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Withthe ISDN circuit and the like, the protocol which is used to changing transmission speed dynamically. 2 among the Bchannelsof 64kbps which is, usually communicates with just one side, but when the communications traffic increases, already using also1B channel, it is possible to communicate at speed of 2 times. It is possible to actualize without making of increase and decrease of the speed which responds to the congestion circumstance of the circuit, the user be conscious. The Cisco corporation and the Ascend Communications corporation , the BayNetworks corporation, the 3Com corporation and the U.S.Robotics corporation (the 3Com corporation absorption),the Microsoft corporation and the Sun Microsystems corporation etc. being center, standard is decided.
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