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X.25 Overview
117377-A Rev. A
1-3
Figure 1-2. OSI/X.25 Correspondence
Physical Layer
The physical layer transmits bits across the physical connection or modem
interface. Bay Networks supports all of the standard media for X.25 transmission:
X.21, X.21bis/RS232C, RS449/422, and V.35.
Data Link Layer
The data link layer defines the link access procedures for transferring frames of
data accurately and reliably across the access lines between the DTE and the
DCE.
Network layer
X.21, X.21bis/RS232C,
RS449/422, and V.35
LAPB
Data link layer
Physical layer
X.25 packet layer
OSI model X.25 protocol
X250003A
- Configuring X.25 1
- Services 1
- Contents 5
- 117377-A Rev. A 11
- About This Guide 15
- Before You Begin 16
- Conventions 16
- Acronyms 17
- Bay Networks Customer Service 19
- How to Get Help 20
- Chapter 1 21
- X.25 Overview 21
- X.25 and the OSI Model 22
- Physical Layer 23
- Data Link Layer 23
- Figure 1-3. LAPB Frame 24
- X.25 Service Types 25
- 1-6 117377-A Rev. A 26
- PVCs and SVCs 27
- How X.25 Services Work 27
- SVC Services 28
- 117377-A Rev. A 1-9 29
- How IPEX Works 33
- IPEX Network Interfaces 34
- X.25 PLP Interface 35
- TCP Interface 35
- IPEX Facility Support 36
- IPEX Connection Summary 38
- IPEX Mapping 38
- Q-bit Support 40
- How QLLC Works 41
- QLLC Mapping 42
- Adjacent and Partner Devices 42
- Chapter 2 45
- Implementation Notes 45
- Load Sharing 46
- Max Packet Length 47
- Flow-Control Negotiation 47
- Configuring Line Services 48
- DDN Default Service Record 49
- RFC 1356 Multiplexing 50
- 117377-A Rev. A 2-7 51
- PtoP Encapsulation 52
- X.25 over ISDN D Channel 52
- Further Information 53
- Chapter 3 55
- Enabling X.25 Service 55
- Selecting a Connector 56
- Config window (F 57
- Configuration window (F 58
- 60
- 3-8 117377-A Rev. A 62
- 3-10 117377-A Rev. A 64
- 3-12 117377-A Rev. A 66
- 67
- 3-14 117377-A Rev. A 68
- 3-16 117377-A Rev. A 70
- Chapter 4 73
- 4-2 117377-A Rev. A 74
- 80
- 4-10 117377-A Rev. A 82
- 4-12 117377-A Rev. A 84
- 4-14 117377-A Rev. A 86
- 88
- 4-18 117377-A Rev. A 90
- 92
- 93
- 4-22 117377-A Rev. A 94
- 95
- 96
- Click on Done 99
- 100
- 100
- Editing X.25 Parameters 101
- Configuring X.25 Services 102
- 4-30 117377-A Rev. A 102
- 4-32 117377-A Rev. A 104
- 106
- 108
- 110
- 110
- Deleting X.25 from the Router 111
- Chapter 5 113
- Editing LAPB Parameters 113
- 115
- 115
- 5-4 117377-A Rev. A 116
- 118
- Chapter 6 121
- Editing IPEX Parameters 121
- IPEX > Global 122
- 6-6 117377-A Rev. A 126
- 117377-A Rev. A 6-7 127
- 6-8 117377-A Rev. A 128
- 129
- 6-10 117377-A Rev. A 130
- Figure 6-8. Mapping Type Menu 130
- 131
- 6-12 117377-A Rev. A 132
- 6-14 117377-A Rev. A 134
- 6-16 117377-A Rev. A 136
- 6-18 117377-A Rev. A 138
- 6-20 117377-A Rev. A 140
- 117377-A Rev. A 6-21 141
- Deleting IPEX from the Router 142
- Chapter 7 143
- Editing QLLC Parameters 143
- 7-2 117377-A Rev. A 144
- 117377-A Rev. A 7-3 145
- Click on Add 146
- QLLC Mapping Parameters 148
- 7-10 117377-A Rev. A 152
- Appendix A 155
- Sample IPEX Configurations 155
- A-2 117377-A Rev. A 156
- Sample IPEX Configurations 157
- IPEX Single-Node Switching 158
- 117377-A Rev. A A-5 159
- Appendix B 163
- QLLC Configuration Examples 163
- Upstream QLLC Network 164
- QLLC Configuration Examples 165
- Downstream QLLC Network 166
- Endpoint QLLC Network 168
- Backbone QLLC Network 170
- Appendix C 171
- C-2 117377-A Rev. A 172
- (continued) 173
- C-4 117377-A Rev. A 174
- C-6 117377-A Rev. A 176
- Table C-6. IPEX Parameters 176
- Table C-7. QLLC Parameters 177
- Appendix D 179
- The Mapping Table follows: 180
- (continued) 181
- D-4 117377-A Rev. A 182
- D-6 117377-A Rev. A 184
- D-8 117377-A Rev. A 186
- D-10 117377-A Rev. A 188
- 117377-A Rev. A Index-1 191
- 117377-A Rev. A Index-3 193
- 117377-A Rev. A Index-5 195
- 117377-A Rev. A Index-7 197
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