78P2352-IELR/F

Overview

The 78P2352 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 high-loss coaxial reception
• Flexible interface options including serial LVPECL and 4-bit parallel CMOS
• Compliance with ANSI T1.105.03-1994 and ITU-T jitter standards

Applications

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

Procurement Notes

Verify the specific suffix 'IELR/F' against the manufacturer's official ordering guide to confirm package type and tape-and-reel specifications. Confirm RoHS compliance status as datasheets may vary by revision. Ensure the component meets current environmental regulations for your target market before finalizing procurement.

Selection Notes

Select this component when a dual-channel LIU solution is required for mixed E4 and STM-1 applications. Evaluate the need for integrated CDR and adaptive equalization if connecting directly to long coaxial runs. Consider the available interface modes (LVPECL vs. Parallel) based on the host framer or ASIC capabilities.

Part Context

This part belongs to the 78P235x family of Line Interface Units. It serves as the dual-channel counterpart to the single-channel 78P2351. Both devices share similar functional blocks but differ in channel count and pinout configurations suitable for different board space requirements.

Replacement Considerations

The 78P2351 is a single-channel variant within the same family. Verify pin compatibility and register mapping differences before substitution. No other direct cross-model replacements are documented in the provided source material.