The Advanced Communications Riser, or ACR, is a form factor and technical specification for PC motherboard expansion slots. It is meant as a supplement to PCI slots, a replacement for AMR slots, and a competitor and alternative to CNR slots.

Technology

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The ACR specification provides a lower cost method to connect certain expansion cards to a computer, with an emphasis on audio and communications devices. Sound cards and modems are the most common devices to use the specification. ACR and other riser cards lower hardware costs by offloading much of the computing tasks of the peripheral to the CPU.

ACR uses a 120 pin PCI connector which is reversed and offset, retaining backward compatibility with 46 pin AMR cards while including support for newer technologies. It is also more cost-effective and simple for the manufacturer, as they buy more PCI slots and get a cheaper price on each, rather than buying a smaller quantity of different slots. These new features include standards for an EEPROM for storing model and vendor information, USB support, and the Integrated Packet Bus for DSL, cable modem, and wireless networking support.

History

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The ACR specification was created by the Advanced Communications Riser Special Interest Group (ACR SIG) in 2000 with the intent to replace the AMR specification. Because it was backwards compatible with AMR cards, and technically superior, it quickly replaced it.

See also

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• CNR, Intel's solution to the ACR problem
• AMR, the original Audio/Modem Riser that ACR replaced
• MDC, a version of ACR for mobile devices
• GeoPort, a similar standard for the Apple Macintosh

Computer buses | Motherboard

Advanced Communications Riser