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