Networking Acronyms

V.24
ITU-T standard for a physical layer interface between DTE and DCE. V.24 is essentially the same as the EIA/TIA-232 standard. See also EIA/TIA-232.
V.25bis
ITU-T specification describing procedures for call setup and tear down over the DTE-DCE interface in a PSDN.
V.32
ITU-T standard serial line protocol [...]

U interface
The interface between the telco and the user, also known as the local digital subscriber line (DSL) loop.
UDP
User Datagram Protocol. Connectionless transport layer protocol in the TCP/IP protocol stack. UDP is a simple protocol that exchanges datagrams without [...]