PXB4220E-V32

Specialized Overview

The PXB4220E-V32 is an Interworking Element for 8 E1/T1 lines, part of the IWE8 family (Version 3.4). It functions as a hardware bridge between TDM-based networks and ATM infrastructure. The device supports both ATM mode and AAL mode, enabling unstructured and structured Circuit Emulation Service (CES) applications. Key interfaces include UTOPIA Level 1/2, Generic Framer Interface (FAM/GIM/SYM), IMA, and a microprocessor interface. It integrates an Internal Clock Recovery Circuit (ICRC) with PLL capabilities to handle jitter tolerance and transfer requirements for E1 and T1 signals.

Specialized Feature Summary

• Supports interworking between 8 E1/T1 lines and ATM networks via dedicated framer and UTOPIA interfaces.
• Integrates an Internal Clock Recovery Circuit (ICRC) with Phase-Locked Loop (PLL) for precise timing recovery and jitter management.
• Provides comprehensive support for ATM Mode and AAL Mode, including Unstructured and Structured CES functionalities.
• Includes extensive diagnostic features such as OAM processing, loopback modes, and detailed interrupt/status registers.

Specialized Applications

• Line card implementations in telecommunications switching systems.
• Echo canceller modules requiring precise timing synchronization.
• Network elements facilitating circuit emulation services over ATM infrastructure.

Specialized Procurement Notes

Verify the specific version suffix against the official Infineon datasheet DS3 (Jan. 2003) to ensure compatibility with required firmware or hardware revisions. Confirm that the V3.4 specification aligns with the target system's interface requirements, particularly regarding UTOPIA and ICRC configurations. Cross-reference pinouts and electrical characteristics with the latest available documentation before integration.

Specialized Selection Notes

Select this component when designing systems requiring the conversion of 8 E1/T1 channels into ATM cells or vice versa. Ensure the host processor can manage the complex register set and interrupt queues associated with the microprocessor interface. Evaluate the need for internal clock recovery versus external timing sources based on network jitter specifications.

Specialized Part Context

This component belongs to the IWE8 family, which also includes the PXB4219E and PXB4221E models. These devices serve as specialized interworking elements within Infineon's communications portfolio, designed to simplify the integration of legacy TDM services into modern ATM-based transport networks.

Specialized Replacement Considerations

Consult Infineon's application notes on product discontinuation for potential alternatives. Verify functional equivalence regarding the number of supported lines and interface protocols if substituting with other members of the IWE8 family or newer generations.

Specialized FAQ

What are the primary operational modes of the PXB4220E?

The PXB4220E operates in two primary modes: ATM Mode, where it handles raw ATM cell transmission and reception, and AAL Mode, which supports Circuit Emulation Service (CES) for both unstructured and structured data streams.

How does the PXB4220E handle clock recovery?

It utilizes an Internal Clock Recovery Circuit (ICRC) equipped with a Phase-Locked Loop (PLL). This allows the device to recover timing from incoming E1/T1 signals and manage jitter tolerance and transfer according to standard specifications.

Which interfaces are used for connecting to the host system?

The device connects to the host via a Microprocessor Interface (supporting Intel and Motorola modes) and provides data connectivity through UTOPIA Level 1/2 and IMA interfaces for high-speed cell transfer.