CX28331 datasheet(33/68 Pages) CONEXANT

33 / 68 page

100985A

Conexant

2-1

2.0 Functional Description

2.1 Overview

CX28333 is a triple E3/DS3/STS-1 Line Interface Unit (LIU). It is the physical

layer interface between the data framer (or other terminal-side equipment) and the

electrical cable used for data transmission.

The CX28333 LIU consists of three independent data transceivers that can

operate over type 734/728 coaxial cable at the rates of 34.368 Mbps (E3), 44.736

Mbps (DS3), and 51.84 Mbps (STS-1). The transmit side takes an NRZ or

already-encoded dual rail input and encodes it into AMI B3ZS (for DS3/STS-1)

or HDB3 (for E3) analog waveforms to be transmitted over the coaxial cable. The

receiver side takes in the attenuated and distorted analog receive signal and

equalizes, slices, and resynchronizes the signal before decoding it to the NRZ

output or sending out a non-decoded dual rail.

CX28331 and CX28332 are single- and dual-E3/DS3/STS-1 LIUs,

respectively. In all respects, their performance and features are identical to the

CX28333.

The architecture of the CX2833i includes the following internal functions for

each channel:

Transmitter:

•

AMI B3ZS/HDB3 encoder

•

pulse shaper

•

line driver

•

Alarm Indication Signal (AIS) insertion

•

transmit monitor

Receiver:

•

receive sensitivity

•

Automatic Gain Control (AGC)

•

receive equalizer

•

Clock Recovery circuit

•

Loss Of Signal (LOS) detector

•

B3ZS/HDB3 decoder with bipolar violation detector

•

data squelching

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