Introduction to Tandem X.25 Capabilities

Contents
vi 065307 Tandem Computers Incorporated
Figures Figure 1-1. Proprietary Networking Conventions 1-2
Figure 1-2. X.25 Connection 1-3
Figure 1-3. Comparison of X.25, OSI, and SNA 1-5
Figure 1-4. Placement and Functions of a PAD 1-7
Figure 1-5. PAD-Related Standards 1-8
Figure 1-6. Standards for Connecting Networks 1-9
Figure 1-7. X.121 Address Format 1-10
Figure 1-8. X.25 Layers 1-12
Figure 1-9. Packaging Data for Transmission 1-13
Figure 1-10. Logical Channel Assignments 1-15
Figure 1-11. Packet Header Structure 1-16
Figure 1-12. CUD in Call Setup Packets 1-18
Figure 1-13. Call Setup Packets 1-19
Figure 1-14. Call Clear Packets 1-20
Figure 1-15. Data Packets 1-21
Figure 1-16. Window Rotation of Data Packets 1-22
Figure 1-17. LAPB Station Configuration 1-25
Figure 1-18. X25 Frame Format 1-26
Figure 1-19. Frame Addressing 1-28
Figure 1-20. Data Transfer of Information Frames 1-29
Figure 1-21. REJ Frame Transmission 1-32
Figure 1-22. FRMR Frame Transmission 1-34
Figure 2-1. X25AM Subsystem Components 2-3
Figure 2-2. Subaddressing 2-5
Figure 2-3. Transit Delay Indication 2-10
Figure 2-4. User Application and X25AM Connectivity 2-13
Figure 2-5. Local Asynchronous Terminal Connection through
X3PAD 2-14
Figure 2-6. Remote Asynchronous Terminal 2-15
Figure 2-7. Connecting to a PAD without a PSDN 2-17
Figure 2-8. Connecting to a LAN through UB Access/One 2-18
Figure 2-9. Connecting to other Host Computer Systems 2-19
Figure 2-10. Connecting Multiple Tandem Systems through a PSDN 2-21
Figure 2-11. Connecting to InfoWay via SysWay and X25AM 2-22