Monitoring a synchronous digital hierarchy transmission path

Details Monitoring a synchronous digital hierarchy transmission path Monitoring a synchronous digital hierarchy transmission path

1996-03-29

1998-11-24

Vu, Huy D.

Multiplex communications

Diagnostic testing

Determination of communication parameters

370522, H04J 314

Patent

active

058417621

ABSTRACT:
A system monitors utilization of a tributary to a main SDH transmission path. The main SDH transmission path is arranged to transport a series of data frames, each of which contains virtual containers. A data signal from tributary is loaded into virtual containers reserved to carry the data signal. The monitoring system includes an optical service unit and a computer. The optical service unit monitors bytes of the virtual containers reserved to carry the tributary for the presence of a predetermined bit pattern and transmits a report containing the results of the monitoring to the computer. In the computer, data contained in the report is used to evaluate utilization of the tributary. One example of the bit pattern which is monitored is the presence of all binary "1"s in each byte of tile payload of a virtual container.

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Hershey et al, "Real time Traffic Measurements for High-Speed Networks", BT Technol J, vol. 13, No. 3, Jul. 1995, pp. 113-122.

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