| 摘要 |
Problems arise when using an Integrated Service Digital Network infrastructure ( 6 ) for providing Asymmetrical Digital Subscriber Line technology. These problems do not always occur but depend on the distance between the end-user location ( 12 ) and the central location ( 11 ), and the type of network termination ( 3 ), and result in the impossibility for the end-user to make voice calls or to send data. The problems are caused by the Asymmetrical Digital Subscriber Line splitters ( 4 ) and ( 7 ), which change the transmission characteristics of the Integrated Service Digital Network infrastructure ( 6 ) between the end-user location ( 12 ) and the central location ( 11 ). The transmission characteristics that are changed by the Asymmetrical Digital Subscriber Line splitters ( 4 ) and ( 7 ) are impedance, propagation time and insertion loss. The deviation is frequency-dependent and falls outside the internationally-defined ranges for these transmission characteristics.
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