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3-2
Cisco AS5800 Operations, Administration, Maintenance, and Provisioning Guide
DOC-7810814=
Chapter 3 Operations
Verifying Modem Performance
Async DataComm Model
Figure 3-1 shows how traditional DTE-to-DCE relationships map to a Cisco network access server
(NAS). Data terminal equipment (DTE) uses data communication equipment (DCE) to send data over
the PSTN.
In the context of EIA/TIA-232 and Cisco IOS software:
• The DTE is the client PC and the Cisco IOS TTY lines.
• The DCE is the client modem and the modem inside the NAS.
• The dashed line between the DCEs is the modem carrier running on top of the voiceband circuit
through the PSTN. EIA/TIA-232 (whether physical or logical) is used on the DTE lines, not on the
DCE link.
• The PSTN circuit runs through the circuit-switched half of the NAS.
Figure 3-1 A Standard Dialup Connection
Logical Packet and Circuit Components of a NAS
The NAS functions as a gateway between two different networks:
• A circuit-switched network (for example, the PSTN)
• A packet-switched network (for example, the Internet)
The NAS is half a circuit switch and half a packet switch (router). EIA/TIA-232 signaling on the line is
displayed by the show line command and debug modem command. Figure 3-2 shows the modem access
connectivity path.
DTE
(Cisco IOS line)
33177
DTE
(Client PC)
DCE
(Client modem)
DCE link (circuit)
PSTN
DTE link
DTE link
Physical
RS-232 cable
Virtual
RS-232 interface
IOS line (DTE)
DCE
(NAS modem)
Inside a Cisco
network access server
- Cisco AS5800 Operations 1
- Provisioning Guide 1
- CONTENTS 3
- 2 Commissioning 2-1 4
- 3 Operations 3-1 5
- 4 Administration 4-1 5
- 5 Maintenance 5-1 6
- 6 Provisioning 6-1 6
- Contents 7
- Document Objectives 9
- Audience 9
- Document Organization 10
- Document Conventions 10
- Safety Warnings 11
- Related Documentation 12
- For More Information 14
- Obtaining Documentation 14
- Ordering Documentation 15
- Documentation Feedback 15
- Cisco.com 15
- Technical Assistance Center 16
- Introduction 19
- Chapter1 Introduction 20
- Cisco AS5800 Hardware Review 21
- System Architecture 22
- ROM Monitor 22
- Chapter 1 Introduction 23
- IP Subnetting Plan 24
- Device Parameters 25
- User Interface Command Modes 26
- Command Modes 27
- Context-Sensitive Help 28
- Basic Cisco AS5800 Start Up 29
- Cisco AS5800 First-Time Boot 33
- Using the Setup Script 34
- Passwords 35
- Commissioning 43
- Chapter 2 Commissioning 44
- Call-Processing Components 45
- Task 1. Verifying Basic Setup 47
- Inspecting the Dial Shelf 51
- DSC Troubleshooting Tips 52
- Using DSIP 54
- Investigating Memory Usage 61
- Verifying CPU Utilization 63
- Table 2-5 Local AAA Commands 65
- Setting Up a Log In Banner 66
- Configuring Basic IP 67
- Table 2-7 Alarm Conditions 72
- Table 2-9 IP Routing Commands 77
- Figure 2-6 Test Environment 79
- Operations 83
- Async DataComm Model 84
- Verifying Modem Performance 86
- V.34 Basic Rules 89
- V.90 Basic Rules 90
- Configuring IPCP Options 108
- Configuring LCP Options 109
- Enabling PPP Autoselect 110
- Troubleshooting Flow Diagrams 113
- DOC-7810814= 114
- Chapter 3 Operations 114
- Inspecting Active Call States 116
- Modem Management Operations 122
- Managing Modem Firmware 123
- Inspecting Modem Firmware 124
- Upgrading Modem Firmware 126
