Dynamix UM-A User Manual page 146

USB : Universal Serial Bus: A standard interface between a computer and a peripheral (printer,
external drives, digital cameras, scanners, network interface devices, modems, etc.) that allows a
transfer rate of 12Mbps.
UDP : User Datagram Protocol: A protocol that is used instead of TCP when reliable delivery is not
required. Unlike TCP, UDP does not require an acknowledgement (handshake) from the receiving end.
UDP sends packets in one-way transmissions.
VBR-nrt : Variable Bit Rate – non real time: With VBR-nrt, cell transfer is variable upon certain
criteria.
VC : Virtual Circuit: A virtual circuit is a circuit in a network that appears to be a physically discrete
path, but is actually a managed collection of circuit resources that allocates specific circuits as needed
to satisfy traffic requirements.
VCI : Virtual Channel Identifier: A virtual channel identified by a unique numerical tag that is defined
by a 16-bit field in the ATM cell header. The purpose of the virtual channel is to identify where the cell
should travel.
VC-Mux : Virtual Circuit based Multiplexing: In VC Based Multiplexing, the interconnect protocol of
the carried network is identified implicitly by the VC (Virtual Circuit) connecting the two ATM
stations (each protocol must be carried over a separate VC).
VPI :Virtual Path Identifier: Virtual path for cell routing indicated by an eight bit field in the ATM cell
header.
WAN : Wide Area Network: A WAN covers a large geographical area. A WAN is consisted of LANs
and the Internet is consisted of WANs.
4/1 Port ADSL Router P 145