CHAPTER 3. OfficeServ 7400 Specifications
3-6
© Samsung Business Communications
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The electrical characteristics of the ISDN (PRI) interface comply with the ITU I.431 and
ETS 300 011 standards
Table 3.8 Electrical Characteristics of the PRI Trunk Line
Categories
Specifications
Transmission speed
2048 kbit/s ±50 ppm
Code
High Density Bipolar of Order 3 (HDB3)
Pulse type
Regular square wave: When indicating all valid signals,
comply with the mask (I.403) regardless of the codes.
Nominal and pulse
244 ns
Transmission media
A pair of twisted lines
Load resistance
120
Ω
Indicated (pulse) nominal peak voltage 3.00 V
Blank (non-pulse) peak voltage
0 ±0.300 V
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The electrical characteristics of the Digital Line Interface (DLI) are shown in the table
below:
Table 3.9 Electrical Characteristics of the DLI Line
Categories
Specifications
Transmission speed
38144 kbit/s
Code
AMI (Alternate Mark Inversion)
Pulse type
Typical AMI Waveform
3.2.1.2. Signalling Type of the Dedicated Line
Electrical Characteristics of the GWIM Interface
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The electrical characteristics of the V.35 interface are shown in the table below:
Table 3.10 Electrical Characteristics of the GWIM Interface (V.35 Interface)
Categories
Specifications
Maximum transmission speed
10 Mbit/s
Transmission code
V.35 driver
Number of transmission lines
18 EA
Characteristic resistance
100
Ω
Indicated (pulse) nominal peak voltage
±2 V
Input Differential Threshold
±80 mV