US5682408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of transmitting sync clock and sync data between shelves of a synchronous digital hierarchy system
Assignee: Fujitsu Ltd
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Filing: 1996-02-23
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Granted: 1997-10-28
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Expires: 2016-02-23
Abstract
Abstract A synchronization control method for a synchronous digital hierarchy system includes the steps of: at a first selecting unit, selecting a given number of timing sources, from among a plurality of first timing sources within a main shelf, in accordance with user setting data, and outputting the given number of the selected timing sources; at a first quality data generating unit, outputting quality data of one or more of the selected timing sources when the one or more of the selected timing sources have no quality data; at a second selecting unit, selecting one or more timing sources from among a plurality of second timing sources within a slave shelf when any timing sources set by the user setting data are included in the second timing sources within the slave shelf, and transmitting the selected one or more timing sources to the main shelf; at a second quality data generating unit, outputting the quality data of the one or more timing sources supplied from the second selecting unit, and transmitting the quality data to the main shelf; and at a first quality selecting unit, selecting a timing source having the highest quality value among the quality data from the first and second quality data generating units, from among the given number of the timing sources, and outputting the selected timing source to the main shelf as equipment clock, and transmitting the equipment clock to the slave shelf.
Inventors
- 👤 Kouji Tanonaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:37
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0635; H04J3/0685; H04J3/0688
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
345 words
A method of transmitting sync data and sync clock between shelves of a synchronous digital hierarchy system, the system including a main shelf containing main equipment and a slave shelf containing slave equipment, wherein user setting data indicating a plurality of timing sources and respective quality data of the timing sources is supplied to each of the main shelf and the slave shelf, said method comprising the steps of: selecting the timing sources, from among a plurality of first timing sources within the main shelf, in accordance with the user setting data within the main shelf when the timing sources indicated by the user setting data are included in the first timing sources, and outputting the selected timing sources; generating respective quality data of the selected timing sources in accordance with the user setting data within the main shelf; selecting one or more timing sources from among a plurality of second timing sources within the slave shelf in accordance with the user setting data within the slave shelf when said one or more timing sources are indicated by said user setting data and included in the second timing sources within the slave shelf, and transmitting said selected one or more timing sources from the slave shelf to the main shelf; generating respective quality data of said selected one or more timing sources within the slave shelf in accordance with said user setting data, and transmitting said respective quality data of said selected one or more timing sources from the slave shelf to the main shelf; and selecting a timing source having the highest quality value among the quality data generated within the main shelf and among the quality data transmitted from the slave shelf, said timing source having the highest quality value being selected from among the selected timing sources within the main shelf and among the selected one or more timing sources within the slave shelf, and outputting the selected timing source having the highest quality value as an equipment clock, and transmitting the equipment clock from the main shelf to the slave shelf.
Claim 2
Independent Claim
345 words
A method of transmitting sync data and sync clock between shelves of a synchronous digital hierarchy system, the system including a main shelf containing main equipment and a slave shelf containing slave equipment, wherein user setting data indicating a plurality of timing sources and respective quality data of the timing sources is supplied to each of the main shelf and the slave shelf, said method comprising the steps of: selecting the timing sources, from among a plurality of first timing sources within the main shelf, in accordance with the user setting data within the main shelf when the timing sources indicated by the user setting data are included in the first timing sources, and outputting the selected timing sources; generating respective quality data of the selected timing sources in accordance with the user setting data within the main shelf; selecting one or more timing sources from among a plurality of second timing sources within the slave shelf in accordance with the user setting data within the slave shelf when said one or more timing sources are indicated by said user setting data and included in the second timing sources within the slave shelf, and transmitting said selected one or more timing sources from the slave shelf to the main shelf; generating respective quality data of said selected one or more timing sources within the slave shelf in accordance with said user setting data, and transmitting said respective quality data of said selected one or more timing sources from the slave shelf to the main shelf; and selecting a timing source having the highest quality value among the quality data generated within the main shelf and among the quality data transmitted from the slave shelf, said timing source having the highest quality value being selected from among the selected timing sources within the main shelf and among the selected one or more timing sources within the slave shelf, and outputting the selected timing source having the highest quality value as an equipment clock, and transmitting the equipment clock from the main shelf to the slave shelf.
Claim 3
Dependent Claim
71 words
A method according to claim 1, wherein said method further comprises the step of, at a second quality selecting unit, selecting only one timing source, from among said selected one or more timing sources from said second selecting unit, based on the respective quality data from said second quality data generating unit, and transmitting said selected only one timing source from the slave shelf to the main shelf via a cable.
Claim 4
Dependent Claim
105 words
A method according to claim 1, wherein said user setting data, supplied to each of the main shelf and the slave shelf, indicates respective priority values of the timing sources in addition to the respective quality values, and said method further comprises the step of, at said first quality selecting unit, selecting a timing source having a higher priority value among the respective priority values of the selected timing sources based on said user setting data within the main shelf when two or more quality values of said selected timing sources from said first and second quality data generating units are equal to each other.
Claim 5
Dependent Claim
65 words
A method according to claim 1, wherein said method further comprises the steps of: at a main shelf transmitting unit, transmitting the quality value of the timing source selected by the first quality selecting unit, to a transmission line; and at a slave shelf transmitting unit, transmitting the quality value of the timing source selected by the first quality selecting unit to a transmission line.
Claim 6
Dependent Claim
67 words
A method according to claim 1, wherein said method further comprises the steps of: outputting the equipment clock from the main shelf to an external unit; and stopping the output of the equipment clock to the external unit when the quality value of the selected timing source selected by the first quality selecting unit is lower than a reference quality value indicated by the user setting data.
