Avaya Configuring ATM Services Bedienungsanleitung Seite 47
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Understanding ATM Concepts
114056 Rev. A 2-7
The following layers relate directly to how Bay Networks routers support ATM:
• ATM layer
• ATM adaptation layer (AAL)
The ATM layer defines how two nodes transmit information between them. It is
concerned with the format and size of the cells and the contents of the headers.
The addresses of the cells are meaningful only to the two adjacent local nodes
(that is, usually not to the end nodes).
The ATM adaptation layer (AAL) converts higher-layer protocol data into formats
that are compatible with the requirements of the ATM layer, enabling ATM to
handle different types of information all within the same format.
The AAL is divided into two sublayers: the convergence sublayer (CS) and the
segmentation and reassembly (SAR) sublayer. These two sublayers convert
variable-length messages into 48-byte segments, while ensuring the integrity of
the data.
The CCITT (now ITU-T) has defined different types of AALs to handle different
kinds of traffic. Bay Networks ATM routers support AAL 5.
ATM Adaptation Layer (AAL5)
Bay Networks ATM routers support a CS function compatible with AAL 5, as
defined in Section 1 of the CCITT (now ITU-T) B-ISDN Protocol Reference
Model (PRM).
In AAL 5, only a trailer attaches to the data from the higher layer protocols to
create a CS PDU. AAL 5 divides the PDU into a 48-octet SAR PDU; however, it
does not add an SAR header and trailer. This 48-octet SAR PDU becomes the
payload of the ATM cell (Figure 2-5).
- Configuring ATM 1
- Services 1
- Bay Networks Software License 3
- (continued) 4
- Contents 5
- 114056 Rev. A 10
- About This Guide 19
- Before You Begin 20
- Conventions 20
- Acronyms 21
- World Wide Web 27
- Customer Service FTP 27
- Support Source CD 28
- CompuServe 28
- InfoFACTS 29
- How to Get Help 29
- Chapter 1 31
- Starting ATM 31
- Adding ATM to the Router 32
- Defining a Service Record 33
- 114056 Rev. A 1-5 35
- Supported Protocols 36
- Adding PVCs 38
- Chapter 2 41
- Understanding ATM Concepts 41
- 2-2 114056 Rev. A 42
- Figure 2-2. ATM Cell Header 42
- Data Transmission 43
- VP = Virtual path 44
- VC = Virtual channel 44
- Physical Layer 45
- ATM Layer 46
- ATM Adaptation Layer (AAL5) 47
- 2-8 114056 Rev. A 48
- Data Encapsulation 49
- 2-10 114056 Rev. A 50
- Encapsulation Rules for PVCs 52
- PVC Access Methods 53
- 2-14 114056 Rev. A 54
- Hybrid Access 55
- 2-16 114056 Rev. A 56
- Figure 2-8. Hybrid PVCs 56
- SVC Access Methods 58
- ATM Traffic Parameters 58
- Variable Bit Rate 59
- Available Bit Rate 59
- Rules for Editing Protocols 60
- ARP and Inverse ARP Support 60
- ATM Error Checking 61
- Converting Mb/s to Cells/s 61
- Example of an ATM Network 62
- Hardware Devices 64
- 2-26 114056 Rev. A 66
- For More Information 68
- Chapter 3 71
- 3-2 114056 Rev. A 72
- ATM Address Resolution 73
- 3-4 114056 Rev. A 74
- 114056 Rev. A 3-5 75
- Chapter 4 77
- LAN Emulation Components 78
- LAN Emulation Server 79
- Broadcast and Unknown Server 79
- 4-4 114056 Rev. A 80
- Initial State 81
- LECS Connect State 81
- Configure State 81
- Join State 81
- Initial Registration State 82
- BUS Connect State 82
