| 摘要 |
A test instrument employs main and remote test units at respective ends of a cable under test. The units operate in an active or passive measurement mode, wherein one of the units begins as the active unit, applying test signals to the cable under test and making a set of measurements related thereto, while the other unit also takes measurements based on the signals applied by the first end. Then, after a set of measurements has been completed, the units swap roles, and the original passive end becomes the active end, applying test signal stimuli and making measurement based thereon, while the original active end now becomes passive, and takes a series of corresponding measurements based from the test stimuli from the active end. The measurements are thereby overlapped and accomplished from both ends of the cable, saving time. Measurement may include near end cross talk (NEXT), far end cross talk (FEXT), return loss, electromagnetic interference and insertion loss. |
