Power backup method and circuit for operation of network termination device in case of power outage

摘要

This is a technique for backing up the power of a network end device connected to an ISDN network.;In order to solve the problem that the ISDN terminal can not be used in case of power failure because the network termination unit (NTBA) connecting the ISDN terminal and the ISDN network has no auxiliary power source for the power failure operation, Back up the power of the terminating device to enable communication to the ISDN terminal during power failure.