Infineon PEF22624EV2: A Comprehensive Technical Overview and Application Note

The Infineon PEF22624EV2 is a highly integrated, single-chip Line Interface Unit (LIU) and framer designed for E2/T2 digital transmission systems. As a cornerstone component in telecommunications infrastructure, particularly in access networks and leased line applications, this device combines advanced functionality with robust performance. This article provides a detailed technical examination of the PEF22624EV2, its architecture, key features, and typical application scenarios.

Architectural Overview and Core Functionality

At its heart, the PEF22624EV2 is a system-on-chip (SoC) that seamlessly integrates two primary functions: a full-duplex LIU and a high-level data link control (HDLC) framer/deframer. The LIU handles the physical layer interface, providing all necessary functions for a fully compliant G.703/G.704 E2 (8.448 Mbit/s) or T2 (6.312 Mbit/s) interface. This includes line termination, waveform shaping, clock extraction, and jitter attenuation. The integrated framer processes the data stream, handling payload mapping, frame alignment, and error detection.

Key Technical Features and Innovations

The device's feature set is engineered for reliability and ease of design:

Dual Supply Operation: It operates with a single +5V supply for the analog line interface and a +3.3V supply for the digital core, simplifying power management design and reducing overall system power consumption.

Integrated Jitter Attenuator: A crucial feature for maintaining signal integrity, the on-chip jitter attenuator can be configured to be either in the transmit or receive path, providing flexibility to combat timing jitter accumulated across the network.

Hardware and Software Control: The PEF22624EV2 offers two control modes: a hardware mode using pin strapping for basic configuration and a comprehensive software mode via a microprocessor interface for advanced control and monitoring. This dual approach facilitates both simple and complex system designs.

Comprehensive Diagnostics: The chip includes extensive built-in test capabilities (BIT), such as loopback modes (local, remote, and analog) and error injection/detection, which are indispensable for system debugging, field testing, and maintenance.

Low Power Consumption: Despite its high level of integration, the device is optimized for low power, making it suitable for power-sensitive applications.

Primary Applications and Implementation

The PEF22624EV2 is predominantly used in telecommunications equipment:

E2/T2 Lease Line Terminations: Serving as the central component in channelized lease line equipment for business services.

Digital Cross-Connects (DCS): Facilitating the routing and management of E2/T2 level signals within network nodes.

Add-Drop Multiplexers (ADM): Used in SDH/SONET or PDH networks to add or drop lower-rate signals like E2/T2 from a higher-rate aggregate stream.

Network Interface Cards: For routers and other data communication equipment requiring a direct, reliable E2/T2 connection.

When implementing the PEF22624EV2, careful attention must be paid to the board layout, particularly the separation of analog and digital grounds to minimize noise. The external component count is low, typically requiring only a crystal oscillator, transformers, and passive components to complete a fully functional interface design.

ICGOOODFIND

The Infineon PEF22624EV2 stands out as a highly reliable and integrated solution for E2/T2 interfacing, effectively reducing design complexity, board space, and time-to-market for telecommunications infrastructure products. Its blend of hardware and software control, coupled with robust diagnostic features, makes it a versatile and powerful choice for modern digital transmission systems.

Keywords:

Line Interface Unit (LIU)

Jitter Attenuator

E2/T2 Interface

HDLC Framer

Telecommunications Infrastructure