Analog telephone KNZD-28

VoIPSIPPoE

Desktop telephone KNZD-28 The industrial desktop telephone will be designed to work on railway, metro, tunnel, etc. Housed in robust aluminium box with one CALL/ ANSWER button, it will offer protection against the outdoor environment and vandals.The unit will meet all the latest European/UK standards telephony, waterproofing IP65, and lightening protection together with offering the level of performance and reliability demanded in such an environment. Characteristics: +Robust Metal body very strong. +With keypad. +LED indicator to inform you there is a coming call +Robust and weather resistant, Wearable and moisture proof IP65 +Dual purpose design for wall or desk mounting, simple installation +Industry standard robust handset with stainless armoured cord +Well treated metal hook switch. TECHNICAL SPECIFICATION 1.It is suitable for automatic instrution amplification telephone system when feed voltage reaches to 33-60v. 2.Environmental temperature:-40℃-75℃. 3.Relative humidity:10%-95%. 4.Atmospheric pressure:86-106kpa. 5.Environmental noise:<=80db 6.Double audio dialing. 7.Standard frequency:697,770,852,941Hz. 8.Low frequency group:697,770,852,941Hz. 9.High frequency group:1209,1336,1477Hz. 10.Frquency offset:≤±1.5%. 11.The signal level when the lenght of user's line is 3 km. 12.Standard frequency:Low frequency group:-9db. 13.Hight frenquency group:-7db±3db. 14.Level difference frequency high and low frequency of combined signal:2±1db. 15.The total intermodulation distortion caused by harmonic is 20db lower than wave level. 16.Call transmission index:(5KM)SLR≤12,RLR≤-1,and STML≥10,Input impedance:600Ω.