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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. The CX28333 gives the user new economies of scale in concentrator applications 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:
Distinguishing Features
• Can be used as a data transceiver over a maximum of 900 feet of Type 734/728 coaxial cable or equivalent in an on-premise environment Programmable pulse filtering to meet cross-connect pulse masks (ANSI T1.102-1993) Meets jitter specifications of Bellcore GR499, GR253, and TBR24 (with external JAT). Large input dynamic range Alarms for coding violation and loss of signal Full diagnostic loopback capability Uses a minimum of external components Compatible with ITU-T G.703, G.823 Independent power down mode per channel Easily interfaced to the DS3/E3 Framer IC (CX28342/3/4/6/8 and CN8330) Selectable B3ZS/HDB3 encoding/decoding Superior input receiver sensitivity (< 25 mV) Transmit monitor inputs (CX2833i-3x series only)
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In this document, "i" is used to represent the number of channels: i = 1 (CX28331), i = 2 (CX28332), and i = 3 (CX28333).
Functional Block Diagram
XOE LBO E3MODE PDB
• • •
TPOS TNEG TCLK TAIS
PDATA/ NDATA ENCODER TCLK
Pulse Shaper
LINE DRIVER
TLINEP TLINEM/N
Physical Characteristics
• • • • • • 80- and 100-pin ETQFP package Single 3.3 V power supply 1 W maximum power dissipation (CX28333) –40 °C to +85 °C temperature range 5 V-tolerant pins TTL digital pins
ENDECDIS
TX Monitor
TMONP TMONM TXMON TMONTST REFCLK
RLOOP LLOOP
DATA MUX
Applications
RPOS RNEG RCLK RLOS DECODER PDATA Clock/ NDATA Data DATCLK Recovery P N Receiver RLINEP RLINEM/N
ALOS
REQH LIU #1 LIU #2 LIU #3
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Digital Cross-Connect Systems Routers ATM Switches Channelized Line Aggregation Units Test Equipment Channel Service Units Multiplexers
NOTE(S): The TX Monitor is only used with the 100-pin CX2833i-3X.
Data Sheet
100985A June 2, 2000
CX28333EVM
TX B3ZS/HDB3 analog out NRZTX DATA and CLK in CH1 NRZRX DATA and CLK out F R A M E R S I.