ACR 1.0 Specification

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Advanced Communication Riser 1.0

The ACR Specification defines a form factor and interfaces for multiple and varied communications and audio subsystem designs in desktop Original Equipment Manufacturer (OEM) personal computers. Building on first generation PC motherboard riser architecture, ACR expands the riser card definition beyond the limitation of audio and modem codecs, while maintaining backward compatibility with legacy riser designs through an industry standard connector scheme. The ACR interface combines several existing communications buses, and introduces new and advanced communications buses answering industry demand for low-cost, high-performance communications peripherals.

The ACR Specification supports modem, audio, Local Area Network (LAN), and Digital Subscriber Line (DSL). Pins are reserved for future wireless bus support. Beyond the limitations of first generation riser specifications, the ACR Specification enables riser-based broadband communications, networking peripheral and audio subsystem designs. ACR accomplishes this in an open-standards context.

An overview of the contents of the ACR Specification in .PDF format is available for viewing or download.

Key Benefits

The ACR Specification provides the following technology, cost and integration benefits:

	Allows diverse and scalable communications, networking and audio functions in a flexible combination of hardware and software cores
	Supports simultaneous AMR, multiple network interfaces, and a DSL interface on a single riser card
	Provides multiple communications functions without using multiple PCI slots
	Frees multiple PCI bus slots for use by other peripherals
	Enhances or replaces discreet silicon hardware cores with software facilitating integration of core logic and peripherals
	Preserves choice in selection of discreet silicon components to promote industry innovation and product differentiation
	Adds interfaces and collects the RJ-11 communications and networking functions, such as analog modems, HomePNA networking and DSL through a single jack
	Allows risers to receive applicable industry and agency approvals independent of the motherboard, reducing approval time requirements and accelerating design and release of new motherboards

The ACR interface and connector scheme provide the following key benefits:

	Expands the number of signaling pins
	Uses an existing high-volume, low-cost 120 pin PCI A-stagger connector
	Supports future ACR extensions including multiple xDSL Codecs, faster xDSL devices, and reserved wireless interface pins

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Copyright � 2000 Advanced Communication Riser SIG. Last modified on May 06, 2000