Expected value data framer and method
First Claim
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1. A data communications framing method comprising the steps:
- anticipating particular variable data bits to be sent in a desired packet of data;
framing the desired packet of data in a received signal by detecting the anticipated data bits in predetermined bit positions therein;
producing a first logic signal in response to detection of the anticipated pattern of data bits in predetermined bit positions;
detecting in the received signal a known pattern of flag bits that typically precede a data packet in predetermined bit positions, and producing a second logic signal in response thereto;
detecting in the received signal a known pattern of flag bits that typically follow a data packet in predetermined bit positions, and producing a third logic signal in response thereto; and
producing a signal indicative of proper framing by logically ORing the first, second and third signals together.
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Abstract
A framer for a data receiver operates by anticipating particular variable data bits to be sent in a desired group of data, and framing the desired group of data in a received signal by detecting the anticipated data bits in predetermined bit positions therein. The invention is illustrated with reference to a packet-based paging system.
15 Citations
2 Claims
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1. A data communications framing method comprising the steps:
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anticipating particular variable data bits to be sent in a desired packet of data; framing the desired packet of data in a received signal by detecting the anticipated data bits in predetermined bit positions therein; producing a first logic signal in response to detection of the anticipated pattern of data bits in predetermined bit positions; detecting in the received signal a known pattern of flag bits that typically precede a data packet in predetermined bit positions, and producing a second logic signal in response thereto; detecting in the received signal a known pattern of flag bits that typically follow a data packet in predetermined bit positions, and producing a third logic signal in response thereto; and producing a signal indicative of proper framing by logically ORing the first, second and third signals together.
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2. A data communications framing method comprising the steps:
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anticipating particular variable data bits to be sent in a desired packet of data; framing the desired packet of data in a received signal by detecting the anticipated data bits in predetermined bit positions therein; producing a first logic signal in response to detection of the anticipated pattern of data bits in predetermined bit positions; detecting in the received signal a known pattern of flag bits that typically precede a data packet in predetermined bit positions, and producing a second logic signal in response thereto; detecting in the received signal a known pattern of flag bits that typically follow a data packet in predetermined bit positions, and producing a third logic signal in response thereto; and producing a signal indicative of proper framing in response to any two of the first, second and third logic signals.
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Specification
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Current AssigneeProtocol-ip.com, LLC, Seiko Instruments Incorporated (Seiko Group)
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Original AssigneeSeiko Corporation (Seiko Group), Seiko Epson Corporation (Seiko Group)
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InventorsShaver, Christopher J.
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Primary Examiner(s)Olms, Douglas W.
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Assistant Examiner(s)Kizou, Hassan
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Application NumberUS07/589,115Time in Patent Office1,735 DaysField of Search370/94.1, 370/94.2, 370/60, 370/60.1, 370/99, 370/105.1, 370/105.4, 370/106, 340/825.44, 455/33, 455/54, 375/116, 375/114US Class Current370/474CPC Class CodesH04L 7/041 using special codes as sync...H04L 7/042 Detectors therefor, e.g. co...
