| 摘要 |
TESTING OPTICAL FIBRE LINKS. The invention concerns apparatus for testing optical fibre links in a data communication network. The apparatus comprises communication equipment (13) for generating and receiving traffic over one or more fibre links X at a wavelength .lambda. 2, optical test means(10)for generating test signals at a wavelength .lambda.1, different from .lambda.2, and means(11)of superimposing a test signal from the test means onto a traffic signal from the communication equipment(13).
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