Appendix D: Glossary

 

 

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 Megabit 700F

 

Modem.

Megabit Modem 400F, 500L, 600F, and 700F User Manual

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