H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/25
H04Q 11/04 (2006.01) H04Q 3/545 (2006.01)
Patent
CA 1296795
ABSTRACT OF THE DISCLOSURE A circuit for a central control TDM PCM telecommunications exchange with groups of terminals connected to a switching network is disclosed in which the terminal groups which are each connected to the duplicated switching network over TDM lines and which each include a subsidiary switching network and a decentral control unit are assigned to one another in pairs. In preparation for the stand-by substitution of the central switching network and associated central processor, in the two terminal groups, assigned to one another in pairs, the subscriber lines and/or connection lines connected to the first of said terminal groups can be switched-over from the subsidiary switching network of the first terminal group to the subsidiary switching network of the partner terminal group, whereupon the decentral control unit additionally undertakes all the control functions for the decentral control unit of the first terminal group. The decentral control units of all the first of the two terminal groups, assigned to one another in pairs, are connected over the switching network, which commences operation for the imminent stand-by connection, to the corresponding central processor by which they are loaded with all the required software. The switching operation is continued using the respective second decentral control unit until the loading procedures have been completed and the stand-by substitution of the central switching network and central processor has taken place and the temporary switch over of the subscriber lines and/or connection lines within each of the pairs of terminal groups is cancelled.
540896
Junge Uwe
Leichum Axel
Maher Anthony
Seeger Helmut
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
Junge Uwe
Leichum Axel
Maher Anthony
LandOfFree
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