TTR offset control apparatus and method in asymmetric digital subscriber line
First Claim
1. An offset control method for matching Asynchronous Digital Subscriber Line (ADSL) equipment with Time-Compression Multiplexing Integrated Service Digital Network (TCM-ISDN) equipment, the method comprising the steps of:
- synchronizing first and second clocks with each other, the first and second clocks being synchronized with a TTRc clock which is a reference clock for entering the ADSL equipment;
dividing the synchronized second clock into a predetermined magnitude of a third clock to produce a divided clock;
classifying the TTRc clock into high and low clocks by using the divided third clock, and counting the high and low clocks, respectively; and
compensating the counted high and low clocks according to a preset offset adjustment value so as to produce a compensated fourth clock, and providing the compensated fourth clock, together with the first and second clocks, to the ADSL equipment.
1 Assignment
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Accused Products
Abstract
The present invention relates to an apparatus and method for TCM Timing Reference (TTR) offset control in an Asymmetric Digital Subscriber Line (ADSL), the apparatus and method controlling TTR offset in order to remove Near End Crosstalk (NEXT) or Far End Crosstalk (FEXT) noise which would otherwise take place in services due to matching between an Asymmetric Digital Subscriber Line (ADSL) and a Time-Compression Multiplexing Integrated Service Digital Network (TCM-ISDN). The offset control method includes the steps of: synchronizing first and second clocks with each other, the first and second clocks being synchronized with a TTRc clock which is a reference clock for entering the ADSL equipment; dividing the synchronized second clock into a predetermined magnitude of a third clock; classifying the TTRc clock into high and low clocks by using the divided third clock and counting the high and low clocks, respectively; and compensating the counted high and low clocks according to a preset offset adjustment value so as to produce a compensated fourth clock, and providing the fourth clock, together with the first and second clocks, to the ADSL equipment.
6 Citations
25 Claims
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1. An offset control method for matching Asynchronous Digital Subscriber Line (ADSL) equipment with Time-Compression Multiplexing Integrated Service Digital Network (TCM-ISDN) equipment, the method comprising the steps of:
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synchronizing first and second clocks with each other, the first and second clocks being synchronized with a TTRc clock which is a reference clock for entering the ADSL equipment; dividing the synchronized second clock into a predetermined magnitude of a third clock to produce a divided clock; classifying the TTRc clock into high and low clocks by using the divided third clock, and counting the high and low clocks, respectively; and compensating the counted high and low clocks according to a preset offset adjustment value so as to produce a compensated fourth clock, and providing the compensated fourth clock, together with the first and second clocks, to the ADSL equipment. - View Dependent Claims (2, 3, 4)
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5. An offset control method for matching Asynchronous Digital Subscriber Line (ADSL) equipment with Time-Compression Multiplexing Integrated Service Digital Network (TCM-ISDN) equipment, the method comprising the steps of:
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synchronizing NTR and ADSL DSP clocks with each other, the NTR and ADSL DSP clocks being synchronized with a TTRc clock which is a reference clock for entering the ADSL equipment; dividing the synchronized ADSL DSP clock into a predetermined magnitude to produce a divided clock; classifying the TTRc clock into high and low clocks by using the divided clock, and counting the high and low clocks, respectively; and compensating the counted high and low clocks in high and low periods, respectively, according to an offset adjustment value set by user selection to produce a compensated TTRp clock, and providing the compensated TTRp clock, together with the NTR and ADSL DSP clocks, to the ADSL equipment. - View Dependent Claims (6, 7, 8)
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9. An offset control method for matching Asynchronous Digital Subscriber Line (ADSL) equipment with Time-Compression Multiplexing Integrated Service Digital Network (TCM-ISDN) equipment, the method comprising the steps of:
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synchronizing NTR and ADSL DSP clocks with each other, the NTR and ADSL DSP clocks being synchronized with a TTRc clock which is a reference clock for entering the ADSL equipment; dividing the synchronized ADSL DSP clock into a predetermined magnitude to produce a divided clock; classifying the TTRc clock into high and low clocks by using the divided clock, and counting the high and low clocks, respectively; and offset-compensating the counted high and low clocks in high and low periods, respectively, according to a propagation delay value provided from the ADSL equipment so as to produce a compensated TTRp clock, and providing the compensated TTRp clock, together with the NTR and ADSL DSP clocks, to the ADSL equipment. - View Dependent Claims (10, 11, 12)
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13. An offset control apparatus for matching Asynchronous Digital Subscriber Line (ADSL) equipment with Time-Compression Multiplexing Integrated Service Digital Network (TCM-ISDN) equipment, the apparatus comprising:
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a synchronizer for synchronizing first and second clocks with each other, the first and second clocks being synchronized with a TTRc clock which is a reference clock for entering the ADSL equipment; and an offset compensator for dividing the synchronized second clock outputted from the synchronizer into a predetermined magnitude of a third clock, for classifying the TTRc clock into high and low clocks by using the divided third clock, for counting the high and low clocks respectively, and for compensating the counted high and low clocks according to a preset offset 1I adjustment value to produce a compensated fourth clock, and providing the compensated fourth clock, together with the first and second clocks, to the ADSL equipment. - View Dependent Claims (14, 15, 16, 17)
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18. An offset control apparatus for matching Asynchronous Digital Subscriber Line (ADSL) equipment with Time-Compression Multiplexing Integrated Service Digital Network (TCM-ISDN) equipment, the apparatus comprising:
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a synchronizer for synchronizing NTR and ADSL DSP clocks with each other, the NTR and ADSL DSP clocks being synchronized with a TTRc clock; an offset compensator for dividing the synchronized ADSL DSP clock provided from the synchronizer into a predetermined magnitude, for classifying the TTRc clock into high and low clocks by using the divided clock and counting the high and low clocks, respectively, for compensating the counted high and low clocks in high and low periods, respectively, according to a provided offset adjustment value so as to produce a compensated TTRp clock, and for providing the TTRp clock, together with the NTR and ADSL DSP clocks, to the ADSL equipment; and an offset adjustment value selector for providing the offset adjustment value to the offset compensator according to user selection. - View Dependent Claims (19, 20, 21)
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22. An offset control apparatus for matching Asynchronous Digital Subscriber Line (ADSL) equipment with Time-Compression Multiplexing Integrated Service Digital Network (TCM-ISDN) equipment, the apparatus comprising:
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a synchronizer for synchronizing NTR and ADSL DSP clocks with each other, the NTR and ADSL DSP clocks being synchronized with a TTRc clock; and an offset compensator for dividing the synchronized ADSL DSP clock into a predetermined magnitude, for classifying the TTRc clock into high and low clocks by using the divided clock and counting the high and low clocks, respectively, for offset-compensating the counted high and low clocks in high and low periods, respectively, according to a propagation delay value provided from the ADSL equipment so as to produce a compensated TTRp clock, and for providing the compensated TTRp clock, together with the NTR and ADSL DSP clocks, to the ADSL equipment. - View Dependent Claims (23, 24, 25)
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Specification