Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2005-06-28
2005-06-28
Ho, Duc (Department: 2665)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S465000, C710S023000, C709S212000
Reexamination Certificate
active
06912217
ABSTRACT:
A system and method are presented for the encapsulation of a protocol stack in a voice telephony processor. Utilizing the system and method disclosed herein, digital voice telephony signals received in TDM frame-based format are converted to packet-based or cell-based format for transmission on a network, and vice-versa. The system and method may be embodied as a functional block within a specialized high-density integrated circuit voice processor. The voice processor employs on-chip digital signal processors (DSPs) to perform echo cancellation, dynamic range compression/expansion, and other processing on voice data. Advantageously, the encapsulation process of the disclosed herein does not impact the throughput of the DSPs. Instead, voice data is reformatted and prefixed with a header for the appropriate protocol layers using a dedicated on-chip packet control processor and linked list data structures managed by indexed direct memory access (DMA) controllers. Thus, data encapsulation has no impact on the signal processing activities.
REFERENCES:
patent: 5502838 (1996-03-01), Kikinis
patent: 5970069 (1999-10-01), Kumar et al.
patent: 6092116 (2000-07-01), Earnest et al.
patent: 6622183 (2003-09-01), Holm
Conley Rose & Tayon
Ho Duc
LSI Logic Corporation
Nguyen Phuongchau Ba
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