Saturday, August 29, 2009

IBM implementation

In this picture we see an IBM implementation of Token Ring. An IBM mainframe 3090
cannot directly communicate with the Token Ring. To do that it needs an NCP which is a
dedicated computer that only handles the communication between the mainframe and the
Token Ring network.

The users sitting on terminals can access the data from the mainframe through a terminal
server. There can be several thousand terminals connected to a mainframe.

Another possibility is to use mini computers such as AS/400. These mini computers can be
accessed by directly connected terminals as in the picture, or from a terminal server.

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