SNA Link/iX Node Managers Guide (30291-90009)
Table Of Contents
- 1 SNA Links Overview
- 2 SNA Node and Link Configuration
- 3 Logging Configuration
- 4 SNA Node Startup and Shutdown
- 5 SNA Link Troubleshooting
- 6 MPE Commands
- 7 SNA Link Installation Information
- A Messages
- SDLC Link Startup Error Messages
- SDLC Link Driver Error Messages
- SNACONTROL Error Messages
- SNA Transport Error Messages
- SNA Transport Logging Messages
- SDLC Link Shutdown Error Messages
- X.25 Link Failure Error Codes
- X.25 Link Module Configurator Error Codes
- X.25 Link QLLC Internal Error Codes
- NetView Alerts Error Messages
- Network Dump Manager Error Messages
- LAN Error Messages
- B Netview Alerts
22 Chapter1
SNA Links Overview
SNA/X.25 Link Overview
SNA/X.25 Link Overview
SNA/X.25 Link is composed of only software:
• SNA Transport
• Qualified Logical Link Control (QLLC) module
SNA/X.25 Link communicates with the X.25 network through the X.25
System Access software on the HP 3000, which is supported by a
Datacommunications and Terminal Controller (DTC). The QLLC
module enforces the QLLC protocol, which is a special protocol
developed by IBM to resolve differences between SDLC and X.25. It
uses qualified X.25 packets to send link control messages in a format
similar to SDLC link control messages.
Figure 1-3 shows how SNA/X.25 Link, the SNA services, and the
required NS products implement HP 3000-to-IBM host communication.
Figure 1-3 SNA/X.25 Link HP-to-IBM Host Communication
Figure 1-4 shows how SNA/X.25 Link, the SNA services, and the
required NS products implement HP 3000-to-IBM AS/400
communication.