- Operational State 82
- Chapter 5 85
- Customizing an ATM Line 85
- 5-2 114056 Rev. A 86
- Assigning the Framing Mode 87
- Defining ATM Cell Insertion 88
- Defining the Interface MTU 89
- 5-6 114056 Rev. A 90
- Specifying DS3 Line Build Out 92
- Chapter 6 95
- Service Records 95
- Autogenerating ATM Addresses 96
- Assigning ATM Addresses 97
- 6-4 114056 Rev. A 98
- Entering an Emulated LAN Name 100
- Defining an Emulated LAN Type 100
- Defining the MTU 101
- Where to Go Next 102
- Chapter 7 103
- Customizing PVCs 103
- Setting a VCI Number 104
- Setting the PCR 105
- Configuring ATM Services 106
- 7-4 114056 Rev. A 106
- Table 7-1. Valid PCR Ranges 106
- Setting the SCR 107
- 7-6 114056 Rev. A 108
- Table 7-2. Valid SCR Ranges 108
- Setting the MBS 109
- Setting the Transmit SDU Size 110
- Setting the Receive SDU Size 110
- Chapter 8 113
- Specifying an Owner 114
- Entering an ELAN Name 114
- Entering a LES ATM Address 114
- Selecting a Configuration Mode 115
- 8-4 114056 Rev. A 116
- Setting the Control Timeout 117
- Setting the Aging Time 118
- 114056 Rev. A 8-7 119
- Setting the Flush Timeout 120
- Entering a LECS ATM Address 121
- Chapter 9 123
- Customizing Signaling 123
- Assigning a Protocol Standard 124
- Setting Connection Thresholds 125
- Setting Signaling Timers 126
- 9-6 114056 Rev. A 128
- 9-8 114056 Rev. A 130
- Defining Retransmissions 131
- Pacing Calls 131
- Chapter 10 133
- Customizing ILMI 133
- Setting the ILMI Get Timer 134
- Setting the ILMI Set Timer 135
- Chapter 11 137
- Changing the ILMI VPI Number 138
- Changing the ILMI VCI Number 138
- Table 11-1. Valid PCR Ranges 139
- Table 11-2. Valid SCR Ranges 141
- Chapter 12 145
- Customizing SAAL 145
- Enabling or Disabling SAAL 146
- Modifying SAAL Timers 146
- Defining PDU Values 148
- Appendix A 151
- Site Manager Parameters 151
- A-2 114056 Rev. A 152
- Using the Menu Path 153
- A-4 114056 Rev. A 154
- 155
- 158
- 162
- A-14 114056 Rev. A 164
- A-18 114056 Rev. A 168
- 170
- A-22 114056 Rev. A 172
- 174
- A-26 114056 Rev. A 176
- A-28 114056 Rev. A 178
- A-30 114056 Rev. A 180
- 181
- 182
- A-34 114056 Rev. A 184
- A-38 114056 Rev. A 188
- A-40 114056 Rev. A 190
- 191
- A-42 114056 Rev. A 192
- A-44 114056 Rev. A 194
- A-46 114056 Rev. A 196
- A-48 114056 Rev. A 198
- A-50 114056 Rev. A 200
- ILMI category 202
- A-54 114056 Rev. A 204
- A-56 114056 Rev. A 206
- A-58 114056 Rev. A 208
- A-60 114056 Rev. A 210
- 212
- A-64 114056 Rev. A 214
- 216
- A-68 114056 Rev. A 218
- A-70 114056 Rev. A 220
- Appendix B 221
- B-2 114056 Rev. A 222
- ATM FRE2 Line Parameters 224
- ATM ARE Line Parameters 224
- (continued) 225
- B-6 114056 Rev. A 226
- Appendix C 229
- ATM Sample Log 229
- C-2 114056 Rev. A 230
- C-4 114056 Rev. A 232
- C-6 114056 Rev. A 234
- C-8 114056 Rev. A 236
- C-10 114056 Rev. A 238
- C-12 114056 Rev. A 240
- C-14 114056 Rev. A 242
- C-16 114056 Rev. A 244
- C-18 114056 Rev. A 246
- C-20 114056 Rev. A 248
- C-22 114056 Rev. A 250
- C-24 114056 Rev. A 252
- C-26 114056 Rev. A 254
- 114056 Rev. A Index-1 257
- 114056 Rev. A Index-3 259
- 114056 Rev. A Index-5 261
- 114056 Rev. A Index-7 263
- 114056 Rev. A Index-9 265
- 114056 Rev. A Index-11 267
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