VoIP telephone KNZD-09A-1T2S

GSMGPRSPoE

Highway emergency telephone use in the highway, specially dealing with remote road location, not be able to use wireless communication equipment and set up an emergency call.The emergency telephone has a stable communications, weather, the characteristics of violence prevention. 1.2 main performance characteristics Housing: metal panel, strong anti-riot Handle: special ABS engineering plastic, integral structure, waterproof, dustproof, anti-crack, anti-knock, tensile All the accessories of the handset, receiver, buzzer, circuit board and housing are multi-layer waterproof and dustproof. The phone has good stability and strong anti-interference ability, and meets the national standard GB/T 15279-94,European/UK standards for EMS and US FCC. Protection class IP65 1.3 technical parameters Ringing level: 85dB (A) Pulse dialing: The discontinuous ratio of the dial pulse is: 1.6±0.2..1.0 Dial pulse speed: 10±1 times/second Dual Tone Multi-Frequency (DTMF) dialing: Frequency offset: ≤1.5%; Low frequency group level: -9±3dB; High frequency group level: -7±3dB High and low level difference in frequency combination: ±1dB; Total distortion such as harmonics is at least 20dB lower than the fundamental level Call transmission index: SLR ≤ 12, RLR ≤ -1, STMR ≥ 10, output impedance: 600 Ω Electroacoustic characteristics: Transmit loudness rating ≥+2dB ≤+12dB Accept the loudness rating ≥-8dB ≤-1dB Sidetone masking evaluation value ≥+3dB ≥+10dB 2 Installation method Reserve a suitable space for the wall to be installed. The wall-mounted wall can be fixed with stainless steel mechanical screws. 3 operation use Call function. Off-hook automatic dialing (number can be set by yourself).