– The number of Repeaters required.
– The best positioning of the repeaters.
To fulfill this you need to obtain the following details:
– Building Measurements:
– Signal Strength: (RSSI - Radio Signal Strength Indication)
– Speech Quality: (Q52)
Page 6
Introduction
A CDBS can support 6 simultaneous calls. Where Repeaters are used,
they support two simultaneous calls, but these are 'borrowed' from the
CDBS. Hence, each call routed via Repeaters reduces the number of calls
that the CDBS can handle.
Accurate building plans are an essential aid to both the site survey and
also for later fault analysis.
From potential base station positions, what is the range of the base station
signal at sufficient signal strength for reliable operation.
Interference, weak signals and reflected signals lead to errors in the digital
signal that cannot be corrected. From potential base station position, what
is the range before the bit error rate becomes unacceptable.
Compact DECT - Installation Manual
38DHB0002UKFH – Issue 5 (27th October 2003)
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