A good overview of telecommunications terminology for people with an Internet background: O'Reilly Network -- Telecom Terms and Concepts. This sort of open exchange of information could help the so-called "Bell-heads" (telecoms guys) and "net heads" (Internet guys) get along (c.f. Frieden 2001). They kind of have to if everythings is going to be over TCP/IP (and as I would argue IPv6).