CHAPTER 3.
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3.2.2 Transmission Characteristics
Attenuation
Attenuation between subscribers: Less than 6 dB
Attenuation between the subscriber and local trunk line: Less than 0.5 dB
Characteristic resistance of the line: 600 Ω
Weighted noise: Less than -65 dBm
Crosstalk attenuation: Less than -68 dBm
Frequency band: 300~3400 Hz
Insulation resistance: More than 1 MΩ
3.2.3 Line Conditions
Length for installation:
Regular phones: Up to 1 km (When the AWG #24 cable is used)
Digital phones: Up to 400 m (When the AWG #24 cable is used)
Door phones: Up to 400 m (When the AWG #24 cable is used)
AOMs: Up to 400 m (When the AWG #24 cable is used)
Leakage resistance between lines: More than 20 KΩ
Leakage resistance between grounds: More than 20 KΩ