Gigaset N720 DECT IP Multicell System

Projecting the DECT networkMaterial characteristics and interference factorsThere are a number of interference factors that influence the range and quality of thetransmission in particular. The types of interference factors include:u Interference as a result of obstacles that diminish the signal transmission, creatingradio shadowsu Interference through reflection that restricts the call quality (e.g., crackling or backgroundnoise)u Interference through other radio signals that can lead to errors in transmissionInterference through obstaclesPossible 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 glassareas (reflections), firewalls, tank systems, refrigerators, electrical boilers etc.u Movable metal objects such as lifts, cranes, carts, escalators, shuttersu Room furnishings such as metal shelves, filing cabinetsu Electronic devices.It is often difficult to locate the exact source of the interference; particularly if the receptionpower of the local DECT signals fluctuates strongly within a few centimetres. In thesecases, the interference can be reduced or corrected by small changes to the position.Please noteWireless coverage in lifts is normally poor or not available at all (£ page 41).Loss of range through building materials in comparison to a free wirelessfield: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%16VoIPon www.voipon.co.uk sales@voipon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299