Multiplex communications – Wide area network – Packet switching
Patent
1987-07-02
1990-02-27
Brown, Thomas W.
Multiplex communications
Wide area network
Packet switching
379269, 379279, H04M 308, H04Q 1104
Patent
active
049052209
ABSTRACT:
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.
REFERENCES:
patent: 4059736 (1977-11-01), Perucca et al.
patent: 4144407 (1979-03-01), Zaffignani et al.
patent: 4543651 (1985-09-01), Chang
Telcom Report (Siemens, Munich), vol. 4, (1981), Special Issue "FWSD Digital Switching System" pp. 3-67.
Junge Uwe
Leichum Axel
Maher Anthony
Seeger Helmut
Brown Thomas W.
Morris Jeffrey P.
Siemens Aktiengesellschaft
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