Description varix 200/varix 14 (DECT)
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2 Planning a cordless communications network
Where are existing cable channels situated?
The locations for installing FPs should depend primarily on find-
ing favourable propagation conditions. That is to say that they
should not necessarily be positioned near existing cable chan-
nels. Thus, branch lines leading from the cable channels to the
FPs should be planned and installed. Refer to Figures 2.5 and
2.6. In determining the location of an FP, a footprint measure-
ment has priority over the position of existing cables.
Are there cables already in place?
Ensure that existing cables are telephone lines with a minimum
wire diameter of 0.6 mm. If not, new cables will have to be
installed.
Where are patch panels located?
It should be observed that when carrying out propagation-time
measurements, cable connections may represent impedance
discontinuities which can reflect a measuring pulse. This has the
effect of causing incorrect propagation-time measurements. As
cable connections cannot be eliminated, the results of propaga-
tion-time measurements should be subjected to critical evalua-
tion, (i.e. has a short cable value been obtained for a known
long cable?).
Where is it permitted to install FPs?
Inform the customer of the intended locations prior to installation
and obtain his approval.
Where is the PABX system going to be installed?
Attention: maximum length of cables to the FPs are: if UPDTS
interfaces are used: 1000m; if UPOTS interfaces are used:
2000m (for wires of 0.6 mm diameter).
What is the construction material of the walls?
This will help to estimate the possible radius of a radio cell or
how homogeneous an area is. Whatever the answer, a meas-
urement must still be carried out (refer to chapter on ”Ranges").
