H - Electricity – 04 – M
Patent
H - Electricity
04
M
344/13
H04M 3/42 (2006.01) H04M 3/487 (2006.01) H04Q 3/00 (2006.01)
Patent
CA 1184637
ABSTRACT OF THE DISCLOSURE A subscriber station functioning as a concentrator is connected to subscribers and is connected via trunk lines to a centrally placed transit exchange establishing connections, by reason of a given command, between a source sending special information and a trunk line pointed out as being idle. The subscriber station includes a trunk line economizing apparatus investigating each time a subscriber calls the source whether one of the trunk lines is already connected to the source. If no such connection is determined, the source and the calling subscriber are conven- tionally connected to a trunk line indicated as being idle, the number of this line being intermediately stored in a memory unit associated with the economizing apparatus. If it is de- termined on investigation that the special information is already being transferred to the subscriber station, the sub- scriber calling the source is connected to the trunk line whose number is intermediately stored in the memory unit. The economizing apparatus includes a circuit for cancelling the intermediate storage when the special information is no longer received by any of the subscribers. Independent of the number of subscribers receiving the special information, only a single trunk line is taken into use, and the central transit exchange is only loaded with a single connection establishment.
392351
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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