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CompactPCI（cPCi）成立於 1990 年代後期，為 PCI 提供堅固的基於歐洲卡的外型規格。該規格基於 2 毫米連接器標準和 IEEE 1101.10/11 機械設備。PCIBus 是一個經過驗證的匯流排，在不同市場部門（例如電信、工業自動化等）擁有龐大的安裝基礎。CompactPCI 架構還可以利用更低的成本、廣泛可用的 PCI 矽和無處不在的 WinTel（Windows/Intel）架構。
PICMG 在九十年代末發布了一系列規格，解決了電信行業的關鍵要求，例如熱交換和五九條可用性（99.999）。PICMG 2.1（熱交換）、PICMG 2.5（H110 電話匯流排）、PICMG 2.7（雙系統插槽）和 PICMG 2.9（系統管理總線）是使用 cPCI 匯流排成為適用於計算機電話、VoIP 和眾多其他應用的新產品的重要原因。
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