SNA Terms and Concepts
Basic SNA Concepts
A type 4 or 5 subarea node to which a peripheral node is attached acts as a boundary node. It performs a boundary function by translating between the network addresses used by a subarea node and the local addresses used by a peripheral node.
A simple subarea network includes the following components:
Host
A host is a mainframe computer compatible with the original IBM System/370. A host is a type 5 node.
Communication controller
A communication controller, also known as a
Communications link
A communications link connects the host site with an
Terminal controller
At the remote end of the communications link is a terminal controller, also known as a cluster controller. It is responsible for controlling the use of the link, and routes data to the terminals. The most
Terminals
Users run host applications or submit work to the host from terminals. The
Printers
Printers such as the IBM 3287 can also be attached to the terminal controller. They can receive output from the host.
As shown in Figure
28 | Chapter 1 |