Compagnie Industrielle Des Telecommunications Cit-alcatel

Bernard Le Dieu

Jean-Rene Herledan

Georges Thiebaut

Jean-Pierre Martin

Daniel Quemere

A device for synchronizing multiplex lines in a time-division exchange comprising an input register, local and distant counters, a memory with a capacity of two frames, a frame alignment word detector, a write time select circuit, a decision circuit providing a frame skip or frame repetition facility for memory read operations, a circuit for addressing the memory in write and read modes and an odd parity injection circuit.

Device for synchronising multiplex lines in a time-division exchange

A multiplex connection unit for use in a time-division exchange comprising identical connection modules and a control interface connected to the control units of the exchange. A module comprises transcoders, synchronizing units (one per transcoder), a traffic distributor connected to the switching network, a signalling receiver and a signalling sender connected to the traffic distributor and to the control interface.

Multiplex connection unit for use in a time-division exchange

The space switch has an inlet series to parallel converter (1) arranged to take sequential data from the i-th time slot of each of a plurality of synchronized inlet multiplexes and apply them simultaneously to a parallel connection (11) within one time slot period. These time slots are written into one of two signal stores (2 and 3), e.g. sequentially. A control store (4) controls the order in which data is read from the signal store and re-assembled into outlet multiplexes by a parallel to series converter (5), thereby performing space switching between the stored time slots. The signal stores alternate between reading and writing, and each has a capacity equal to the product of the number (p) of inlet multiplexes (E1, . . . Ep) multiplied by a submultiple of the number of time slots to a frame. When the submultiple is greater than 1 there is a possibility of limited time switching within a sector of successive time slots, the number of time slots in each sector being equal to the submultiple.

Multiplex space switch

A switching network is disclosed having a time-division or space-division multiplex incoming stage and outgoing stage in which a terminal unit of the incoming stage and a terminal unit of the outgoing stage form a terminal module (ME1, ME2 . . . MEn) which can handle n multiplex links (LE1, . . . LEn). The terminal modules are formed into groups in which the traffic of a faulty module is distributed among the other terminal modules of the group and forwarded over an auxiliary incoming line (L9, L10, L11, L12) of each terminal module by an input switch (5, 6, 7, 8) associated with each terminal module. An output switch (9, 10, 11, 12) associated with each terminal module and linked to the auxiliary outgoing line (13, 14, 15, 16) of the other modules collects the distributed traffic.

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Perros Guirec, France

Bernard Le Dieu