| 摘要 |
PURPOSE:To set the data transmission speed and the number of lines requested at each point of time, by providing a switch circuit so as to connect one of optional input/output ports having plural data transmission speeds with a data transmission line. CONSTITUTION:A request stopping the data transmission in 64kb/s between terminal devices 100A and 100B and transmitting data in 32kb/s between the terminal devices 101A and 101B, is transmitted to a control section 109A,B. Control sections 109A, 109B connect respective switch circuits 104A, 104B to input/output ports 107A, 107B of the terminal devices 101A, 101B. The control sections 109A, 109B give a command to data transmission control circuits 103A, 103B to be operated in the clock of 32kb/s at the same time. |
