What protocols could exist on top of the music data? I know the ones underneath. But how can the bandwidth be more? Interesting if true.
I guess it depends on your point of view.
There's the streaming protocol MJ uses.
Then there's Transmission Control Protocol (TCP)
Then the Internet Protocol (IP)
Then any other protocols used by your provider such as Asynchronous Transfer Mode (ATM),
Point-to-Point Protocol over ATM (PPPoA)
Point-to-Point Protocol over Ethernet (PPPoE)
etc.
All of those take up part of the bandwidth your service provider advertizes (assuming you actually
get the rate your service provider advertizes).
I have 640/640 DSL service which means that the line rate is 640 Kilobits per second in both directions. The combined protocol overhead of TCP/IP and ATM eats about 10-12% of that which means that the maximum effective data transfer rate between applications I could ever expect is between 560-576 kbps.
Thankfully, I have a great ISP and I have never seen less than the maximum.