North American type ISDN primary group basic accessor Multiple subscriber matching circuit

摘要

The present invention relates to a North American mode subscriber matching circuit in an ISDN primary group basic accessor multiple subscriber matching apparatus in an all-electronic exchanger having an ISDN function.;In order to provide a variety of services including existing voice and non-voice systems, the present invention provides a PMUX-based system, which is a first-class multi-unit device of the North American type 8 (2B + D) T1) and the exchange system, and it is also possible to easily perform the maintenance by detecting the failure state of the transmission path by using the test program embedded in the firmware, thereby increasing the reliability of the primary group accessing multi-There is an effect.