Traditional Culture Encyclopedia - Traditional culture - Technical parameters of hotel special telephone
Technical parameters of hotel special telephone
◆ Power supply mode: line power supply ◆ Dialing mode: DTMF.
◆ Audio dialing (single frequency deviation is within 1.5%):
Low frequency group: 697,770,852,941Hz.
High frequency group: 1209, 1336, 1477Hz.
◆ Working temperature:-10℃ ~ 50℃
◆ Relative humidity: 45% ~ 95%
◆ Atmospheric pressure: 86 ~ 106 kPa
◆ Environmental crying noise: ≤60Db
◆ Working frequency: 300 ~ 3400 Hz
◆ Electro-acoustic characteristics: The frequency response curves of transmission and reception conform to GB/T 15279-2002.
◆ Port impedance: 600ω
◆ Ringing signal: > 60V
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