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
Stats
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May 22, 2012
Issued date -
Mar 25, 2004
filing date -
10/808,724
serial no -
In Force
status
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Abstract
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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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,569,042 Time measurements in a transmission path | 75 | 1983 | |
| 4,630,259 Lockup detection and recovery in a packet switching network | 44 | 1984 | |
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| 5,633,861 Traffic management and congestion control for packet-based networks | 126 | 1996 | |
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| 4,322,793 Communication controller transparently integrated into a host CPU | 21 | 1979 | |
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| 5,875,183 Mobile communication system | 63 | 1996 | |
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| 6,697,331 Link layer acknowledgement and retransmission for cellular telecommunications | 44 | 1999 | |
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| 6,320,867 Method and apparatus for hierarchical management of subscriber link traffic on digital networks | 32 | 1998 | |
Patent Citation Ranking
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