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 Audio/modem_riser
) slots, and a competitor and alternative to Communications and Networking Riser
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
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, since the connectors are identical to the PCI connectors already purchased in quantity. New features supported by ACR include standards for an EEPROM for storing model and vendor information, USB support, and the Integrated Packet Bus for Digital Subscriber Line (DSL), cable modem, and wireless networking support.
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.
ACR is rendered obsolete by discrete components mounted on the motherboard.