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Description varix 200/varix 14 (DECT)
2 Planning a cordless communications network
Where are large amounts of metal objects to be found?
- in walls
- as objects in storage
- in the form of machinery
Large localized concentrations of metal objects will rule out
computer-assisted planning. Every location will have to be
measured individually. Very narrow corridors may result in high
bit-error rates (tunnel effect). In such cases, it becomes impossi-
ble to establish a connection.
Walls with metal foils for screening (e.g. in rooms where X-rays
are used) not only prevent the passage of high-frequency radio
signals but also have an adverse effect on propagation condi-
tions in the immediate vicinity due to the high level of reflection
they cause. Factory areas with large amounts of sheet metal on
the walls, floors, and many sheet-metal cabinets have the same
effect. This will necessitate individual measurements being car-
ried out for each location.
Are there any devices on site or in the immediate vicinity which
might be the source of high frequency interference?
If strong interference of any kind is suspected, then DECT fre-
quencies should be checked with a spectrum analyzer (fre-
quency range: approx. 1.9 GHz). Non-DECT devices should
not really be able to affect the DECT frequency range. How-
ever, if interference is detected nonetheless, this may mean that
a DECT telephone network cannot be installed.
