Electrical Specification; Signal Specification; Figure 3.1 Trunk Line Loop Start Signaling; Table 3.6 Electrical Characteristics Of The Pri Trunk Line - Samsung OfficeServ 7070 System Description

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3.2 Electrical Specification

3.2.1 Signal Specification

The signal processing protocol means the methods for connecting signals between the trunk
lines, stations and system, and also means the method of providing the status information.
3.2.1.1 Trunk Line Signaling
Loop Start
In processing loop start signals, the on-hook and the off-hook statuses are controlled by the
flow of electric current. The loop is a closed loop trunk circuit or a standard 2500-type set
loop.
Characteristics of the ISDN Interface Transmission
The electrical characteristics of the ISDN (PRI) interface comply with the ITU I.430 and
ETS 300 012 standards.
Transmission speed
Code
Pulse type
Nominal and pulse
Transmission media
Load resistance
Indicated (pulse) nominal peak voltage
Blank (No Pulse) Peak Voltage
3-4
OPEN END
GND
T
R
-48 VDC
(C.O.)

Figure 3.1 Trunk Line Loop Start Signaling

Table 3.6 Electrical Characteristics of the PRI Trunk Line

Category
T
R
Specification
2048 Kbits/s ±50 ppm
HDB3 (High Density Bipolar of Order 3)
Regular square wave: When indicating all valid signals,
comply with the mask (I.403) regardless of the codes.
244 ns
A pair of twisted lines
120 Ω
3.00 V
0 ±0.300 V
CLOSED END
X
Key Telephone
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