Aopen s651m 사용자 설명서

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Connecting CNR (Communication and Network Riser) 
Expansion Slot 
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 reserves CNR slot for the option of modem function. Note that you can 
still use PCI modem card. Please note that if you want to use CNR audio card on 
CNR slot, you must disable the sound output of CODEC from BIOS to prevent the 
CODEC from making out noises at the same time. 
 
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