Hashimoto Masao

TL;DR: An ISDN remote switching unit for accommodating analogue telephone subscriber lines and ISDN digital subscriber lines comprises at least one signal converter for each of the conventional analogue subscriber, and a traffic concentrator connected to the signal converter and disposed remote from a host exchange station.

TL;DR: In this article, an integrated service network (ISDN) is proposed to connect subscriber lines through a packet switching system to incoming or outgoing packet switching calls without passing them through a circuit switching system.

Abstract: PURPOSE:To switch a transmission line automatically without causing out of frame synchronization by providing a synchronizing circuit and a fault detection circuit for clock interrupt of a transmission line, a CRC error and out of frame synchronization to a reception section of each transmission line. CONSTITUTION:A clock is extracted by synchronizing circuits 9,12 after B/U conversion as to each of systems 0, 1, frame synchronization is applied and a fault is detected by transmission line fault detection circuits 10, 13. Then fault information is informed to a fault display section 4 and information such as clock interrupt of a transmission line, a CRC error and out of frame synchronization is informed to a transmission line switching control circuit 16. The data of the systems 0, 1 is selected by a transmission line switching selector 14 and the data is outputted in the timing in matching with the transmission line terminator 1 with a frame phase correction circuit 15. The circuit 16 decides the system switching through the receipt of each information when there is not fault in the transmission line of the system not in use and there is a fault in the transmission line of the system in operation and outputs the switching signal to the selector 14 to switch the transmission line.

TL;DR: In this article, the authors propose to allow a subscriber to receive services such as circuit exchange and packet exchange on the same subscriber line by separating a circuit exchange call and a packet call, line-concentrating the separated packet call so as to multiplex a packet, multiplexing said packet and the circuit exchange calls with the prescribed time slot and transmitting them to a digital transmission line.

TL;DR: In this paper, the authors propose a scheme to convert the line signal of an existing analog telephone subscriber to an ISDN digital subscriber line signal system with either an existing analogue telephone subscriber unit or the service trunk of a remote station device.