XRT7300IV

Overview

The XRT7300IV is a DS3/E3/STS-1 Line Interface Unit (LIU) manufactured by MaxLinear, Inc. It integrates a line transmitter and receiver on a single chip to support E3 (34.368 Mbps), DS3 (44.736 Mbps), or SONET STS-1 (51.84 Mbps) data rates. The device encodes input data into B3ZS format for DS3/STS-1 applications or HDB3 format for E3 applications. It features a 4-Wire Microprocessor Serial Interface for accessing on-chip Command registers. The component operates within a temperature range of -40°C to +85°C and utilizes a single +5V power supply.

Feature Summary

• Supports configurable E3, DS3, and SONET STS-1 transmission rates with corresponding B3ZS or HDB3 encoding.
• Includes full loop-back capability for analog local, digital local, and remote testing modes.
• Integrates transmit and receive power down modes to manage operational states.
• Features a 4-Wire Microprocessor Serial Interface for comprehensive register access and configuration.

Applications

• Interfaces to E3, DS3, or SONET STS-1 Networks
• CSU/DSU Equipment
• PCM Test Equipment
• Fiber Optic Terminals
• Multiplexers

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and operating temperature range. Confirm that the component meets RoHS compliance requirements prior to integration. Ensure that the design accounts for the single +5V power supply requirement and the specified thermal operating limits.

Selection Notes

Select the XRT7300IV when designing systems requiring a single-chip solution for DS3, E3, or STS-1 line interfacing. Consider the integrated encoder and decoder capabilities which minimize external component count. Evaluate the need for microprocessor control versus hardware pin selection based on system architecture requirements.

Part Context

The XRT7300 series consists of Line Interface Units designed for high-speed serial telecommunications applications. This specific model provides the physical layer interface functions necessary to connect terminal equipment to coaxial cable networks. It serves as a critical component in network infrastructure for signal conditioning and protocol conversion.

Replacement Considerations

Consult official manufacturer documentation for confirmed substitute part numbers. Verify compatibility regarding pinout, voltage levels, and functional specifications before implementing any alternative components.

FAQ

What encoding formats does the XRT7300 support?

The XRT7300 supports B3ZS encoding for DS3 and SONET STS-1 applications, and HDB3 encoding for E3 applications.

How is the data rate selected on the XRT7300?

Data rates can be selected via hardware input pins (E3 and STS-1/DS3) in Hardware Mode, or through bit-fields within Command Register CR4 in HOST Mode.

What are the available loop-back modes?

The device supports Analog Local Loop-Back, Digital Local Loop-Back, and Remote Loop-Back modes, selectable via dedicated input pins or command registers.