DS3153N datasheet(26/60 Pages) DALLAS

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

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Transmitter Power-Down. To minimize power consumption when the transmitter is not being used, assert the

TPD configuration bit (CPU bus mode only). When the transmitter is powered down, the TXP and TXN pins are put

in a high-impedance state and the transmit amplifiers are powered down.

Transmitter Jitter Generation (Intrinsic). The transmitter meets the jitter generation requirements of all

applicable standards, with or without the jitter attenuator enabled.

Transmitter Jitter Transfer. Without the jitter attenuator enabled in the transmit side, the transmitter passes jitter

through unchanged. With the jitter attenuator enabled in the transmit side, the transmitter meets the jitter transfer

requirements of all applicable telecommunication standards in Table 1-A. See Figure 9-1.

Table 7-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 7-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 7-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 7-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.

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