隧道电话KNSP-04

模拟 网络电话 坡

1.2.铝合金压铸体，防Vandal，防篡改2 .呼叫/应答按钮。免提4。电话线路供电。5.ITU-T K.21的雷电保护降噪麦克风8.听觉辅助设备可选7分钟时间可选9。 Unit size: 320×205×120mm 1. Product features Automatically dial Call time limited Send address code of this machine, and code sending time can be adjustable High waterproof, dustproof performance, full aluminum phone cover, IP66 protection grade.Sprayed with imported reflective lacquer on the surface, bright color, 5-10 years not fading, completely conform to the standards of GB/T5237.2-2000. 2. Scope of application It is applied to highway for emergency call, railway or subway for interval telephone call, and tunnels, electric tunnels for maintenance call. 3. Technical Parameters Ambient temperature:-30 ~ +60 degree, Relative humidity:10%~95% Atmospheric pressure: 86~106Kpa Circumstance noise:less than 60dB(A) Sound level of ringing:over 70dB(A). Standard frequency:low frequency group:697. 770. 852. 941Hz, high frequency group:1209. 1336. 1477Hz, frequency deviation:-1.5% ~ +1.5% If service line is a 3Km signal - level: Standard frequency:low frequency group:-12dB~-6dB, high frequency group:-10dB~-4dB, level difference between low and high frequency of compound signal:0dB~3dB, the total distortion caused by intermodulation of harmonic wave is lower than the basic level by at least 20dB. An outer metal casting, sealing, waterproof rating to IP66. Using this telephone, to meet the communication requirements for outdoor, and not easily damaged, long life, good stability.