Pulse or digital communications – Repeaters – Testing
Patent
1996-06-06
1999-05-11
Lim, Krisna
Pulse or digital communications
Repeaters
Testing
375370, 375220, H04L25/40
Patent
active
059037750
ABSTRACT:
A method is provided for allowing the transmission of digital video segments along a number of transmission channels, with the line speed, or rate of transmission in bits per second, being variable during a transmission. For each transmission channel, video data segments are stored in a data buffer, along with data segments known as Write Control Blocks (WCBs). Each WCB includes a pointer to the video data segment with which it is associated and a line speed code indicating the preferred rate of data transmission. The addresses of the WCBs are stored in a FIFO buffer which is established for each transmission channel. When coded information within a WCB indicates that a speed change is needed, a run-time subroutine executing in a co-processor sets bits within a channel control word forming a portion of each WCB to stop a DMA process and to issue an interrupt when the corresponding video segment is to be transmitted. An interrupt handler determines the new line speed and sets a variable speed clock accordingly.
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Davidge R. V.
International Business Machines - Corporation
Lim Krisna
Tomlin R. A.
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