OPTICAL TIME DOMAIN REFLECTORY MEASUREMENTS Sample Clauses

OPTICAL TIME DOMAIN REFLECTORY MEASUREMENTS. (O.T.D.R.): The purpose of this test is to measure any problem points with respect to the transmission or reflection losses of the fibre link and to locate the position of these points. This test is executed in the field. This measurement is done with an optical reflectometer, connected to both fibres end points and is used to perform remote measurements. The optical reflectometer launches power into the fibre and analyses the reflected signal, which permits the fibre attenuation due to scattering, absorption and reflections to be calculated. Part of the scattered power pulse is sent back to the optical reflectometer where it is detected and displayed on a cathode-ray-screen. The rate of returned power depends on the power launched into the fibre and on the back scattering factor of the latter. The optical reflectometer displays on its screen the optical power of the received signals on a logarithmic scale. -------------------------------------------------------------------------------- 29 August 1996 OPTICAL CABLE SPECIFICATIONS Page 12/24 ALCATEL 1996 Issue 6.0 55 ALCATEL Direct reading of the following can be made: - On the X axis : distance between each point of the fibre and the measuring instrument. - On the Y axis : power scattered by each point of the fibre. Any sudden drop of the curve means punctual attenuation. This measure is performed in both directions of a link. It is the average of both results which is considered. This measure also provides an accurate value of the Return Loss for each O.D.F. situated at both extremities of the measured link.
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