Claim 7
Dependent Claim
60 words
A method according to claim 1, wherein said method further comprises the step of, at said first quality data generating unit, transferring one or more quality values of the selected timing sources to said first quality selecting unit when said one or more timing sources are indicated by the user setting data but not included in the first timing sources.
Claim 8
Dependent Claim
109 words
A method according to claim 1, wherein said system includes the main shelf containing the main equipment and a plurality of slave shelves each containing the slave equipment, and said method further comprises the steps of: transmitting said equipment clock from the main shelf to the respective slave shelves via a common equipment clock line; transmitting said selected one or more timing sources from each slave shelf to the main shelf via common timing source lines in accordance with the priority values of said selected one or more timing sources; and transmitting said quality data from each slave shelf to the main shelf via a common quality data bus.
Claim 9
Independent Claim
427 words
A method of transmitting sync data and sync clock between shelves of a synchronous digital hierarchy system, the system including a main shelf containing main equipment and a slave shelf containing slave equipment, wherein user setting data indicating a plurality of timing sources and respective quality data of the timing sources is supplied to each of the main shelf and the slave shelf, said method comprising the steps of: at a slave shelf list selecting unit, selecting one or more timing sources, from among a plurality of second timing sources within the slave shelf, in accordance with the user setting data when said one or more timing sources are indicated by the user setting data but not included in the main shelf, and transmitting said selected one or more timing sources from the slave shelf to the main shelf; at a first main shelf list selecting unit, selecting the plurality of timing sources, from among a plurality of first timing sources within the main shelf and said selected one or more timing sources supplied from said slave shelf list selecting unit, in accordance with the user setting data, and outputting said selected timing sources; at a slave shelf quality data selector, selecting respective quality data of said selected one or more timing sources from said slave shelf list selecting unit, from among respective quality data of said second timing sources within the slave shelf, and transmitting said selected quality data from the slave shelf to the main shelf; at a first main shelf data selector, selecting respective quality data of said selecting timing sources from said first main shelf list selecting unit, from among respective quality data of the first timing sources and said selected quality data from said slave shelf quality data selector, and outputting said selected quality data; at a main shelf quality data selecting unit, selecting the highest quality value among said selected quality data from said first main shelf data selector, and outputting said highest quality value; at a second main shelf list selecting unit, selecting a timing source having the highest quality value from among the selected timing sources from said first main shelf list selecting unit, and outputting the selected timing source having the highest quality value as an equipment clock, and transmitting the equipment clock from the main shelf to the slave shelf; and at a second main shelf data selector, selecting a piece of quality data of the selected timing source from said second main shelf list selecting unit, and transmitting said selected quality data to a transmission line.
Claim 10
Independent Claim
427 words
A method of transmitting sync data and sync clock between shelves of a synchronous digital hierarchy system, the system including a main shelf containing main equipment and a slave shelf containing slave equipment, wherein user setting data indicating a plurality of timing sources and respective quality data of the timing sources is supplied to each of the main shelf and the slave shelf, said method comprising the steps of: at a slave shelf list selecting unit, selecting one or more timing sources, from among a plurality of second timing sources within the slave shelf, in accordance with the user setting data when said one or more timing sources are indicated by the user setting data but not included in the main shelf, and transmitting said selected one or more timing sources from the slave shelf to the main shelf; at a first main shelf list selecting unit, selecting the plurality of timing sources, from among a plurality of first timing sources within the main shelf and said selected one or more timing sources supplied from said slave shelf list selecting unit, in accordance with the user setting data, and outputting said selected timing sources; at a slave shelf quality data selector, selecting respective quality data of said selected one or more timing sources from said slave shelf list selecting unit, from among respective quality data of said second timing sources within the slave shelf, and transmitting said selected quality data from the slave shelf to the main shelf; at a first main shelf data selector, selecting respective quality data of said selecting timing sources from said first main shelf list selecting unit, from among respective quality data of the first timing sources and said selected quality data from said slave shelf quality data selector, and outputting said selected quality data; at a main shelf quality data selecting unit, selecting the highest quality value among said selected quality data from said first main shelf data selector, and outputting said highest quality value; at a second main shelf list selecting unit, selecting a timing source having the highest quality value from among the selected timing sources from said first main shelf list selecting unit, and outputting the selected timing source having the highest quality value as an equipment clock, and transmitting the equipment clock from the main shelf to the slave shelf; and at a second main shelf data selector, selecting a piece of quality data of the selected timing source from said second main shelf list selecting unit, and transmitting said selected quality data to a transmission line.
Claim 11
Dependent Claim
105 words
A method according to claim 8, wherein said user setting data, supplied to each of the main shelf and the slave shelf, indicates respective priority values of the timing sources in addition to the respective quality values, and said method further comprises the step of, at said second main shelf list selecting unit, selecting a timing source having a higher priority value among the respective priority values of the selected timing sources based on said user setting data within the main shelf when two or more quality values of said selected timing sources from said first main shelf data selector are equal to each other.
Claim 12
Dependent Claim
69 words
A method according to claim 8, wherein said method further comprises the steps of outputting the equipment clock from the main shelf to an external unit; and stopping the output of the equipment clock to the external unit when the highest quality value of the timing source selected by said main shelf quality data selecting unit is lower than a reference quality value indicated by the user setting data.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-10-27 | 2001-04-28 | 2001-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-27 | 2005-04-28 | 2005-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-27 | 2009-04-28 | 2009-10-28 | $7700.00 | Window Closed / Lapsed |