Specifications

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A-1
Appendix A
Overview of Signaling Concepts
This appendix provides an overview of the concepts for setting up signaling.
The specific type of signaling you establish depends on what equipment you
have installed and the network communications you are using. Some of the
types of signaling that can be set up are as follows:
• Classical IP
• Classical IP with the workstation as the ARPSERVER
• Classical IP with the switch as the ARPSERVER
• Network Service Access Point (NSAP) in the Device
• Permanent Virtual Circuit (PVC)
• User Network Interface (UNI) Signaling
• LAN Emulation with API
• LAN Emulation with ForeView
• IISP
• SPANS
Refer to the FORE Systems, Inc., documentation delivered with your
ForeRunner devices for specific procedures on setting up signaling.
You set up signaling for each workstation in your network to establish
mappings that route ATM cells from a source to a destination. The routes are
referred to as virtual channels and virtual paths. You can set the virtual
channels and paths to create a Permanent Virtual Circuit (PVC) for dedicated
long-term information transfer between two endpoints.
An ATM cell includes a five-byte header that contains a Virtual Path Identifier
(VPI) and a Virtual Channel Identifier (VCI). These identifiers are used by the
receiving device to determine the correct output port for the cell. The VPI and
VCI may be set to a different value at the output to be received by the next
device in the network (Figure A-1).