Token ring local area network testing apparatus for phase jitter

Details Token ring local area network testing apparatus for phase jitter Token ring local area network testing apparatus for phase jitter

1993-01-11

1994-05-03

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

3701053, 371 204, 371 206, 375 10, H04J 314

Patent

active

053094280

ABSTRACT:
A token ring local area network (LAN) testing apparatus is provided. The apparatus is able to conduct a phase jitter measurement without disruption of normal token ring operation. The apparatus transmits a frame that includes phase jitter test data. This frame is transmitted into the token ring, together with a clock signal. After return of the frame with the phase jitter test data, a comparison is made between the recovered clock signal accompanying this frame and a reference clock signal. The result of this comparison provides a sample used in determining phase jitter. In making the measurement, an interpolation circuit is utilized to increase the resolution of the time difference between the recovered clock signal and the reference clock signal. A clamp circuit is used to ensure that each interpolation begins at the same reference voltage, as well as ensuring that the interpolation process is properly discontinued.

REFERENCES:
patent: 3956601 (1979-05-01), Harris et al.
patent: 4112264 (1988-09-01), Abramson et al.
patent: 4837488 (1989-06-01), Donahue
patent: 4907227 (1990-03-01), Unno

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