History
Intel developed the CNR slot to replace its own Audio/modem riser (AMR) technology, drawing on two distinct advantages over the AMR slot it replaced; CNR was both capable of being either software based (CPU-controlled) or hardware accelerated (dedicated ASIC), and was plug-and-play compatible. On some motherboards, a CNR slot replaced the last PCI slot, but most motherboard manufacturers engineered boards which allow the CNR and last PCI slot to share the same space.
As of 2007, with the integration of components such as Ethernet and audio into the motherboard, the CNR is obsolete, and is not found on the most recent full sized motherboards. It can still be found on smaller form-factor motherboards (like microATX) with lower end processors, where it continues to perform its original function.
Read more about this topic: Communications And Networking Riser
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