US4910754A
Expired / Lapsed
US
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Initialization and synchronization method for a two-way communication link
Assignee: EMC Corp
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Filing: 1988-09-30
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Granted: 1990-03-20
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Expires: 2008-09-30
Abstract
Abstract An initialization or synchronization method in which at least a predetermined number of synchronization messages are sent out over a two-way communication line. The receipt of a synchronization message is awaited before terminating the transmission of synchronization message. After the transmission of synchronization messages has been terminated the receipt of a non-synchronization message will complete the synchronization process. However, certain conditions may cause synchronization to be restarted such as a predetermined number of consecutive error messages, failure to receive any message in a predetermined number of clock signals, receiving more than a predetermined number of synchronization signals, or a reset command.
Inventors
- 👤 John D. Allen
- 👤 Jeffrey V. Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:19
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0602; H04L; H04L7/00; H04L7/04; H04L7/10; H04L7/041; H04L2007/045; H04L7/048
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
108 words
A method for initializing a communication link between a first and a second interface comprising the steps of: comparing, at said first interface, incoming signals from said second interface with a synchronization signal; transmitting at least a first predetermined number of synchronization signals from said first interface; detecting an incoming synchronization signal when an incoming signal is identical to said synchronization signal; terminating the transmission of synchronization signals from said first interface after both an incoming synchronization signal has been detected and said first predetermined number of synchronization signals has been transmitted; and generating an available signal at regular intervals following the detection of an incoming synchronization signal.
Claim 2
Independent Claim
108 words
A method for initializing a communication link between a first and a second interface comprising the steps of: comparing, at said first interface, incoming signals from said second interface with a synchronization signal; transmitting at least a first predetermined number of synchronization signals from said first interface; detecting an incoming synchronization signal when an incoming signal is identical to said synchronization signal; terminating the transmission of synchronization signals from said first interface after both an incoming synchronization signal has been detected and said first predetermined number of synchronization signals has been transmitted; and generating an available signal at regular intervals following the detection of an incoming synchronization signal.
Claim 3
Dependent Claim
33 words
The initialization method of claim 1 further comprising the step of checking for errors in incoming signals and wherein said step of detecting requires that an incoming synchronization signal be received without errors.
Claim 4
Dependent Claim
25 words
The initialization method of claim 2 further comprising the step of repeating the initialization method if three consecutive signals are received each containing an error.
Claim 5
Dependent Claim
46 words
The initialization method of claim 1 further comprising the step of counting synchronization signals as they are received and repeating said initialization method if the number of synchronization signals received exceeds a second predetermined number, said second predetermined number being larger than said first predetermined number.
Claim 6
Dependent Claim
29 words
The initialization method of claim 1 further comprising the step of continually transmitting signals over said communication link at regular intervals after terminating the transmission of said synchronization signals.
Claim 7
Dependent Claim
40 words
The initialization method of claim 4 further comprising the step of repeating said initialization method if no incoming signals are received after a third predetermined number of signals are transmitted following the termination of the transmission of said synchronization signals.
Claim 8
Independent Claim
104 words
A method for synchronizing a first and second interface on a communication link comprising the steps of: (a) receiving an incoming synchronization signal from said second interface; (b) then transmitting at least a first predetermined number of synchronization signals from said first interface; (c) receiving a second incoming synchronization signal from said second interface; (d) terminating the transmission of synchronization signals from said first interface after both a second incoming synchronization signal has been received and said first predetermined number of synchronization signals has been transmitted; and (e) generating an available signal at regular intervals following the reception of the second incoming synchronization signal.
Claim 9
Independent Claim
104 words
A method for synchronizing a first and second interface on a communication link comprising the steps of: (a) receiving an incoming synchronization signal from said second interface; (b) then transmitting at least a first predetermined number of synchronization signals from said first interface; (c) receiving a second incoming synchronization signal from said second interface; (d) terminating the transmission of synchronization signals from said first interface after both a second incoming synchronization signal has been received and said first predetermined number of synchronization signals has been transmitted; and (e) generating an available signal at regular intervals following the reception of the second incoming synchronization signal.
Claim 10
Dependent Claim
34 words
The synchronization method of claim 7 further comprising the step of checking for errors in incoming signals and wherein said step of terminating requires that the second incoming synchronization signal be received without errors.
Claim 11
Dependent Claim
28 words
The synchronization method of claim 8 further comprising the step of repeating steps b, c, d and e if three consecutive signals are received each containing an error.
Claim 12
Dependent Claim
49 words
The synchronization method of claim 7 further comprising the step of counting synchronization signals as they are received and repeating steps b, c, d and e if the number of synchronization signals received exceeds a second predetermined number, said second predetermined number being larger than said first predetermined number.
Claim 13
Dependent Claim
28 words
The synchronization method of claim 7 further comprising the step of transmitting signals over said communication link at regular intervals after terminating the transmission of said synchronizing signals.
Claim 14
Dependent Claim
43 words
The synchronization method of claim 11 further comprising the step of repeating steps b, c, d and e if no incoming signals are received after a third predetermined number of signals are transmitted following the termination of the transmission of said synchronizing signals.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |