AOpen MX4GVR - System Components and Features

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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.