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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.

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)

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

Applications

? Digital Cross-Connect Systems

? Routers

? ATM Switches

? Channelized Line Aggregation Units

? Test Equipment

? Channel Service Units

? Multiplexers