Telegraphy – Systems – Automatic
Patent
1979-11-06
1981-09-22
Robinson, Thomas A.
Telegraphy
Systems
Automatic
179 18ES, H04L 1100, H04Q 354
Patent
active
042911966
ABSTRACT:
A circuit for the systematic handling of conversation data from a calling party to a called party for use in a distributed processing telex exchange is disclosed. The customer terminations connected to the exchange are divided into a predetermined number of groups of terminations having a predetermined number of terminations in each group. Associated with each group of terminations is a frame memory which has memory capacity for storing a single bit of conversation data from every termination connected to the exchange. Associated with each frame memory is a vector memory which has a memory location associated with each termination in a group. Each vector memory location contains a frame memory address that addresses the location in frame memory containing the conversation data to be forwarded down to the termination associated with the current vector memory address. In addition, each vector memory location contains an active bit which is included with the conversation data forwarded to the called party termination to indicate that a call is in progress for that termination.
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"Introducing ELTEX", undated brochure of Frederick Electronics Corp.
General System Manual, "ELTEX Telex Exchange", Nov. 1979, Frederick Electronics Corp.
ELTEX Technical Information, Apr. 1978, Frederick Electronics Corp.
ELTEX Technical Information, Revision I, Apr. 1979, Frederick Electronics Corp.
Bowerman John J.
Perlman Marvin
Spaniol John W.
Frederick Electronics Corp.
Robinson Thomas A.
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