| 摘要 |
PROBLEM TO BE SOLVED: To propose a method for appropriately evaluating the storage design of a wideband transmitter. SOLUTION: (1) The measurement data of the near-end crosstalk characteristics of a simulation line 10 are kept. (2) After setting various kinds of parameters such as the transmission speed of an xDSL line desired to be stored newly, the measurement data of a transmission spectrum are kept. (3) The geometric storage position of an existing transmission line and the xDSL line is recognized on the basis of the line opening conditions of a local laying cable scheduled to be arranged. (4) Pseudo crosstalk noise levels are calculated by using kept data in 1 and 2 for all line combinations satisfying the geometric storage position in 3 and the line combination for which the value is the largest is selected. (5) A simulation line length is set to a request transmission distance, a coexisting transmission test is performed by the line combination selected in 4, and the transmission quality of the existing transmission line at the time of coexisting transmission is measured. (6) On the basis of whether request transmission quality is satisfied, the storage propriety of the xDSL line desired to be stored newly is judged. COPYRIGHT: (C)2006,JPO&NCIPI
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