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CompactPCI（cPCI）成立于20世纪90年代后期，旨在围绕PCI提供坚固耐用、基于Eurocard的外形。该规范基于 2 mm 连接器标准和 IEEE 1101.10/11 机械装置。PCIbus 是一款久经考验的总线，在电信、工业自动化等不同细分市场拥有庞大的安装基础。CompactPCI 架构还可以利用低成本、广泛可用的PCI芯片和无处不在的wIntel（Windows/英特尔）架构。
PICMG 在九十年代末发布了一系列规范，这些规范满足了电信行业的关键要求，例如热交换和五九的可用性 (99.999)。PICMG 2.1（Hotswap）、PICMG 2.5（H110 电话总线）、PICMG 2.7（双系统插槽）和 PICMG 2.9（系统管理总线）是使使用cPCi总线成为开发满足计算机电话、VoIP和众多其他应用的新产品的有说服力的理由的一些规格。
FAQs
CompactPCI (cPCI) is a modular embedded computing architecture based on the PCI electrical standard — adapted into a rugged Eurocard-based form factor for industrial and military applications. It leverages PCI’s proven bus technology in a durable mechanical format suitable for harsh environments.
The CompactPCI specification features a rugged Eurocard form factor, compliance with IEEE 1101.10/11 mechanical standards, and support for hot-swap interoperability and system-level management. It builds on PCI bus technology with modular backplane designs and slot-based architecture.
There are no functional differences — “CompactPCI” and “CPCI” refer to the same modular embedded bus standard. CPCI is just a commonly used shorthand for CompactPCI and reflects the same PICMG 2.0-based architecture with rugged Eurocard packaging.
While CompactPCI uses a parallel PCI bus, modern extensions such as CompactPCI PlusIO and CompactPCI Serial build on the same mechanical form factor to add serial, high-speed protocol support (like PCIe, SATA, USB, Ethernet) while maintaining compatibility with the original cPCI architecture.
CompactPCI remains relevant because it provides a proven modular standard with extensive industry support and interoperability, strong hot-swap capability, and compatibility with a wide range of boards and backplanes — ideal for applications where long-term reliability and maintainability matter