Transposed multi-channel switching

H - Electricity – 04 – Q

Patent

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H04Q 11/04 (2006.01)

Patent

CA 2025969

ABSTRACT A synchronous time division multiplexing system for multi-channel calls involves dividing each frame into a first segment and a second segment each containing substantially the same number of time slots and dividing the number of channels of the multi-channel call into a first subset and a second subset each containing approximately the same number of channels. Thereafter, the first subset is assigned to the first segment of the first frame and the second subset to the second segment of the first frame. The invention involves in a first time switching stage transposing the first subset to the second segment of the first frame such that the channels within the first subset occupy eligible free slots and retain their relative order and transposing the second subset to the first segment of the next frame such that the channels within the second subset occupy eligible free slots and retain their relative order. The call subsets are thus transposed during a single stage of time switching. By assigning the selected slots in each segment in an ascending order, the output samples of a call will appear in the proper order but will not be properly positioned in the frame. When the transposed subsets are likewise switched in a second time-switching stage, the call samples will be positioned properly in the frame. Thus, traversing an even number of time switches, from source to termination, guarantees both frame consistency and the desirable slot order.

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