Telegraphy – Systems – Printing
Patent
1977-10-27
1979-03-13
Robinson, Thomas A.
Telegraphy
Systems
Printing
179 15BA, 179 18ES, H04J 306, H04Q 354
Patent
active
041444078
ABSTRACT:
A new, high capacity switching center for telegraphic lines which employs digital elements is herewith described. The system resembles a multiprocessor with hierarchical organization. The general coordinating functions of the system are carried out by a minicomputer having a main memory and a mass memory. Several high speed microcomputers (known as the multiplex subsystem or multiplexer), each having in turn a local working memory, are interconnected to each other and to the minicomputer through a multiplex channel. Telegraphic lines are connected to each microcomputer. These in turn are linked to users in remote locations. The local memories of the microcomputers include an area reserved for the recording of incoming messages from the connected users and an area for recording the outgoing messages to the connected users. The messages received from one of the various microcomputers are sent to the microcomputer linked with the recipient user by employing the time division multiplex technique (TDM). A preselected microcomputer operates as interface between the multiplex subsystems and the minicomputer. All the components of the system (minicomputer and related peripheral units, the interface microcomputer, multiplex subsystem microcomputers, local working memories and communication channels) are duplicated for fail safe reasons. In other words, if any of the switching center components fails, a back up component is automatically substituted thus guaranteeing operational continuity and no loss of messages during the transfer phase.
REFERENCES:
patent: RE29215 (1977-05-01), Carney et al.
patent: 3974343 (1976-08-01), Cheney et al.
patent: 4074072 (1978-02-01), Christensen et al.
Casalino Carlo
Zaffignani Giovanni
Ing. C. Olivetti & C. S.p.A.
Robinson Thomas A.
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