- Using Modem Call-Record Terse 136
- Using SNMP 136
- Administration 139
- Table 4-1 RMON Groups 140
- Chapter 4 Administration 141
- Enabling Syslog 142
- Enabling SNMP 145
- Table 4-4 SNMP Commands 146
- XL1 installed 148
- Access Service Security 151
- Configuring RADIUS 152
- RADIUS Operation 153
- AAA Commands 161
- RADIUS Commands 161
- Configuring TACACS+ 162
- Enabling AAA Globally 167
- Identify a List Name 168
- • Users Dialing In Using PPP 170
- Users Dialing In Using PPP 171
- Login Authentication Example 171
- TACACS+ Authorization 172
- Authorization Examples 175
- TACACS+ Security Examples 176
- Maintenance 179
- Chapter 5 Maintenance 180
- Replacement Procedures 180
- Tools and Parts Required 182
- Removing a Power Entry Module 182
- –48V –48V 185
- Replacing a Filter Module 186
- Removing a Filter Module 187
- Replacing the Filter Module 190
- Panel fastener 194
- Connecting the Cables 197
- Replacing a Flash Memory Card 200
- Removing a Flash Memory Card 202
- Replacing the Blower Assembly 203
- Port adapter lever 206
- Slot number 206
- Unlocked position 206
- Locked position 206
- ORK PROCESSING ENGINE-150 211
- Power switches 211
- AC-input power 214
- AC power cable 214
- Figure 5-30.) 217
- Figure 5-31.) 218
- Filter module 219
- Back cover 219
- Backplane module 220
- Replacing the Backplane 221
- Troubleshooting 222
- AS5800 Dial Shelf 223
- Feature Cards 223
- Controller T1 223
- General Configuration 224
- Async Calls 225
- Interactive Async User 225
- Interactive Users 226
- Dedicated-PPP Users 227
- PPP Users 227
- Sync Calls 228
- SGBP Troubleshooting 229
- Provisioning 231
- Figure 6-1 Business Scenario 232
- Chapter 6 Provisioning 233
- Cisco IOS Upgrades 235
- Software Upgrade Requisites 236
- Memory Requirements 236
- Installing New IOS Software 238
- Upgrading the DSC Software 239
- Software Upgrade Verification 242
- Modem Upgrading 243
- Modem Upgrades 244
- Modem Operation at Bootup 247
- Split Dial Shelves 248
- TDM Resource Allocation 249
- Changing Slot Sets 250
- Leaving Split Mode 251
- Managing a Split Dial Shelf 253
- Explanation 254
- Router-Shelf Redundancy 257
- External Services 258
- Configuring Redundancy 258
- Redundancy Show Commands 259
- Advanced Quick Reference 261
- Functional Components 262
- Egress Interface 263
- Loopback Interface 264
- Routing Protocol 265
- Ingress Interface 266
- T3 Ingress Configuration 267
- T1 Ingress Configuration 268
- Line Signaling 269
- D-Channels (ISDN) 270
- D-Channel Configuration 271
- AAA Plan and Requisites 272
- To Modify, Copy, & Paste 273
- Sample Configuration 273
- AAA Accounting Configuration 274
- Command Line Description 275
- Modem Pools 276
- Modem Pool Configuration 277
- TTY Line 278
- Async Interface 279
- Async Interface Configuration 280
- Dial Interface 281
- Dial Interface Configuration 282
- IP Address Pools 283
- Virtual Template 285
- SGBP Requisites 286
- SGBP Configuration 286
- VPDN Requisites 287
- VPDN Configuration 288
- SNMP Requisites 288
- SNMP Configuration 288
- Virtual Profiles 289
- Multilink Virtual Template 290
- V.120 Support 291
- Global Parameters 292
- Global Parameter Requisites 293
- Final Operational Requisites 294
- GLOSSARY 297
- Glossary 298
- World Wide Web (WWW) 315
- OL-0552-01 317
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