After the broadband terminal is installed on the HG520C

Hi, friend.

That's a good question, but I need to make it clear that neither of these factors has any effect.

Because the terminal uses the frequency division multiplexing (FDM) and splitter technologies to separate voice signals from data signals. Although the two types of signals are transmitted through one telephone line, they are carried by different frequency bands. Therefore, they do not interfere with each other. In this case, you can make a telephone call and access the Internet simultaneously, without degrading call quality or lowering the Internet access rate. 

Thanks.