Operation Manual

Projecting the DECT network

Gigaset N720 DECT IP Multicell System / engbt / A31008-M2316-L101-2-7619 / preparation.fm / 10.02.2012

Version 2, 06.08.2010

Material characteristics and interference factors

There are a number of interference factors that influence the range and quality of the

transmission in particular. The types of interference factors include:

u Interference as a result of obstacles that diminish the signal transmission, creating

radio shadows

u Interference through reflection that restricts the call quality (e.g., crackling or back-

ground noise)

u Interference through other radio signals that can lead to errors in transmission

Interference through obstacles

Possible obstacles are:

u Building constructions and installations such as reinforced concrete ceilings and walls,

stairwells, long corridors with fire doors, uptakes and cable channels.

u Metal-clad rooms and objects such as cold stores, computer rooms, metallised glass

areas (reflections), firewalls, tank systems, refrigerators, electrical boilers etc.

u Movable metal objects such as lifts, cranes, carts, escalators, shutters

u Room furnishings such as metal shelves, filing cabinets

u Electronic devices.

It is often difficult to locate the exact source of the interference; particularly if the recep-

tion power of the local DECT signals fluctuates strongly within a few centimetres. In these

cases, the interference can be reduced or corrected by small changes to the position.

Loss of range through building materials in comparison to a free wireless

field:

Please note

Wireless coverage in lifts is normally poor or not available at all (£ page 41).

Glass, wood, untreated Approx. 10%

Wood, treated Approx. 25%

Plasterboard Approx. 27 – 41%

Brick wall, 10 to 12 cm Approx. 44%

Brick wall, 24 cm Approx. 60%

Aerated concrete wall Approx. 78%

Wired glass wall Approx. 84%

Reinforced concrete ceiling Approx. 75 – 87%

Metal-coated glass Approx. 100%