Communications and networking riser
Slot found on certain PC motherboards used for specialized equipment / From Wikipedia, the free encyclopedia
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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.[1] Introduced by Intel in 2000,[2] 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.[3]