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Time-slot-interchanger-and-digital-communications-terminal-for-ISDN-D-channel-assembly

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Time slot interchanger and digital communications terminal for ISDN D-channel assembly

Details

Inventors: Wille, David G.; Magleby, Kay B.;
Assignee: Alcatel USA Sourcing, L.P. (Plano, TX)
Primary Examiner: Chan; Jason
Assistant Examiner: Kwoh; Jasper
Attorney, Agent or Firm: Baker & Botts, L.L.P.

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. The frame of communication signals is stored in memory during a first frame period. During a second frame period, at least some of the stored communication signals are retrieved from memory. Multiplexed signals are assembled wherein each multiplexed signal comprises a multiplexed combination of the data bits of ISDN D-channel signals retrieved from memory. The multiplexed signals are then output during a second frame period.

DETAILED DESCRIPTION One aspect of the invention is a method and apparatus for multiplexing ISDN D-channel signals into multiplexed signals.
Another aspect of the invention is a digital communications terminal that assembles ISDN D-channel signals in accordance with the method of the invention.
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 frame of communication signals is stored in memory during a first frame period.
During a second frame period at least some of the stored communication signals are retrieved from memory.
Multiplexed signals are then assembled wherein each multiplexed signal comprises a multiplexed combination of the data bits of ISDN D-channel signals retrieved from memory.
These multiplexed signals are output during the second frame period.
In accordance with another aspect of the invention, multiplexing of ISDN D-channel signals is achieved by reading the time slot interchanger memory multiple times during a time slot period of a communications frame.
The invention has several important technical advantages.
The invention allows a digital loop carrier to meet an optional requirement of TR-303 for ISDN D-channel assembly.
Assembly may be accomplished using the time slot interchanger of the digital loop carrier.
Utilization of the time slot interchanger for D-channel assembly makes efficient use of the digital loop carrier's hardware because the time slot interchanger may also be used in its traditional time slot interchange role.
The invention allows the manufacturer of an existing digital loop carrier to easily redesign its time slot interchanger in a time and cost efficient manner in order to meet the relevant optional requirements of TR-303.
The invention achieves multiplexing of D-channel signals without adding additional frames of time delay to the D-channel signals

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