Initial Rough Determination Of The Radio Unit Locations - Aastra Ascotel IntelliGate A150 System Manual

3.4.2

Initial rough determination of the radio unit locations

Radio circumstances are difficult to estimate. For this reason, situations regarded as
particularly critical need to be determined on site through measurements. This will
provide a reliable idea of the equipment required and the locations for the radio
units.
The following rules of thumb may be of help:
• Good connections still possible in a horizontal direction behind 2...3 ordinary
brick walls; barely any penetration through concrete floors and ceilings in a
vertical direction and in ground floor or basement floors, i.e. each storey must be
supplied separately. A certain amount of vertical penetration can be expected
from the first floor upwards; generally speaking, radio propagation conditions
improve as the distance from the ground increases.
• Openings in obstacles improve radio conditions.
• Subsequent furnishing: In empty buildings, the effect of the absence of furniture,
machines, partitions, etc., and their room limitation needs to be taken into
account. Subsequent extensions and conversions also have an influence.
• It is important to ensure sufficiently large overlap zones between neighbouring
coverage ranges. The signal should not be too weak that it prevents automatic
handover to the next radio unit. Here, it is necessary to find a solution between a
large number of radio units and a reasonable coverage of the premises.
• Radio range (guideline values)
– up to 30 m in buildings
– outdoors up to 250 m.
• Observe the minimum distance between radio units (see
Radio Unit Distances to the PBX
When planning a system it is important to note that with a SB-4 radio unit the power
supply can be provided from the AD2 bus for distances of up to 660 m (wire
diameter 0.5 mm). From 660 m up to the maximum for the AD2 bus of 1200 m, a
local power supply has to be provided with the recommended plug-in power supply
unit, d. h. you need to provide a 230 VAC connection.
A local power supply is not required for the SB-4+ / SB-8 / SB-8ANT radio unit as it
can be powered via the AD2 bus up to 1200 m.
Tip
:
The SB-4+ / SB-8 / SB-8ANT radio units can also be powered locally to
relieve the terminal power supply. This can also render the use of an
auxiliary terminal power supply superfluous.
Planning DECT systems
Ascotel® DECT System
Fig. 31).
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