Product Manual - DM991 Series V Family - 204.4092.08 74
NRZ Data
2048kbit/s
Coding B B B
AMI B B
Coding B B V B
HDB3 B V B B
1 1
4 zeros sequence 4 zeros sequence
0 0 0 10 0 0 01 0 1 0
Figure 34. HDB3 coding in the G.703 2048kbit/s Interface
16.2.1. G.703 Interface Electrical Characteristics for Coaxial Cable
Speed: 2048kbit/s ± 50ppm
Pulse format: rectangular
Number of pairs in each transmission direction: 1 coaxial pair
Nominal impedance: 75ohms resistive
Pulse peak tensions: 2.37V ± 0.237V
Space peak tensions: 0V ± 0.237V
Pulse nominal duration: 244 nanoseconds
Rate between the positive and negative pulse amplitudes in the median point of a pulse width: from 0.95
to 1.05
Rate between the positive and negative pulse widths in nominal half amplitude: from 0.95 to 1.05
16.2.2. G.703 Interface Electricial Characteristics for Twisted Pair
Rate: 2048kbit/s +/- 50ppm
Pulse format: rectangular
Number of pairs for each transmission direction: 1 symmetric pair
Nominal impedance: 120ohms resistive
Pulse peak tension: 3 V +/- 0.3 V
Space peak tensions: 0 V +/- 0.3 V
Pulse nominal duration: 244 nanoseconds
Rate between the positive and negative pulse amplitudes in the median point of a pulse width: from 0.95
to 1.05
Rate between the positive and negative pulse widths in nominal half amplitude: from 0.95 to 1.05
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