US Patent No: 8,184,587

Number of patents in Portfolio can not be more than 2000

System and method for measuring round trip delay of voice packets in a telephone system




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Systems and methods measure a round trip delay of voice packets through a telephone system that includes a plurality of cabinets connected through a network. Each cabinet includes a link for communicating with other cabinets through the network by passing information such as voice packets. Each link includes a field programmable gate array (FPGA) that inserts and reads information in the voice packets to measure a time delay of the network. A first cabinet link sets a transmit bit in a voice packet directed to a second cabinet and starts a timer. The second cabinet monitors the transmit bit in received voice packets to determine if the bit is set. If so, the second cabinet sets a receive bit in the next outgoing voice packet directed to the first cabinet. The first cabinet monitors the receive bit in incoming voice packets and if set, stops the timer. The resulting value in the timer reflects the network delay.

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Patent Owner(s)

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International Classification(s)

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Inventor Name Address # of filed Patents Total Citations
Collins, Thornton L Stirling, CA 2 13
Cyr, Andre M Belleville, CA 4 26
McPherson, Ian B Belleville, CA 2 13

Cited Art Landscape

Patent Info (Count) # Cites Year
* 6,697,331 Link layer acknowledgement and retransmission for cellular telecommunications 71 1999
* 5,875,183 Mobile communication system 76 1996
Alcatel Data Networks Inc. (1)
* 5,633,861 Traffic management and congestion control for packet-based networks 155 1996
* 6,320,867 Method and apparatus for hierarchical management of subscriber link traffic on digital networks 36 1998
Bell Telephone Laboratories, Incorporated (2)
* 4,569,042 Time measurements in a transmission path 93 1983
* 4,630,259 Lockup detection and recovery in a packet switching network 45 1984
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
Burroughs Wellcome Co. (1)
5,225,431 Therapeutic substituted indole compounds and compositions thereof 7 1991
* Cited By Examiner

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