| 摘要 |
PURPOSE:To improve the reliability of system by holding decentralizingly a digital line circuit function, a register function or the like to each terminal device for making each intelligent and providing a network managing function of a loop network to a common control section. CONSTITUTION:Intelligent multi-function telephone sets (IDEP) 21, 23 and an intelligent telephone set (ITEL) 22 are provided additionally with the digital line function, the register function or the like so as to be made intelligent. Each terminal device is connected to a TDSW18 via digital transmisson lines L0-L4, and the digital transmission line between adjacent terminal devices forms the loop network via the reflexed digital link and a common control section (CNT) 25 at the TDSW18 respectively. Since the CNT25 is inserted and connected to the loop network in this way for attaining the network management, the miniaturization is attained and the reliability of system is improved by the decentralization of failure of the control function. |
