78P2352-IEL/F

Overview

The 78P2352-IEL/F is a dual-channel Line Interface Unit (LIU) designed for 155 Mbps SDH/SONET (OC-3, STS-3, STM-1) and 140 Mbps PDH (E4) telecom interfaces. It integrates an adaptive CMI equalizer and clock recovery in the receive path to handle cable loss exceeding 12.7dB. The device supports both 75Ω coaxial transmission using CMI coding and optical fiber links via NRZ coding. It operates from a single 3.3V supply and features selectable LVPECL or parallel CMOS system interfaces with integrated FIFOs for clock decoupling.

Feature Summary

• Dual-channel architecture supporting OC-3/STM-1-E and E4 rates
• Integrated adaptive equalizer and clock recovery for robust signal reception
• Flexible interface options including serial LVPECL and 4-bit parallel CMOS
• Compliance with ITU-T G.703, ANSI T1.105, and Telcordia GR-253 standards

Applications

• Central Office Interconnects
• DSLAMs
• Add Drop Multiplexers (ADMs)
• Multi Service Switches
• Digital Microwave Radios

Procurement Notes

Verify the specific suffix 'IEL' against official documentation to confirm package type and temperature range. Confirm RoHS compliance status as legacy Teridian products may vary. Ensure the source document matches the exact part number to avoid discrepancies in pinout or electrical characteristics.

Selection Notes

Select this component when a dual-channel LIU solution is required for mixed E4 and STM-1 environments. Consider the integrated CDR and equalizer for applications involving significant cable loss. Evaluate the available interface modes (serial vs. parallel) against the host framer's capabilities.

Part Context

The 78P2352 belongs to the second-generation Teridian LIU family, succeeding earlier single-channel solutions. It consolidates dual-channel functionality into a single chip, reducing board space compared to using two separate 78P2351 units. This integration simplifies design for multi-rate telecom equipment requiring both E4 and STM-1 support.

Replacement Considerations

The 78P2351 is a single-channel variant of the same family. Verify if a single channel suffices for the application. Check for newer generations of LIUs from Analog Devices that may offer improved performance or updated packaging.