Excavating
Patent
1996-07-25
1998-09-01
Beausoliel, Jr., Robert W.
Excavating
375356, G06F 1100
Patent
active
058020829
ABSTRACT:
In a process for determining the cell propagation time between two arbitrary test points in an asynchronous network, specifically an ATM network, as well as a device for performing this process, the cell propagation time between two test points using two free-running clocks, i.e., non-synchronized clocks, is determined. For this purpose, a plurality of test cells are transmitted bidirectionally between the two test points and the respective send and receive instants are measured and recorded. With the help of a linear regression analysis of the measured send and receive instants, the time and frequency offsets between the two clocks can be estimated. The cell propagation time is then determined from the estimated frequency offset, the estimated time offset, and the measured send and receive instants of a selected test cell traveling in the upward and/or downward direction.
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Bakker et al., "Asynchroner Transfer-Modus: Graundbaustein fur das Breitband-ISDN, Teil III, Verkehr und Vermittlung," In: Nachrichtentechn., Elektron., Berlin 42, 1992, 4, S. 154-158. (No English translation).
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Tobiet, Henri, "Modulare Testarchitektur fur breitbandige ATM-Netze," In: ntz, Bd. 45, 1992, H. 2, S. 88, 89, 92, 94, 97 (No English translation).
Beausoliel, Jr. Robert W.
Deutsche Telekom AG
Tu Trinh L.
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