CX28331-1X CONEXANT [Conexant Systems, Inc], CX28331-1X Datasheet

CX28331-1X

Manufacturer Part Number

CX28331-1X

Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

Manufacturer

CONEXANT [Conexant Systems, Inc]

Datasheet

1.CX28331-1X.pdf (68 pages)

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Advance Information

This document contains information on a product under development. The parametric information

contains target parameters that are subject to change.

CX28331/CX28332/CX28333

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

The CX28333 is a three-channel, E3/DS3/STS-1 fully-integrated Line Interface Unit

(LIU). It is configured via external pins and does not need a microprocessor interface.

Each channel has an independent equalizer on the receive side requiring no user

configuration. Also, each channel has a programmable transmit pulse shaper that can

be set to ensure that the cross-connect pulse mask requirement is met for transmit

cable length up to 450 feet. The CX28332 is a dual-channel, and the CX28331 is a

single-channel LIU with performance identical to the CX28333.

where three DS3 or STS-1 channels are concentrated into a single STS-3 channel. By

including three independent transceivers on a chip, significant external components are

eliminated, with the exception of 1:1 coupling transformers, termination resistors, and

supply bypass capacitors.

NOTE:

Functional Block Diagram

Data Sheet

NOTE(S): The TX Monitor is only used with the 100-pin CX2833i-3X.

E3MODE

RLOOP

LLOOP

The CX28333 gives the user new economies of scale in concentrator applications

RNEG

RPOS

TPOS

TNEG

RLOS

RCLK

TCLK

TAIS

XOE

PDB

LBO

In this document, "i" is used to represent the number of channels:

i = 1 (CX28331), i = 2 (CX28332), and i = 3 (CX28333).

DATA

MUX

DECODER

ENCODER

PDATA/

NDATA

TCLK

DATCLK

PDATA

NDATA

Shaper

Recovery

Pulse

Clock/

Data

ALOS

DRIVER

LINE

Receiver

Monitor

TLINEP

TLINEM/N

TMONP

TMONM

TXMON

TMONTST

REFCLK

RLINEP

RLINEM/N

REQH

LIU #1

LIU #2

LIU #3

Distinguishing Features

• Can be used as a data transceiver

• Programmable pulse filtering to meet

• Meets jitter specifications of Bellcore

• Large input dynamic range

• Alarms for coding violation and loss

• Full diagnostic loopback capability

• Uses a minimum of external

• Compatible with ITU-T G.703, G.823

• Independent power down mode per

• Easily interfaced to the DS3/E3

• Selectable B3ZS/HDB3

• Superior input receiver sensitivity

• Transmit monitor inputs (CX2833i-3x

Physical Characteristics

• 80- and 100-pin ETQFP package

• Single 3.3 V power supply

• 1 W maximum power dissipation

• –40 °C to +85 °C temperature range

• 5 V-tolerant pins

• TTL digital pins

Applications

• Digital Cross-Connect Systems

• Routers

• ATM Switches

• Channelized Line Aggregation Units

• Test Equipment

• Channel Service Units

• Multiplexers

over a maximum of 900 feet of Type

734/728 coaxial cable or equivalent

in an on-premise environment

cross-connect pulse masks (ANSI

T1.102-1993)

GR499, GR253, and TBR24 (with

external JAT).

of signal

components

channel

Framer IC (CX28342/3/4/6/8 and

CN8330)

encoding/decoding

(< 25 mV)

series only)

(CX28333)

June 2, 2000

100985A

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