Timing source
First Claim
Patent Images
1. A timing source for sending timing information via a packet network, said source comprising:
- a first clock for generating said timing information;
a packet forming section for forming a sequence of packets;
an output section for transmitting said packets of said sequence via said network as packet bursts, each of which comprises a plurality of said packets with a time difference between consecutive packets of a same burst being less than a time difference between consecutive bursts, and said time difference between packets in the same burst being greater than a length of said packet, so that individual delays in transit times of at least some packets of the sequence are arranged to be minimized and to be consistent with each other across the network; and
a time-stamping section for inserting into each said packet of said sequence a transmission time derived from said timing information generated by said first clock.
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Abstract
A timing source is provided for sending timing information via a packet network. The source comprises a first clock for generating the timing information and a packet forming section for forming a sequence of packets. An output section in the form of a packet launch control section transmits the packets via the network as packet bursts, each of which comprises a plurality of packets with the intervals between consecutive packets of each burst being less than the intervals between consecutive packets. A time-stamping section inserts into each packet a transmission time derived from the timing information generated by the clock.
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Citations
25 Claims
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1. A timing source for sending timing information via a packet network, said source comprising:
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a first clock for generating said timing information; a packet forming section for forming a sequence of packets; an output section for transmitting said packets of said sequence via said network as packet bursts, each of which comprises a plurality of said packets with a time difference between consecutive packets of a same burst being less than a time difference between consecutive bursts, and said time difference between packets in the same burst being greater than a length of said packet, so that individual delays in transit times of at least some packets of the sequence are arranged to be minimized and to be consistent with each other across the network; and a time-stamping section for inserting into each said packet of said sequence a transmission time derived from said timing information generated by said first clock. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A combination of:
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a timing source for sending timing information via a packet network, said source comprising a first clock for generating said timing information, a packet forming section for forming a sequence of packets, an output section for transmitting said packets of said sequence via said network as packet bursts, each of which comprises a plurality of said packets with a time difference between consecutive packets of a same burst being less than a time difference between consecutive bursts, and said time difference between packets in the same burst being greater than a length of said packet, so that individual delays in transit times of at least some packets of the sequence are arranged to be minimized and to be consistent with each other across the network, and a time-stamping section for inserting into each said packet of said sequence a transmission time derived from said timing information generated by said first clock; and a destination apparatus comprising a second adjustable clock and an arrangement for adjusting said second clock into synchronism with said first clock. - View Dependent Claims (23, 24)
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25. A method of sending timing information via a packet network, said method comprising the steps of:
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generating said timing information;
forming a sequence of packets;transmitting said packets of said sequence via said network as packet bursts, each of which comprises a plurality of said packets with a time difference between consecutive packets of a same burst being less than a time difference between consecutive bursts and said time difference between packets in the same burst being greater than a length of said packet, so that individual delays in transit times of at least some packets of the sequence are arranged to be minimized and to be consistent with each other across the network; and inserting into each said packet of said sequence a transmission time derived from said timing information.
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Specification