| 摘要 |
PROBLEM TO BE SOLVED: To judge whether a specified subscriber line is adaptive to a high speed data service by receiving a response signal from the subscriber line in accordance with transmission of a testing signal, analyzing the signal and judging the high speed service capability of the subscriber line. SOLUTION: A test sound device 220 generates a designated sound or signal during a testing operation and the designated sound or signal is transmitted to the subscriber line 251 via a link 215. The whole testing signals are transmitted to a user of customer private equipment 250 by an amplitude level being lower than that of a dial sound or another call processing signal so as not to be a burst. The dial sound and each testing signal are reflected by the subscriber line and returned to the test sound device 220 via the bi-directional link 215. When the reflected signal is received by the device 220, it is analyzed and compared with experiment data or simulation data stored in a database 226. The device 220 judges the high speed service correspondence to be kept by the subscriber line 251 by the minute analysis or comparison of the signal.
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