Alcatel Cit

Herve Roux

Jean-Claude Faye

Jacques Guinand

Jean-Loup Ferrant

A switching element for cross-connect equipment for digital bit streams multiplexed by time-division multiplexing of digital bit streams at different bit rates includes, for each incoming frame transmission medium, a device for extracting from said incoming frames signals constituting multiplexing units to be cross-connected. It further includes for each incoming frame transmission medium a memory for signals constituting multiplexing units to be cross-connected adapted to hold at least N signals where N denotes the repetition period in the incoming frames of the lowest bit rate tributary of the multiplexing hierarchy. It further includes for each incoming frame transmission medium for a device for writing said memory synchronously with the extraction of said signals, at different addresses for signals constituting different multiplexing units to be cross-connected and at the same addresses for signals constituting the same multiplexing unit to be cross-connected, the frequency at which each address is rewritten being related to the repetition period in the incoming frames of the signals written at said address. It finally includes for each incoming frame transmission medium a device for reading said memory synchronously with the insertion into the outgoing frames of signals constituting multiplexing units to be cross-connected at addresses determined by said distribution law.

Switching element for cross-connect equipment for digital bit streams

A frame restructuring interface for digital bit streams multiplexed by time-division multiplexing digital tributaries at different bit rates according to a synchronous multiplexing hierarchy at the various levels of which tributaries are constituted entities called containers and entities called multiplexing units. The interface includes a circuit for extracting from incoming frames the signals constituting the containers to be processed, and a circuit for constituting and for multiplexing into restructured frames subdivided into sections of the same length restructured multiplexing units, by inserting the signals together with indexing and justification signals for adapting their extraction and insertion timing rates at locations which for a given container to be processed have within each restructured frame section ranks defined relative to the start of the section, the ranks being invariant from one frame section to another and from one frame to another, and each set of the ranked locations of the restructured frame sections being assigned to at most one restructured multiplexing unit.

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Massy, France

Herve Roux