CHAPTER 3.
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3-8
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The signaling specifications and signaling method of the T1 trunk line should comply with
the ITU G.703 and G.704 standards.
E1 Trunk Line
The electrical characteristics of the E1 trunk line comply with the ITU G.703 and the G.704
standards.
Table 3.10 Electrical Characteristics of the E1 Trunk Line
Category
Specification
Transmission speed
2048 Kbits/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
Indicated (pulse) nominal peak voltage
3.00 V
Blank (non-pulse) peak voltage
0 ±0.300 V
The signaling specification and signaling 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 3.11 Electrical Characteristics of the BRI Trunk Line
Category
Specification
Transmission speed
192 Kbits/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
A pair of twisted lines
Load resistance
120
Indicated (pulse) nominal peak voltage
2.75 V
