| 摘要 |
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.
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