OfficeServ 7200 System Description
© SAMSUNG Electronics Co., Ltd.
3-13
3.2.1.4 Signaling Type of the Station
Dial Pulse Signaling Type
Ratio-10 Pulse Per Second (PPS)
Make/Break Ratio (M/B ratio)-33%: 66% (It can be adjusted by the software.)
The minimum signaling time between digits-20 ms (It can be adjusted by the software.)
DTMF Push Button Dialing
The DTMF signal processing complies with the ITU standard, which enables the user to
send/receive the signals of digital phones through the trunk line and to process the signals
of analog phones.
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
Weighted noise: Less than-65 dBm
Crosstalk attenuation: Less than-68 dBm
Frequency band: 300~3400 Hz
Insulation resistance: More than 1 M
3.2.3 Line Conditions
Length for installation:
Analog 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 k
Leakage resistance between grounds: More than 20 k
