Apparatus for measuring transmission time utilized for data coll

Details Apparatus for measuring transmission time utilized for data coll Apparatus for measuring transmission time utilized for data coll

1996-03-20

1998-04-14

Chin, Stephen

Pulse or digital communications

Testing

370517, 370519, H04B 346, H04B 1700

Patent

active

057402000

ABSTRACT:
An apparatus for measuring transmission time is utilized for a data collection system including an observation station situated in a given wide-ranging region, and a collection station for collecting data from the observation station over a transmission line, and is designed for measuring the transmission time necessary for a signal to propagate through a transmission path. The apparatus is configured to have a signal detecting unit for taking out, from a signal indicating unit which indicates the states of various signals to be transmitted through a transmission path of a transmission line using light emitting devices or the like, and for detecting a first signal sent from a collection station in order to start data collection and a second signal returned from an observation station in order to notify that the first signal has been received, in a state in which the data collection system is kept running and the electrically uncoupled state relative to the transmission path is retained; and a transmission time calculating unit for calculating the transmission time of a signal propagating through the transmission path on the basis of a difference between the time instant at which the first and second signals are detected.

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