DS3151 datasheet(27/60 Pages) DALLAS

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DS3151/DS3152/DS3153/DS3154 Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs

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Table 7-D. STS-1 Waveform Test Parameters and Limits

PARAMETER

SPECIFICATION

Rate

51.840Mbps (

±20ppm)

Line Code

B3ZS

Transmission Medium

Coaxial cable (AT&T 734A or equivalent)

Test Measurement Point

At the end of 0 to 450ft of coaxial cable

Test Termination

W (±1%) resistive

Pulse Amplitude

0.800V nominal (not covered in specs)

Pulse Shape

An isolated pulse (preceded by two zeros and followed by one

or more zeros) falls within the curved listed in Table 7-C.

Unframed All-Ones Power Level at 25.92MHz

Between -1.8dBm and +5.7dBm

Unframed All-Ones Power Level at 51.84MHz

At least 20dB less than the power measured at 25.92MHz.

Table 7-E. E3 Waveform Test Parameters and Limits

PARAMETER

SPECIFICATION

Rate

34.368Mbps (

±20ppm)

Line Code

HDB3

Transmission Medium

Coaxial cable (AT&T 734A or equivalent)

Test Measurement Point

At the transmitter

Test Termination

W (±1%) resistive

Pulse Amplitude

1.0V (nominal)

Pulse Shape

An isolated pulse (preceded by two zeros and followed by one

or more zeros) falls within the template shown in Figure 7-1.

Ratio of the Amplitudes of Positive and Negative

Pulses at the Center of the Pulse Interval

0.95 to 1.05

Ratio of the Widths of Positive and Negative

Pulses at the Nominal Half Amplitude

0.95 to 1.05

Figure 7-1. E3 Waveform Template

-0.1

-0.2

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

TIME (ns)

G.703

TEMPLATE

29.1

24.5

12.1

8.65

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