Importance

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Abstract

An H channel for controlling the use of network is selected to effectively use lines when a request for H communication is issued. An ISDN line channel selection method, whereby a plurality of B channels are bundled and serve as an H channel, and the B channels are selected according to a condition under which each of the B channels to be used is registered as either an H channel dedicated class or H channel shared use class. The method includes the steps of temporarily changing the b channels from the H channel shared use class to the H channel dedicated class if the B channels in the H channel shared use class are busy when a request for connection of the H channel has been received from a transmission side, queuing until the B channels that form the H channel dedicated class are idle, and connecting the transmission side to the H channel when the B channels that form the H channel dedicated class are idle. The class of the B channels that has been changed to an original class when connection has been completed or when communication has been terminated and disconnected, is restored.

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First Claim