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Introduction
System installation
Once determined, the locations must be observed precisely in order to obtain re-
producible results. There are always surprising effects in practice, due for example
to cells being set up with several radio units (rather than the one cell originally
planned and surveyed). If for example masts are used as mounting structures and
fitted on both sides with radio units, conditions on either side of the mast will be
different.
Re-measuring the Installed System
Before the system can be handed over to the customer, the measurements need to
be verified and compared with the values of the original measurement (see
"Re-
measuring", page
46).
Documentation
The system documentation is an essential requirement. This applies to both the
planning and the execution phases. To this end all the data is recorded and set out
in a final written version. Modifications and updates must also be documented.
This documentation can then be used as reference in the event of project exten-
sions, enquiries or other matters.
Aastra 400 DECT System
The Aastra 400 DECT system allows users to make and receive telephone calls any-
where on the company premises without being tied down by hard-wired sets. Sev-
eral radio units form a network of coverage ranges within which a user is able to
move freely.
The components of an Aastra 400 DECT system comply with the conditions of the
"Digital Enhanced Cordless Telecommunications"standard (DECT). This standard
regulates in particular the conditions on the high-frequency radio link and the sig-
nalling between cordless phones and radio units.
Besides cordless phones it also possible to operate the installation using products
that support the GAP (Generic Access Profile) standard. GAP defines a restricted
functionality, thereby also supporting the cordless phones of other manufacturers.
GAP cordless phones cannot be used for measuring purposes.
DECT radio units and cordless phones
One or more radio units are required to be able to operate DECT cordless phones
on the Aastra 400 communication servers. They are connected to one or two DSI
interfaces. They are powered either via the DSI bus or locally using separate plug-in
power supply units.
18
Planning Aastra 400 DECT systems as of R1.0
syd-0457/1.0 – R1.0 – 10.2012
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