| 摘要 |
<p>Measurement of round-trip delay or travel time in a communications network during in-service operation is accomplished by use of two probes (12, 13), situated at respective points of interest along the communication network, and a processor. The probes (12, 13) receive identifiable data patterns normally transmitted over the communications network and generate a time stamp when each pattern arrives at or leaves the respective point. Each probe further generates a pattern identifier based on the data in the pattern and stores the identifier and time stamp as a pair in a buffer internal to each probe. Once the internal buffer contents exceed a predetermined amount of data, the processor receives the data from the buffers to locate the departure and arrival time stamps of each pattern traveling between the probe points.</p> |
