| 摘要 |
The invention relates to a method for measuring unidirectional transmission characteristics, such as packet propagation time (Dnetz), fluctuations in propagation time (tjitter) and results that can be derived from this, in a telecommunications network (10), such as the Internet, an intranet or similar. Multiple switching devices (12 to 22) and other devices (34, 36, 38) are interconnected by connection lines (24) in the telecommunications network. Test packets that are sent between at least two measuring computers (26, 28) are transmitted from the first measuring computer (26) to the second measuring computer (28) via a measuring path (32). The first measuring computer (26) detects the departure time (t1) of the outgoing test packet. This time is sent with the test packet. The second measuring computer (28) detects the arrival time (t2) of the test packet. The propagation time (Dnetz) of the test packet - the measuring result - is determined by calculating the difference between the time of departure from the first measuring computer (26) and the time of arrival in the second measuring computer (28). According to the invention, the two measuring computers (26, 28) are time-synchronised for the determination of the measuring result, the time being continuously transmitted to both measuring computers (26; 28) through satellite systems (30), for example GPS.
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