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Appendix C: Glossary

MM701F User Manual 81

UDP User Datagram Protocol is a transport protocol used to map inbound traffic (from a

remote IP address) to an internal (LAN) IP address. Uses a protocol port number for

the destination at the remote location.

upstream traffic Communications from a user to a service provider.

VCI Virtual Channel Identifier is a 16-bit field addressing identifier in the header of an ATM

cell used to route cell traffic. It identifies a particular VC link for a given VP.

VCMUX Virtual Channel Multiplexer-based encapsulation used for networks with large

numbers of virtual channels making it practical to carry a single protocol per virtual

channel.

VC A Virtual Channel is a logical connection in the ATM network over which ATM cells are

transmitted.

VPI Virtual Path Identifier is an 8-bit field addressing identifier in the header of an ATM

cell that is used to route cell traffic. It identifies a particular VP link.

VP A Virtual Path is a group of VCs carried between two points. The VP provides a means

of bundling traffic traveling in the same direction. VPs are defined by a unique VPI

value.

WAN Wide Area Network is a network consisting of nodes located across a large

geographical area. Also, the connection between a service provider and MM701F

Modem.

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