Keysight / Agilent / HP J3420B HP-HSC ATM/155 Adapter

The Keysight/Agilent/HP J3420B is a High-Speed Channel (HSC) ATM adapter designed for 155 Mbps asynchronous transfer mode networking on HP 9000 Precision Architecture systems. This VME bus-compatible interface card integrates application-specific integrated circuits (ASICs) to deliver core I/O functionality, enabling high-speed ATM connectivity in HP 744 series board computers and compatible platforms. The adapter supports 155 Mbps MMF (Multi-Mode Fiber) ATM links and provides expandability for additional I/O or RAM within the VME architecture.

## Technical Specifications

• **Manufacturer:** Keysight / Agilent / HP
• **Model:** J3420B
• **Data Rate:** 155 Mbps ATM
• **Interface Type:** High-Speed Channel (HSC) ATM
• **Form Factor:** VME Bus compatible, single-slot configuration
• **Technology:** Application-Specific Integrated Circuits (ASICs) for core I/O functions
• **Network Connectivity:** Multi-Mode Fiber (MMF) ATM at 155 Mbps

## Key Features

• ASIC-based architecture for dedicated I/O processing
• VME bus integration with expandability options
• Support for 155 Mbps ATM transmission rates
• Designed around HP Precision Architecture workstation core I/O
• Multi-Mode Fiber optical connectivity for high-speed links

## Typical Applications

• ATM network interfaces in HP 9000 Precision Architecture systems
• High-speed data communications on HP 744 series board computers
• VME-based systems requiring dedicated 155 Mbps ATM connectivity
• Research and industrial computing environments using HP PA platforms

## Compatibility & Integration

The J3420B is primarily designed for HP systems, with documented compatibility for the HP 9000 Model 744 Precision Architecture board computers, including variants such as the 744/132L and 744rt/165L. The adapter operates within a VME environment and integrates core I/O functionality equivalent to HP-PA workstation specifications. Operating system support aligns with the HP 744 series platform capabilities.