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Prestige 623ME-T User’s Guide
Virtual Circuit Topology E-1
Appendix E
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 E-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.
Your service provider should supply you with VPI/VCI numbers.
- Prestige 623ME-T 1
- Copyright 3
- (FCC) Interference Statement 5
- ZyXEL Limited Warranty 7
- Customer Support 9
- Table of Contents 11
- List of Figures 17
- List of Tables 21
- List of Charts 23
- Preface 25
- Introduction to DSL 27
- Part I: 29
- Chapter 1 31
- 1.3.1 Internet Access 33
- Chapter 2 35
- Wizard Setup 36
- Navigation panel 36
- 2.4 Configuring Password 37
- 2.5 Resetting the Prestige 38
- Chapter 3 39
- 3.3 Multiplexing 40
- 3.4 VPI and VCI 40
- DESCRIPTION 41
- 3.7 IP Address Assignment 42
- 3.8 NAT 43
- 3.9.2 PPPoE 44
- 3.10 DHCP Setup 45
- 3.10.1 IP Pool Setup 46
- Part II: 47
- Chapter 4 49
- LAN Setup 49
- 4.4 LAN TCP/IP 50
- 4.4.3 RIP Setup 51
- 4.4.4 Multicast 51
- 4.5 Configuring LAN 52
- LAN Setup 4-5 53
- Table 4-1 LAN 53
- Part III: 55
- Chapter 5 57
- 5.2.1 Advantages of SUA 58
- 5.3 Selecting the NAT Mode 60
- 5.4 Configuring SUA Server 60
- NAT 5-5 61
- 5-6 NAT 62
- Chapter 6 63
- Dynamic DNS Setup 63
- Part IV: 65
- Chapter 7 67
- 7.2 Telnet 68
- 7.3 FTP 68
- 7.4 Web 69
- Table 7-1 Remote Management 70
- Chapter 8 71
- 8.2 UPnP and ZyXEL 72
- Part V: 79
- Chapter 9 81
- Maintenance 9-3 83
- Table 9-1 System Status 83
- 9.2.1 System Statistics 84
- Maintenance 9-5 85
- 9.3 DHCP Table Screen 86
- 9.4 Diagnostic Screens 86
- 9.5 Firmware Screen 90
- Part VI: 93
- Chapter 10 95
- Introducing the SMT 95
- 10-2 Introducing the SMT 96
- ? > or ChangeMe 97
- Chapter 11 101
- General Setup 101
- 11-4 General Setup 104
- Chapter 12 105
- LAN Setup 105
- 12-4 LAN Setup 108
- Chapter 13 109
- Internet Access 109
- Chapter 14 113
- Remote Node Configuration 113
- 14.3 Metric 117
- 14.5 Remote Node Filter 121
- Separate VPI and 124
- VCI numbers must 124
- Only one set of VPI 125
- Chapter 15 127
- Static Route Setup 127
- Static Route Setup 15-3 129
- 15-4 Static Route Setup 130
- Chapter 16 131
- Bridging Setup 131
- Bridge= Yes 132
- Edit IP/Bridge= Yes 132
- 16-4 Bridging Setup 134
- Chapter 17 135
- NAT= SUA Only 136
- 17.3 NAT Server Setup 137
- 17.4 General NAT Examples 137
- 17.4.2 How to configure NAT 138
- Part VII: 141
- Chapter 18 143
- Filter Configuration 143
- Outgoing 144
- Filter Rule 145
- Filter Set 145
- 18.3.1 TCP/IP Filter Rule 149
- Filter Configuration 18-9 151
- 18.3.2 Generic Filter Rule 154
- 18.4 Filter Types and NAT 156
- 18.5 Example Filter 156
- 18.6.1 Ethernet Traffic 160
- 18.6.2 Remote Node Filters 160
- Chapter 19 163
- SNMP Configuration 163
- 19.2 Supported MIBs 164
- 19.3 SNMP Configuration 164
- 19.4 SNMP Traps 166
- Chapter 20 167
- 20.3 System Information 169
- 20.4 Log and Trace 171
- 20.4.2 Syslog and Accounting 172
- 20.5 Diagnostic 174
- Chapter 21 177
- Maintenance 177
- 21.2 Backup Configuration 178
- 21.2.1 Backup Configuration 179
- 21.2.4 GUI-based FTP Clients 180
- 21.2.7 TFTP Command Example 181
- 21.3 Restore Configuration 182
- 21.3.1 Restore Using FTP 183
- 21.4.1 Firmware File Upload 184
- 21.4.5 TFTP File Upload 186
- Chapter 22 189
- System Maintenance 189
- 22.2 Call Control Support 190
- 22.3 Time and Date Setting 191
- 10. Time and Date Setting 192
- 22.3.1 Resetting the Time 193
- Chapter 23 195
- Remote Management 195
- 23.4 System Timeout 197
- Chapter 24 199
- IP Policy Routing 199
- IP Policy Routing 24-3 201
- 24.5 Applying an IP Policy 203
- IP Policies= 1,2 207
- Chapter 25 209
- Call Scheduling 209
- Part VIII: 213
- Appendix A 215
- Troubleshooting 215
- A.2 Telnet 216
- A.3 Web Configurator 217
- A.5 LAN Interface 218
- A.6 WAN Interface 218
- A.7 Internet Access 219
- A.8 Remote Node Connection 220
- Appendix B 221
- IP Subnetting 221
- B-8 IP Subnetting 228
- Appendix C 229
- Appendix D 231
- Installing Components 232
- Configuring 232
- Verifying Settings 234
- Windows 2000/NT/XP 235
- Macintosh OS 8/9 239
- Appendix E 243
- Virtual Circuit Topology 243
- Appendix F 245
- Splitters and Microfilters 245
- Appendix G 247
- Appendix H 249
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