ForeRunner
ATM Switch Network Configuration Manual
1 - 3
Configuring PVCs
Co
nfigu
ri
ng PVCs
1.2 Virtual Paths
Virtual paths, which are carried within a physical transit medium (e.g., DS1, E1, DS3, E3,
OC3c, or OC12c link), are used to establish connections between two nodes in an ATM net-
work. Many virtual paths can be transmitted within a single physical link. Two types of vir-
tual paths exist: virtual path connections (VPCs), also known as through paths, and
originating/terminating paths, also known as virtual path terminators (VPTs). VPCs allow
virtual paths to be cross-connected at a switch node while VPTs allow virtual channels (VCCs)
to be cross-connected or switched at a switch node.
Figure 1.2 -
Virtual Channels in a Virtual Path
A single virtual path can be used to route many virtual channels through the ATM network.
Because a virtual path simply routes virtual channels through the network, a cell is guaran-
teed to have the same VCI when it exits the virtual path as it had when it entered the virtual
path.
Figure 1.3 -
An Example of a Virtual Path
Virtual
Path
Virtual
Channels
Medium
VPI: Z, VCI: Y
VPI: X, VCI: Y
ATM
Network
cell
cell
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Summary of Contents for forerunner series
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Page 16: ...TOC 10 ForeRunner ATM Switch Network Configuration Manual Table of Contents ...
Page 20: ...LOF 4 ForeRunner ATM Switch Network Configuration Manual List of Figures ...
Page 22: ...LOT 2 ForeRunner ATM Switch Network Configuration Manual List of Tables ...
Page 30: ...viii ForeRunner ATM Switch Network Configuration Manual Preface ...
Page 144: ...3 58 ForeRunner ATM Switch Network Configuration Manual Configuring an Emulated LAN ...
Page 180: ...6 12 ForeRunner ATM Switch Network Configuration Manual ATM Forum PNNI ...
Page 220: ...9 6 ForeRunner ATM Switch Network Configuration Manual Configuring Timing ...
Page 300: ...D 24 ForeRunner ATM Switch Network Configuration Manual Configuring FramePlus Modules ...
Page 308: ...Acronyms 8 ForeRunner ATM Switch Network Configuration Manual Acronyms ...
Page 346: ...Glossary 38 ForeRunner ATM Switch Network Configuration Manual Glossary ...
Page 352: ...Index 6 ForeRunner ATM Switch Network Configuration Manual Index ...