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CNR is a riser card specification to replace the AMR (Audio/Modem Riser) that supports V.90 analog modem, multi-channel audio, and
phone-line based networking. Owing to CPU computing power getting stronger, the digital processing job can be implemented in main
chipset and share CPU power. The analogy conversion (CODEC) circuit requires a different and separate circuit design, which is put on
CNR card. This motherboard implements sound CODEC on board, but reserve CNR slot for the option of modem function. Note that you
can still use PCI modem card.
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