The Sound of a 56k Modem Connecting...

If you're of a certain age (translation: if you're an old fart like me) and you used computers in the '80s and '90s, then the sound of a 56k modem connecting (generally to your dial-up ISP) is one that's probably burned into your little grey cells.  While those noises are familiar, most likely you have no idea what they all meant.  Here's a nice explanation, complete with graphic...digital archaeology :)