Digital transmission system

H - Electricity – 04 – K

Patent

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340/70

H04K 1/00 (2006.01) H04B 17/02 (2006.01) H04L 9/00 (2006.01) H04L 25/03 (2006.01)

Patent

CA 1126361

ABSTRACT: In a digital transmission system of the type in which a bit stream is divided into consecutive transmission frames and in which extra bits are inserted in given bit position of each transmission frame the bit stream is scrambled in a transmitter terminal station and transmitted via a plurality of regenerative repeaters to a receiver terminal station, in which the transmitted bit stream is descrambled and the inserted extra bits are selected from the bit stream. Both the scrambler and the descrambler comprise a generator for generating a given fixed scramble pulse pattern. In addition, both the transmitter and the receiver terminal station comprise a transmission clock pulse counter which, on attaining its final counting position, supplies a setting pulse which adjusts the pulse pattern generators in the scrambler and the descrambler to an initial generation state, By chosing a fixed relation between this final counting position and the number of bit positions per transmission frame it is possible to select with simple means the extra bits, inserted in the consecutive transmission frames, in the repeaters and the receiver terminal station without the necessity of first descrambling the received scrambled bit stream. -27-

311765

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