Infineon Technologies PEF 2256 H V2.2

Overview

PEF 2256 H V2.2 from Infineon Technologies is an E1/T1/J1 framer and Line Interface Unit (LIU) transceiver IC in P-MQFP-80 package, supporting full pulse template compliance, jitter tolerance per ITU-T G.703, and SSM (Synchronization Status Message) for telecom timing networks. It integrates line driver/receiver circuitry with programmable PCM interface and operates across short/long-haul E1 (75 Ω/120 Ω), T1 (100 Ω), and J1 configurations.

For engineers reviewing the PEF 2256 H V2.2 datasheet, PEF 2256 H V2.2 pinout, PEF 2256 H V2.2 application, or PEF 2256 H V2.2 equivalent, this page delivers verified technical context, real-world clocking architecture, line interface compliance details, SSM implementation notes, and evaluation-ready hardware integration guidance.

Technical Context

The PEF 2256 H V2.2 implements a dual-mode framer/LIU architecture with integrated analog front-end (AFE) supporting E1, T1, and J1 physical layer standards without external resistor reconfiguration. It embeds ITU-T K.20/K.21-compliant surge protection and meets receiver return loss ≥12 dB and transmitter output jitter <0.75 UI p-p (E1 mode).

Timing is derived from a single crystal oscillator feeding a flexible clock generation system that supports master/slave modes, frame synchronization via DPLL, and SSM byte insertion/extraction per ITU-T G.781. The device interfaces to a 16-bit C165UTAH controller via parallel bus and supports RS-232/USB host communication for configuration and alarm monitoring.

Key Specifications

Availability

PEF 2256 H V2.2 is available at Aetrix Electronics and suitable for E1/T1 network termination equipment, telecom access multiplexers, and carrier-grade line card designs requiring stable component supply, long-lifecycle support, and AT&T/ETSI certification readiness.

Supply support for PEF 2256 H V2.2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive, and communications ICs, with global R&D and manufacturing infrastructure.

The FALC®56 product line - including PEF 2256 H V2.2 - was designed specifically for carrier-class E1/T1/J1 framer + LIU integration in access networks, central office line cards, and multi-service provisioning platforms.

FAQ

What is the primary function of the PEF 2256 H V2.2 in telecom systems?

The PEF 2256 H V2.2 serves as a fully integrated E1/T1/J1 framer and Line Interface Unit (LIU), performing physical layer framing, line driving/receiving, clock recovery, SSM processing, and alarm generation. It replaces discrete framer + LIU + timing IC combinations in access network line cards and supports direct connection to RJ-45/BNC test ports.

Does the PEF 2256 H V2.2 require external clock sources or can it operate standalone?

The PEF 2256 H V2.2 requires a single external crystal oscillator (typically 4.096 MHz or 8.192 MHz) to generate internal clocks; it does not include an on-chip oscillator. Its DPLL recovers frame timing from incoming signals and maintains holdover during loss-of-signal events, but initial reference clocking must be provided externally.

How is Synchronization Status Message (SSM) implemented in this device?

The PEF 2256 H V2.2 inserts SSM bytes into outgoing E1/T1 frames and extracts/interprets SSM from incoming frames per ITU-T G.781. It supports SSM level mapping (e.g., PRS, SSU-A, SEC), automatic SSM propagation, and alarm triggering on SSM degradation - all configurable via its API and register interface.

Is the PEF 2256 H V2.2 pin-compatible with earlier PEF 2256 revisions?

Yes - PEF 2256 H V2.2 maintains identical pinout, package (P-MQFP-80), and electrical characteristics with prior PEF 2256 H versions. Firmware and hardware designs qualified for V2.1 or V2.0 are directly compatible; only minor errata fixes and qualification updates distinguish V2.2.