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ZyXEL Communications Prestige 630 Appendix A, VPI and VCI, Diagram 1 Virtual Circuit Topology, Virtual Path, Virtual Channel, Virtual Circuit

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Prestige 630 ADSL USB Modem

Appendix A

VPI and VCI

ATM is a connection-oriented technology, meaning that it sets up virtual circuits over which end systems communicate. The terminology for virtual circuits is as follows:

Virtual Channel	Logical connections between ATM switches
Virtual Path	A bundle of virtual channels
Virtual Circuit	A series of virtual paths between end points in a network

Diagram 1 Virtual Circuit Topology

Think of a virtual path as a cable that contains a bundle of wires. The cable connects two points and wires within the cable provide individual circuits between the two points. In an ATM cell header, a VPI (Virtual Path Identifier) identifies a link formed by a virtual path; a VCI (Virtual Channel Identifier) identifies a channel within a virtual path.

The VPI and VCI identify a virtual path, that is, termination points between ATM switches. A series of virtual paths make up a virtual circuit.

VPI and VCI

Contents

ADSL USB Modem Copyright ZyXEL Limited Warranty Information for Canadian Users Federal Communications Commission (FCC) Interference Statement Customer Support Table of Contents Chapter 5 Troubleshooting Appendix A VPI and VCI List of Figures List of Diagrams List of Tables Preface Bold Arial Installing Your Modem 1.1Operating Systems Figure 1-1About This Mac 1.2Internet Account Information Table 1-1Internet Account Information 1.3Installation 1.3.1 Modem Driver Installation Figure 1-2ZyXEL Mac X Folder Figure 1-3DMG File Figure 1-4Virtual Disk Figure 1-5ModemInstaller Figure 1-6Select Install Figure 1-7Authenticate Figure 1-8Select a Destination Figure 1-9Select Driver Type Figure 1-10Set VPI and VCI Figure 1-11Select Mode and Encapsulation 1.3.2 Modem Hardware Installation Figure 1-12Back Panel Connections Figure 1-13USB Cable Connectors Figure 1-14Splitter Figure 1-15Microfilter 1.4Front Panel LEDs Figure 1-16Front Panel LEDs 1.5Front Panel LED Descriptions Table 1-2LED Descriptions Page Chapter 2 Configuring Your Macintosh for Internet Access 2.1Making a DSL Connection with RFC1483 Figure 2-1Open System Preferences Figure 2-2System Preferences Figure 2-3New Port Detected Figure 2-4Network: TCP/IP Tab 2.2Making a DSL Connection with PPPoE Figure 2-5Network: PPPoE Tab Figure 2-6PPPoE Icon Connect 2.3Making a DSL Connection with PPPoA Figure 2-7New Port Detected Figure 2-8Network Figure 2-9Network: Modem Tab Figure 2-10Network: PPP Tab Figure 2-11PPPoA Connect Icon Figure 2-12Internet Connect Icon Figure 2-13PPPoA Connect Screen Control And Status 3.1CSA 3.2CSA Icon 3.2.1 Procedure to Display the CSA Icon Figure 3-1Macintosh HD Icon 3.2.2 Icon Colors 3.3ADSL Control and Status Interface Screen Figure 3-5Launch CSA Figure 3-6Control and Status Application 3.3.1 Modem Performance 3.3.2 Connection Status 3.3.3 Device Status 3.3.4 Display Modem Status in Status Bar 3.3.5 Connect 3.3.6 Close Page Uninstalling Your Modem 4.1Uninstalling the Hardware 4.2Uninstalling the Driver Figure 4-1ZyXEL Mac X Folder Figure 4-2DMG File Figure 4-3Virtual Disk Figure 4-4ModemInstaller Figure 4-5Select Uninstall Figure 4-6Authenticate Figure 4-7Uninstall Complete Troubleshooting Table 5-1Troubleshooting Page Appendix A VPI and VCI Diagram 1 Virtual Circuit Topology Page Index