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Gigaset N870 IP PRO / LUG IE-UK_IM en / A31008-XXXXX-XXXX-X-XX / measure.fm / 8/24/18
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Taking measurements
•
In order to be able to recognise subsequent changes, it is helpful to document the planned
assembly positions of the individual measurement series and their environment with
photographs.
•
If the DECT system is to be used for several floors or very high rooms (e.g., with a gallery),
you must also measure the vertical range and enter it in a plan of the building. For further
information on this, please also refer to the DECT installations in special environments
chapter
Fluctuations in the measurement result
When you are performing the measurements, the signal strength displayed on the handset can
fluctuate strongly, particularly if you are moving around with the handset. The base stations
have two aerials, so the handset displays the values for the aerial for which it receives the best
signal. Since the measuring handset takes measurements at defined time intervals (2.5 seconds
as standard), the values can change quickly.
For example, if you block the signal for the aerial that is in a better position for the handset with
part of your body, the handset receives the signal from the weaker aerial. Turning your body
slightly can significantly alter the measurement value, since the handset is suddenly able to
receive the signal from the "better" aerial. By moving around, you determine an average value
that you can use as the measurement value.
In case of marked fluctuations it makes sense to perform the measurement while a connection
is established as you then have an additional check based on voice quality.
When the DECT system is being operated in real-life situations, these fluctuations are barely notice-
able as the base stations automatically establish the connection with the best positioned aerial.
Defining thresholds
During the measurement process, the measuring handsets receive wireless signals from the
measuring base station and display various characteristics for the reception quality. The following
are relevant for the reception quality:
•
Reception power
•
Connection quality
The values specified below are guidelines for determining thresholds for operating the DECT
telephone system under optimum conditions. Since the DECT network can be restricted by
many factors that can also occur temporarily, we do not recommend positioning the base
stations at the thresholds. Instead, you should include a buffer according to the requirements for
grade of service and voice quality. It may be acceptable for example, that voice quality
is restricted at times in the basement, and that calls cannot always be made there. In contrast,
restrictions are unacceptable for meeting rooms where telephone conferences are held.
