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3
Chapter
A site survey is required to define the number and the location of DECT base stations (DBSs)
needed to cover the area of a site adequately.
Considerations
Due to the nature of radio waves, wireless telecommunication, to a large extent, depends on the
environmental characteristics of a site.
ignal strength of radio waves transmitted from a DBS should be measured at several
! The s
points carefully. The results can then be recorded in the form of contour lines on the site map.
A great deal of time and effort can be saved if simulation devices or measuring devices are
!
available.
If no measuring devices are available, the DBS and an Office DECT 8000 handset can be used
!
to measure the strength of radio signals.
All the test results should be kept safely for effective maintenance of the site.
!
Environmental Considerations for Users
Environmental Considerations for Users
Environmental Considerations for Users a a a a nd Buildings
Environmental Considerations for Users
Carefully
rack the movement of users to establish movement patterns.
!
t
he number of DBSs required is determined by the number of users.
! T
The distance between DBSs should be at least 3m to avoid interference.
!
tween DBSs shorter the more frequently users move while in conversation.
Do not install a DBS where it could spoil architectural features.
!
! Consider ease of maintenance when installing a DBS.
Other Considerations
Other Considerations
Other Considerations
Other Considerations
There should be at least one DBS with an RSSI (Receive Signal Strength Indicator) value
!
greater than A0 (hex) at some location within the service area for DECT users. Refer to Table 1.
Site Survey with Office DECT 8000
Table 1: RSSI Values
RSSI Value (Hex)
C0 ~ FF
A0 ~ BF
90 ~ 9F
~7A
nd Buildings
nd Buildings
nd Buildings
Voice Quality
Good
Satisfactory
Poor
Call disconnection
3–1
distance be-
Keep the
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