Legacy SNA (2)
SNA physical entities
- Hosts: example S/370 mainframe
- Communication Controllers : example FEP 3745 (front-end processor)
- Establishment Controllers: example 3174 (called cluster controller)
- Terminals: example 3270
SNA network addressable units
- Logical Units (LUs) - function as end-user port into SNA router
- Physical Units (PUs)- monitors and control network links (implemented on hosts VTAM)
- Control Points (CPs) - manage SNA nodes and resources
SNA nodes
- Sub-area Nodes Type 4 and 5 - provide services (Hosts and Communication Controllers)
- Peripheral Nodes Type 1 and 2 - Establishment Controllers and Terminals