CHAPTER 3.
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3.2.1.3 Station Signaling
Dial Pulse Signaling
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.)
4TRM Module board is only support DTMF dialing, but not supports for Dial Pulse
dialing. 8TRK Cards is support DTMF and Dial Pulse dialing.
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 regular 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 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)
Length between PLIM and to SMT-R2000: Up to 100 m (When the Ethernet cable
is used)
Leakage resistance between lines: More than 20 KΩ
Leakage resistance between grounds: More than 20 KΩ