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