Patent ID: 6665315
Filing Date: 2003-12-16
Classification: H04J,H04L,H04Q

Abstract:
A transmission apparatus for use in a master station in a passive double-star communication network in which the master station is coupled by a common transmission channel to a star coupler and the star coupler is coupled by individual transmission channels to a plurality of slave stations, the master station specifying cell transmission timings at which individual slave stations may transmit cells, each slave station modifying the specified cell transmission timings by an individual amount so that when the cells are transmitted from the plurality of slave stations through the star coupler, the cells align on a single time axis without overlapping, comprising:a management unit automatically acquiring identification information of those of said slave stations having said identification information that has not yet been set in the master station; and a measurement unit coupled to said management unit, measuring a propagation delay time between one of said slave stations and the master station, thereby determining said individual amount, after the management unit has acquired the identification information of said one of said slave stations; wherein said management unit controls said measurement unit by sending said measurement unit a first command and a second command; said measurement unit responds to said second command by giving said one of said slave stations permission to transmit a cell for measurement of said propagation delay time, and observing a time of arrival of said cell; and said measurement unit responds to said first command by giving any of said slave stations permission to transmit cells for acquisition of identification information.