Panasonic 1200N Manual De Usuario
Glossary
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Centillion 1200N ATM Switch User Manual
B-85
NTP 297-8103-903
VPI
Virtual Path Identifier: An eight bit field in the ATM cell header which indicates
the virtual path over which the cell should be routed.
the virtual path over which the cell should be routed.
VPL
Virtual Path Link: A means of unidirectional transport of ATM cells between the
point where a VPI value is assigned and the point where that value is translated or
removed.
point where a VPI value is assigned and the point where that value is translated or
removed.
VPT
Virtual Path Terminator: A system that unbundles the VCS of a VP for independent
processing of each VC.
processing of each VC.
VS
Virtual Scheduling: Virtual Scheduling is a method to determine the conformance
of an arriving cell. The virtual scheduling algorithm updates a Theoretical Arrival
Time (TAT), which is the "nominal" arrival time of the cell assuming that the active
source sends equally spaced cells. If the actual arrival time of a cell is not "too"
early relative to the TAT, then the cell is conforming. Otherwise the cell is non-
conforming.
of an arriving cell. The virtual scheduling algorithm updates a Theoretical Arrival
Time (TAT), which is the "nominal" arrival time of the cell assuming that the active
source sends equally spaced cells. If the actual arrival time of a cell is not "too"
early relative to the TAT, then the cell is conforming. Otherwise the cell is non-
conforming.
VS
Virtual Source. Refer to VS/VD.
VS/VD
Virtual Source/Virtual Destination: An ABR connection may be divided into two
or more separately controlled ABR segments. Each ABR control segment, except
the first, is sourced by a virtual source. A virtual source implements the behavior
of an ABR source endpoint. Backwards RM-cells received by a virtual source are
removed from the connection. Each ABR control segment, except the last, is
terminated by a virtual destination. A virtual destination assumes the behavior of
an ABR destination endpoint. Forward RM-cells received by a virtual destination
are turned around and not forwarded to the next segment of the connection.
or more separately controlled ABR segments. Each ABR control segment, except
the first, is sourced by a virtual source. A virtual source implements the behavior
of an ABR source endpoint. Backwards RM-cells received by a virtual source are
removed from the connection. Each ABR control segment, except the last, is
terminated by a virtual destination. A virtual destination assumes the behavior of
an ABR destination endpoint. Forward RM-cells received by a virtual destination
are turned around and not forwarded to the next segment of the connection.
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WAN
Wide Area Network: A network which spans a large geographic area relative to
office and campus environment of LAN (Local Area Network). WAN is
characterized by having much greater transfer delays due to laws of physics.
office and campus environment of LAN (Local Area Network). WAN is
characterized by having much greater transfer delays due to laws of physics.