Mark Allums wries: > In the US, a 56k dialup running at 53k (max allowed by law, and rarely > achieved in practice) gives you just about the necessary bandwidth for > voice over IP, *and nothing else*.
That's 56k downbound. Upbound is 33k max. > Not a voice-over-IP expert, and yes, I *have* heard of Nyquist. Good. Now read Shannon. The number of bits per second you can push through a channel depends on the bandwidth _and_ the signal to noise ratio. > What modulation does Skype use? Some type of delta modulation would be > my guess for dialup, but I have no real idea. None. Skype surely uses some sort of compression, but the modem handles the physical layer using complex multitone modulation schemes. -- John Hasler -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
