Communications and networking riser

Communications and networking riser (CNR) is a slot found on certain personal computer motherboards and used for specialized networking, audio, or telephony equipment. A motherboard manufacturer may choose to provide such functionality in any combination on a CNR card. Introduced by Intel in 2000, CNR slots were once commonly found on Pentium III–class motherboards, but have since been phased out in favor of on-board or embedded components.

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