DS3254 datasheet(29/71 Pages) DALLAS

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Table 9-A. DS3 Waveform Template

TIME (IN UNIT INTERVALS)

NORMALIZED AMPLITUDE EQUATION

UPPER CURVE

-0.85

£ T £ -0.68

0.03

-0.68

£ T £ +0.36

0.5 {1 + sin[(

p / 2)(1 + T / 0.34)]} + 0.03

0.36

£ T £ 1.4

0.08 + 0.407e

-1.84(T - 0.36)

LOWER CURVE

-0.85

£ T £ -0.36

-0.03

-0.36

£ T £ +0.36

0.5 {1 + sin[(

p / 2)(1 + T / 0.18)]} - 0.03

0.36

£ T £ 1.4

-0.03

Governing Specifications: ANSI T1.102 and Bellcore GR-499.

Table 9-B. DS3 Waveform Test Parameters and Limits

PARAMETER

SPECIFICATION

Rate

44.736Mbps (

±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

Between 0.36V and 0.85V

Pulse Shape

An isolated pulse (preceded by two zeros and

followed by one or more zeros) falls within the

curves listed in Table 9-A.

Unframed All-Ones Power Level at 22.368MHz

Between -1.8dBm and +5.7dBm

Unframed All-Ones Power Level at 44.736MHz

At least 20dB less than the power measured at

22.368MHz

Pulse Imbalance of Isolated Pulses

Ratio of positive and negative pulses must be

between 0.90 and 1.10.

Table 9-C. STS-1 Waveform Template

TIME (IN UNIT INTERVALS)

NORMALIZED AMPLITUDE EQUATIONS

UPPER CURVE

-0.85

£ T £ -0.68

0.03

-0.68

£ T £ +0.26

0.5 {1 + sin[(

p / 2)(1 + T / 0.34)]} + 0.03

0.26

£ T £ 1.4

0.1 + 0.61e

-2.4(T - 0.26)

LOWER CURVE

-0.85

£ T £ -0.36

-0.03

-0.36

£ T £ +0.36

0.5 {1 + sin[(

p / 2)(1 + T / 0.18)]} - 0.03

0.36

£ T £ 1.4

-0.03

Governing Specifications: Bellcore GR-253 and Bellcore GR-499 and ANSI T1.102.

Table 9-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 9-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.

DS3254 Datasheet(PDF) 29 Page - Dallas Semiconductor

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