DS3251/DS3252/DS3253/DS3254
Table 9-E. E3 Waveform Test Parameters and Limits
PARAMETER
SPECIFICATION
Rate
34.368Mbps (M20ppm)
Line Code
HDB3
Transmission Medium
Test Measurement Point
Test Termination
Coaxial cable (AT&T 734A or equivalent)
At the transmitter
75ꢀ (M1%) resistive
Pulse Amplitude
1.0V (nominal)
An isolated pulse (preceded by two zeros and
followed by one or more zeros) falls within the
template shown in Figure 9-1.
Pulse Shape
Ratio of the Amplitudes of Positive and Negative
Pulses at the Center of the Pulse Interval
Ratio of the Widths of Positive and Negative Pulses
at the Nominal Half Amplitude
0.95 to 1.05
0.95 to 1.05
Figure 9-1. E3 Waveform Template
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
17
8.65
G.703
E3
TEMPLATE
12.1
24.5
29.1
-0.1
-0.2
TIME (ns)
30 of 71
DALLAS [ DALLAS SEMICONDUCTOR ]
