AMR stands for Audio Modem Riser. CNR or Communications and Networking Risers also belong to this category. An AMR is a card that supports a sound or modem function. AMR and CNR are not expansion cards or expansion buses in the ordinary sense. These are dedicated connectors for cards specific to a particular motherboard design. AMR and CNR cards are not general-purpose devices the way a PCI card is.
An AMR is used in place of a normal hardware modem. The AMR is an interface between the motherboard and a phone line. It relies totally on the CPU and has no secondary, built-in processing ability. AMRs are inexpensive and easily upgradeable. If you plug an AMR device in rated for 28K modem speeds and want to upgrade to 56K, all you would need to do is go to the manufacturers site and download the proper driver and the upgrade would be complete. While AMR is cheap and easy, it is not a particularly reliable technology (you get what you pay for). A hardware modem, which does have built in processing abilities, is a better buy and provides service that is more reliable.
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