ISDN general subscriber unit of electronic exchanger

摘要

The present invention relates to an ISDN general subscriber matching apparatus for an electronic exchanger, and a communication path between an IMP and an upper processor is made redundant, so that communication interruption can be prevented even when a communication path is obstructed and an operating clock is supplied from the outside It is not necessary to provide a separate clock division / PLL circuit, so that it is possible to lower the production terminal and greatly improve the communication speed between the TSW and the DLCD.