DS3151 datasheet(5/60 Pages) DALLAS

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

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FEATURES (continued)

Receiver

§ AGC/equalizer block handles from 0 to 15dB of cable loss

§ Loss-of-lock (LOL) PLL status indication

§ Interfaces directly to a DSX monitor signal (~20dB flat loss) using built-in preamp

§ Digital and analog loss-of-signal (LOS) detectors (ANSI T1.231 and ITU G.775)

§ Optional B3ZS/HDB3 decoder

§ Line-code violation output pin and counter

§ Binary or bipolar framer interface

§ On-board 2

15 - 1 and 223 - 1 PRBS detector

§ Clock inversion for glueless interfacing

§ Tri-state clock and data outputs support protection switching applications

§ Per-channel power-down control

Transmitter

§ Binary or bipolar framer interface

§ Gapped clock capable up to 51.84MHz

§ Wide 50 ±20% transmit clock duty cycle

§ Clock inversion for glueless interfacing

§ Optional B3ZS/HDB3 encoder

§ On-board 2

15 - 1 and 223 - 1 PRBS generator

§ Complete DS3 AIS generator (ANSI T1.107)

§ Unframed all-ones generator (E3 AIS)

§ Line build-out (LBO) control

§ Tri-state line driver outputs support protection switching applications

§ Per-channel power-down control

§ Output driver monitor

1. DETAILED DESCRIPTION

The DS3151 (single), DS3152 (dual), DS3153 (triple), and DS3154 (quad) LIUs perform the functions necessary

for interfacing at the physical layer to DS3, E3, or STS-1 lines. Each LIU has independent receive and transmit

paths and a built-in jitter attenuator. The receiver performs clock and data recovery from a B3ZS- or HDB3-coded

alternate mark inversion (AMI) signal and monitors for loss of the incoming signal. The receiver optionally performs

B3ZS/HDB3 decoding and outputs the recovered data in either binary or bipolar format. The transmitter accepts

data in either binary or bipolar format, optionally performs B3ZS/HDB3 encoding, and drives standard pulse-shape

waveforms onto 75

W coaxial cable. The jitter attenuator can be mapped into the receiver data path, mapped into

the transmitter data path, or be disabled. The DS315x LIUs conform to the telecommunications standards listed in

Table 1-A. Figure 1-1 shows the external components required for proper operation.

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