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).