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Glossary
EN/LZT 108 6492 R2 - October 2003
127
Upstream
The direction of an upstream signal is from the user's computer to the
ISP/service provider (uploading).
- V -
VC
A VC (Virtual Circuit) is a connection from your ADSL router to your ISP.
VPI and VCI
A VPI (Virtual Path Identifier) is an 8-bit field while VCI (Virtual Channel
Identifier) is a 16-bit field in the ATM cell header. A VPI identifies a link
formed by a virtual path and a VCI identifies a channel within a virtual path.
In this way, the cells belonging to the same connection can be
distinguished. A unique and separate VPI/VCI identifier is assigned in
advance to indicate which type of cells follow; unassigned cells, physical
layer OAM cells, metasignalling channel or a generic broadcast signaling
channel. Your ISP should supply you with the values.
- W -
WAN
Short for Wide Area Network. A computer network that spans a relatively
large geographical area. Typically, a WAN consists of two or more Local
Area Networks (LANs). Computers connected to a WAN are often
connected through public networks, such as the telephone system.