Gigaset N720 DECT IP Multicell System

Taking measurementsReception powerThe reception field strength is measured to assess the quality of transmission. The receptionpower (proportional to the field strength) is displayed on the measuring handset in dBm(£ page 48). A very good reception power is approximately –50 dBm. Systems that aremeasured at up to –60 dBm generally offer a good quality. For measurements up to –70 dBm,the measurement must be checked and evaluated with an audio connection to ensure sufficientquality. A handover is no longer possible in this area.Different limit values can be used for the measurement, based on the quality or use ofspecific areas (e.g., office, corridor, basement). Different quality requirements can also bedefined at the various base stations within a partial system.Typical limit values for normal, low-interference environments are:§§1§§ Limit value for secured voice quality: –65 dBmThis is the value at which a handset must receive the signal of a base station for a subscriberto be able to benefit from good quality telephony. For an interference-freehandover, the handset must receive both base stations at this level of quality.§§2§§ Limit value for synchronisation: –70 dBmThis is the value at which a base station must receive the signal of another base stationto be able to synchronise.The following table gives an initial guideline for the quality of the wireless connection.Reception power–50 dBm Very good–60 dBm Good–65 dBm Satisfactory–70 dBm AdequateEvaluation of the quality–73 dBm Weak, not suitable–76 dBm Poor, not suitable22VoIPon www.voipon.co.uk sales@voipon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299