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DECT installations in special environments
DECT installations in special environments
chapters describe all pre-
requisites and steps for planning a DECT network. In addition to the examples and appli-
cations described there, this chapter contains notes for special construction or topo-
graphical requirements.
DECT networks over several floors
If the DECT network is to cover several floors of a building, you must consider the follow-
ing points when planning the number and location of base stations:
u
What material are the suspended ceilings made from?
If they are reinforced concrete, only one ceiling can be positioned between the base
station and telephone for a direct wireless path. Furnishings and partitions in rooms
etc. can restrict the wireless transmission even further.
Use measurements to check where further base stations are required.
u
To what extent must a handover between the floors be guaranteed?
In this case, the base stations must be positioned such that stairwells are also com-
pletely covered. Note also that any fire doors or walls can reduce the wireless transmis-
sion severely.
Add the vertical levels of your planned coverage areas to your measurement plan and
record the vertical transmission of the DECT network.
u
No handover between floors required
In this case you can work with clusters (more cost-effective). If you set up one cluster
for each floor, the base stations of the cluster are synchronised with one another and
a handover is possible. A handover is not possible between the floors, but the IP PABX
functions (VoIP configuration, directories, etc.) are available in all clusters.
Stairwells and lifts
Stairwells often have particularly absorbent walls (e.g., reinforced concrete); access to the
stairwell may be restricted by fire doors. Planning of the DECT network is therefore sub-
ject to special requirements here.
If you want calls via the DECT network to be possible in the stairwell, the most cost-effec-
tive variant is to install one (or even several) base station as a separate cluster.
If a handover is required in the stairwell, you should check the position of the stairwell to
the corridors (transitions, doors, fire doors), measure the wireless coverage and, if neces-
sary, provide one or more base stations for wireless coverage of the stairwell.
Making calls in lifts is usually not possible due to the highly absorbent and/or reflective
materials. However, if this is a requirement, you can check whether you can achieve suffi-
cient signal strength and quality for making calls in a lift by installing a separate base sta-
tion in the lift shaft.
VoIPon www.voipon.co.uk [email protected] Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
