User guide

Glossary
1553-ZAT 759 94 Uen A – October 2004
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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 w ithin 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.
WAN – Wide Area Network
Any network spread over a large
geographical area, such as a country or
continent. With respect to the HM410dp,
WAN refers to the Internet.