| 摘要 |
A passive system for monitoring a voice, data, image, text or other telecommunications media by a customer, which connects the line (12) to be monitored to a processing unit (14) which measures the signals passing through the line (12) and compares these measured signals with predetermined values or monitors the progress of the call. The measurement means determines the static state of the line to see if the line is satisfactory and also determines the dynamic state of the lines by monitoring the progress of the call on the lines. Also, including a visual display (16) or audible alarm (16) for indicating the status of the line as determined by the comparator (14) or the call progress monitor (14).
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