Digital communications system for an office telephone system

作者： William J. Schirmer , Nicholas M. Esser , Andrew R. Reichert , Stewart C. Brown , Lauren T. May

DOI:

关键词: Electrical engineering 、 Transmission medium 、 Token passing 、 Digital data 、 12-channel carrier system 、 Engineering 、 Electronic engineering 、 Communications system 、 Twisted pair 、 Telephone line 、 Class 4 telephone switch

摘要: A network for enabling a local area telephone system to simultaneously carry digital data and analog voice signals on the same transmission medium. Such typically includes PBX (24) twisted wire pairs (22) connected distributed handsets (20). The incorporates station units coupling both band from RF devices (26) (22). (40) are physically interconnected in star configuration with respect hub module (60) preferably located closet. plurality of (62), each uniquely by pair one (40). Each unit passive filter means separate signals. token passing procedure is used assign control multiple logical sequence.