| 摘要 |
<p>The measuring device (1) is inserted into a two-wire subscriber transmission line, in the vicinity of a terminal block of a telephone exchange distribution panel, in order to make a measurement of quality of transmission in the line. The device comprises two bidirectional transmission circuits with echo cancellation (10, 11) which are transparent to the useful data travelling down the line. One of the two circuits (10) is programmed so as to count transmission errors specific to the line code. A logic circuit for transfer (15) periodically reads an error counter of the circuit (10) in order to extract numbers of line errors so that an acquisition circuit (16) may acquire these numbers during a measurement period. In the context of a quality measurement correlation system, the processing circuit (17) correlates these numbers of line errors with numbers of binary errors detected at one of the ends of the line for a given noise disturbing the line. <IMAGE></p> |
