US 4,901,347 AGranted

Circuit arrangement for telecommunication switching systems, particularly PCM-time-division multiplex telephone switching systems with a central matrix and with local sub-switching matrices connected to the same

AssigneeSiemens Aktiengesellschaft

InventorsLothar Schmidt, Klaus Eberlein, Gerhard Schaich, Fritz Hlawa

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Abstract

A circuit arrangement for telecommunication switching systems, including PCM time division multiplex telephone switching systems, with double central switching matrix by which two corresponding line trunk groups comprising a sub-switching matrix each and a group control unit each, are allocated to each other in pairs via two time-division-multiplex lines. The line units and the PCM-lines leading to the central switching matrix, which are individually respectively allocated to the two line trunk groups, and which are connected with the respective sub-switching matrix of their own line trunk group during normal service, are switchable, during emergency service of one of the two line trunk groups, to the sub-switching matrix of the respective other line trunk group. In order that no calls already interconnected via the line units of the affected line trunk group up to the time of the switch-over are interrupted, each local control unit transmits all call data of interconnected calls to its associated control unit while still in normal service, on which basis the appertaining calls are securely interconnected within the sub-switching matrix of the associated line trunk group.

Claims12

Dependent claims

A circuit arrangement for centrally controlled telecommunication switching systems, including PCM-telephone switching systems wherein a central switching matrix serving for the interconnection, together with a program controlled central processor serving, at least, for its control and the required switch identifier processing, and wherein a multiplicity of local trunk line groups, each group with a sub-switching matrix for the connection of external trunk and/or subscriber lines, and equipped with a local programmable control unit for the reception of switch identifiers from said lines, for switch identifier pre-processing as well as for forwarding switch identifiers to the central processor and for the transmission of switch identifiers on said lines is provided, and wherein sub-switching matrices within these trunk line groups are internally connected via groups of link lines, separated in groups, with switching terminations of the central switching matrix, and wherein the line trunk groups are allocated to each other in pairs, wherein line units, primarily connected to their sub-switching matrix and within the respective line trunk group serving for the external connection of subscriber and/or trunk lines, are switchable in a manner wherein the line units of respectively a first of these two line trunk groups is additionally switched to the sub-switching matrix of the respective other, of a respective second line trunk group, whereupon the corresponding switch identifier processing as well as the sub-switching matrix setting for the calls to be interconnected via the switched-over line units is likewise executed by the local control unit of the other, second line trunk group, characterized in that, in preparation for a switch-over within each of said pairs of line trunk groups allocated to each other in pairs, each of the two appertaining local control units provide call data, relative to all existing calls via the respective allocated sub-switching matrix, regarding which external sub-switching matrix circuit is respectively connected with which internal sub-switching matrix circuit, which are transmitted via respective local transmission paths of the line trunk pairs to the respective corresponding associated control units, and that each of the local control units establishes individual partial connections in conjunction with said call data transmitted to and received by them via the sub-switching matrix of the appertaining allocated line trunk group respectively between internal sub-switching matrix circuits and external sub-switching matrix circuits, wherein such external sub-switching matrix circuits with which the line circuits of the respective associated line trunk groups are connectable through a switch-over on the one hand and such internal sub-switching matrix circuits with which the line units of the respective associated line trunk group are connectable through said switch-over, on the other hand.

A circuit arrangement for centrally controlled telecommunicating switching systems, including PCM-telephone switching systems wherein a central switching matrix serving for the interconnection, together with a program controlled central processor serving, at least, for its control and the required switch identifier processing, and wherein a multiplicity of local trunk line groups, each group with a sub-switching matrix for the connection of external trunk and/or subscriber lines, and equipped with a local programmable control unit for the reception of switch identifiers from said lines, for switch identifier pre-processing as well as for forwarding switch identifiers to the central processor and for the transmission of switch identifiers on said lines is provided, and wherein, in said trunk line groups sub-switching matrices are internally coupled to switching terminations of the central switching matrix by way of groups of link lines separated into groups;

wherein the trunk lines are respectively allocated to each other in pairs, and wherein within each of the same, termination units, being any of subscriber line circuits, multiple subscriber line circuits, trunk line termination circuits, trunk line multiple termination circuits, serving for the external connection of subscriber and/or trunk lines and primarily coupled to their respective switching matrix, are switchable in a manner such that the line units of respectively a first of these two line trunk groups is additionally switched to the sub-switching matrix of the respective other, of a respective second line trunk group, whereupon the corresponding switch identifier processing as well as the sub-switching matrix setting for the calls to be interconnected via the switched-over line units is likewise executed by the local control unit of the other, second line trunk group, characterized in that, in preparation for a switch-over within each of said pairs of line trunk groups allocated to each other in pairs, each of the two appertaining local control units provide call data, relative to all existing calls via the respective allocated sub-switching matrix, regarding which external sub-switching matrix circuit is respectively connected with which internal sub-switching matrix circuit, which are transmitted via respective local transmission paths of the line trunk pairs to the respective corresponding associated control units, and that each of the local control units establishes individual partial connections in conjunction with said call data transmitted to and received by said control units via the sub-switching matrix of the appertaining allocated line trunk group respectively between internal sub-switching matrix circuits and external sub-switching matrix circuits, wherein such external sub-switching matrix circuits with which the line circuits of the respective associated line trunk groups are connectable through a switch-over on the one hand and such internal sub-switching matrix circuits with which the line units of the respective associated line trunk group are connectable through said switch-over, on the other hand.

A circuit arrangement for centrally controlled telecommunicating switching systems, particularly PCM-telephone switching systems in which a central switching matrix serving for the interconnection, together with a program controlled central processor serving, at least, for its control and the required switch identifier processing, and wherein a multiplicity of local trunk line groups, each with a sub-switching matrix for the connection of external trunk and/or subscriber lines, and equipped with a local programmable control unit for the reception of switch identifiers from said lines, for switch identifier pre-processing as well as for forwarding switch identifiers to the central processor and for the transmission of switch identifiers on said lines is provided, and wherein, in said trunk line groups sub-switching matrices are internally coupled to switching terminations of the central switching matrix by way of groups of link lines separated into groups;

wherein the trunk lines are respectively allocated to each other in pairs, and wherein termination units serving for the external connection of subscriber and/or trunk lines and primarily coupled to their respective switching matrix, are switchable in a manner such that the line units of respectively a first of these two line trunk groups is additionally switched to the sub-switching matrix of the respective other, of a respective second line trunk group, whereupon the corresponding switch identifier processing as well as the sub-switching matrix setting for the calls to be interconnected via the switched-over line units is likewise executed by the local control unit of the other, second line trunk group, characterized in that, in preparation for a switch-over within each of said pairs of line trunk groups allocated to each other in pairs, each of the two appertaining local control units provide call data, relative to all existing calls via the respective allocated sub-switching matrix, regarding which external sub-switching matrix circuit is respectively connected with which internal sub-switching matrix circuit, which are transmitted via respective local transmission paths of the line trunk pairs to the respective corresponding associated control units, and that each of the local control units establishes individual partial connections in conjunction with said call data transmitted to and received by said local control units via the sub-switching matrix of the appertaining allocated line trunk group respectively between internal sub-switching matrix circuits and external sub-switching matrix circuits, wherein such external sub-switching matrix circuits with which the line circuits of the respective associated line trunk groups are connectable through a switch-over on the one hand and such internal sub-switching matrix circuits with which the line units of the respective associated line trunk group are connectable through this switch-over, on the other hand.

Dependencies are inferred from the claim text.