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Prestige 650HW ADSL Router User’s Guide
F Virtual Circuit Topology
Appendix C
Virtual Circuit Topology
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 circuit end points
Diagram 5 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.
Your service provider should supply you with VPI/VCI numbers.
- Prestige 650HW 1
- Copyright 2
- (FCC) Interference Statement 3
- ZyXEL Limited Warranty 4
- Customer Support 5
- Table of Contents 6
- List of Figures 11
- List of Tables 14
- Preface 16
- What is DSL? 18
- Getting Started 19
- Chapter 1 21
- • Protocol Support 23
- • Other PPPoE Features 25
- • Diagnostics Capabilities 25
- 1.3.1 Internet Access 26
- Chapter 2 29
- 2.2.1 DSL Port 31
- 2.4 P650HW with POTS 32
- 2.4.2 Telephone Microfilters 33
- 2.5 P650HW With ISDN 34
- 2.7.3 Entering Password 35
- 2.8 Resetting the Prestige 36
- 2.11 General Setup 40
- 2.11.1 Dynamic DNS 41
- 2.12 LAN Setup 43
- Chapter 3 45
- Internet Access 45
- 3.3 TCP/IP Parameters 46
- 3.3.2 Private IP Addresses 47
- 3.3.3 RIP Setup 47
- 3.3.4 DHCP Configuration 48
- 3.4 IP Multicast 49
- 3.5 IP Policies 49
- 3.6 IP Alias 49
- 3.6.1 IP Alias Setup 50
- 3.7 Route IP Setup 52
- Internet Access 3-9 53
- 3.9 Wireless LAN 55
- 3.9.2 Wireless LAN Setup 57
- 3-14 Internet Access 58
- Internet Access 3-15 59
- 3.10 Internet Access Setup 60
- 3.11 VPI and VCI 60
- 3.12 Multiplexing 60
- 3.13 Encapsulation 60
- 3.14 IP Address Assignment 61
- 3.15.1 Traffic Shaping 63
- Internet Access 3-21 65
- Advanced Applications 67
- Chapter 4 69
- Remote Node Configuration 69
- 4.2 Remote Node Setup 75
- 4.3 Remote Node Filter 77
- Chapter 5 79
- 5.1.2 IP Static Route Setup 83
- FIELD DESCRIPTION 85
- Chapter 6 87
- Bridging Setup 87
- Bridging Setup 6-3 89
- Chapter 7 91
- 7.1.2 What NAT Does 92
- 7.1.3 How NAT Works 92
- 7.1.4 NAT Application 93
- 7.1.5 NAT Mapping Types 94
- 7.2 Using NAT 96
- 7.3 NAT Setup 98
- NAT 7-9 99
- SUA Address Mapping Set 99
- FIELD DESCRIPTION EXAMPLE 101
- 7.5 General NAT Examples 108
- 7-22 NAT 112
- NAT 7-23 113
- NAT 7-27 117
- Chapter 8 120
- Filter Configuration 120
- Outgoing 121
- Initiate call 121
- Filter Rule 122
- Filter Set 122
- 8-6 Filter Configuration 125
- 8-8 Filter Configuration 127
- 8.3.1 TCP/IP Filter Rule 128
- Filter Configuration 8-11 130
- Filter Configuration 8-13 132
- 8.3.2 Generic Filter Rule 133
- Filter Configuration 8-15 134
- 8.4 Filter Types and NAT 135
- 8.5 Example Filter 135
- 8.6.1 Ethernet Traffic 139
- 8.6.2 Remote Node Filters 139
- Chapter 9 142
- SNMP Configuration 142
- 9.2 Supported MIBs 143
- 9.3 SNMP Configuration 143
- 9.4 SNMP Traps 145
- Chapter 10 146
- 10.2 System Information 148
- 10.2.1 System Information 149
- 10.3 Log and Trace 150
- 10.3.2 Syslog and Accounting 151
- PARAMETER DESCRIPTION 152
- PPP Log 152
- 10.4 Diagnostic 153
- Chapter 11 154
- Maintenance 154
- 11.2 Backup Configuration 155
- COMMAND DESCRIPTION 157
- 11.2.4 Example: TFTP Command 158
- 11.3 Restore Configuration 159
- 11.4.1 Firmware Upload 160
- 11.4.4 TFTP File Upload 162
- 11.4.5 Example: TFTP Command 163
- Chapter 12 164
- 12.2 Call Control Support 165
- 12.3 Time and Date Setting 167
- 12.3.1 Resetting the Time 168
- Chapter 13 170
- IP Policy Routing 170
- IP Policy Routing 13-3 172
- 13.5 Applying an IP Policy 174
- 13-6 IP Policy Routing 175
- Chapter 14 180
- Call Scheduling 180
- Chapter 15 184
- Remote Management 184
- 15.6 System Timeout 187
- Additional Information 188
- Chapter 16 190
- Troubleshooting 190
- 16-2 Troubleshooting 191
- 16.6 Problems with Telnet 192
- Appendix A 194
- Wireless LAN and IEEE 802.11 194
- Appendix B 197
- Appendix C 199
- Virtual Circuit Topology 199
- Appendix D 200
- Appendix E 201
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