OfficeServ 7400 General Description
© Samsung Business Communications
3-5
y
The signalling specifications and the signalling method of the T1 trunk line should com-
ply with the ITU G.703 and G.704 standards.
E1 Trunk Line
y
The electrical characteristics of the E1 trunk line comply with the ITU G.703 and the
G.704 standards.
Table 3.6 Electrical Characteristics of the E1 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 (G.703) regardless of the codes.
Nominal and pulse
244 ns
Jitter of the I/O terminal
Refer to the G.823
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
y
The signalling specifications and the signalling method of the E1 trunk line comply with
the ITU G.703 and G.704 standards.
Characteristics of the ISDN Interface Transmission
The electrical characteristics of the ISDN (BRI) interface comply with the ITU I.430 and
ETS 300 012 standards.
Table 3.7 Electrical Characteristics of the BRI Trunk Line
Categories
Specifications
Transmission speed
192 kbit/s ±100 ppm
Code AMI
Pulse type
Regular square wave: When indicating all valid signals,
comply with the mask (I.403) regardless of the codes.
Transmission media
Pair of twisted lines
Load resistance
120
Ω
Indicated (pulse) nominal peak voltage
2.75 V