Time slot interchanger and digital communications terminal for I

Multiplex communications – Pathfinding or routing – Through a circuit switch

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370412, 370474, 370524, H04J 300

Patent

active

060026855

ABSTRACT:
The invention comprises a time slot interchanger and method for multiplexing ISDN D-channel signals into multiplexed signals in a digital communications terminal. The method comprises receiving a frame of communication signals wherein some of the communication signals represent ISDN D-channel signals wherein each ISDN D-channel signal is represented by a first number of data bits and a second number of other bits. A first copy of the frame of communication signals is stored in a first memory while a second copy of the frame of communication signals is stored in a second memory during a first frame period. During a second frame period, at least some of the stored communication signals are retrieved from the first memory and at least some of the stored communication signals are retrieved from the second memory. Multiplexed signals are then assembled wherein at least one multiplexed signal comprises a multiplexed combination of the data bits of ISDN D-channel signals retrieved from the first and second memories.

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M.J.M. Forbes et al. Integrated Access: The Achievement of a Vision, IEEE 2081-2086, 1991.
Arvidson et al, A Generic Digital Switch Interface (TR-303) For Local Access, IEEE 2087-2091, 1991.
Kim et al, Flexibilty and Quality in the Access Network, IEEE 1864-1868, 1992.
Bellcore Information, Bellcore: GR-303 Integrated Access Platforms, Mar. 3, 1998.

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