ISDN SUBSCRIBER MATCHING DEVICE

摘要

The ISDN primary subscriber CEPT interface circuit icludes a B-channel interface cirucit for transmitting and receiving a B-channel onto a PCM subhighway, a time/space switching cirucit for controlling each CEPT, a hybrid circuit for forming a frame, a line interface circuit for converting a unipolar signal to a bipolar signal to transmit transmitting data stream to a subscriber line, and converting the biipolar signal received from the subscriber to the unipolar signal, a D-channel interface circuit for implementing D-channel link access processing for 4 links, a common memory, and a microprocessing unit, thereby raising the reliability of a primary subscriber.