- Tech know how online

terminal network

A terminal network is a centrally controlled network. It consists of a central computer, the mainframe, the front-end processor and the cluster controllers, the terminals connected in a star configuration, and the transmission-related components connecting them, such as transmission equipment, switches, networks, etc.

The IBM philosophy in the early years was to collect the input data from several "dumb" terminals in a cluster controller and send it on a more or less long line to a mainframe. The mainframe was preceded by another computer that took care of collecting the data and later distributing the work results, the front-end processor( FEP). The classic SNA architecture with IBM 3270 had a transmission speed of 2.35 Mbps. In the 3270 terminal network, the terminals are connected to the cluster controllers in a star configuration via coaxial cables. The coaxial cable used is RG-62 cable with an impedance of 93 ohms. The maximum connection length between terminal and Cluster Controller is up to 1,500 m.

Terminal network with mainframe, FEP and Cluster Controller

Terminal network with mainframe, FEP and Cluster Controller

A terminal network is not a real data network by design, since there was no direct communication between the domains. If there were any connections to neighboring domains at all, it was at the front-end processor level.

Englisch: terminal network
Updated at: 04.05.2013
#Words: 200
Links: terminal, network, computer, mainframe, processor
Translations: DE

All rights reserved DATACOM Buchverlag GmbH © 2023