| 摘要 |
PURPOSE:To raise the reliability of a system without duplicating the system by providing two systems of connection lines of the system connected to the distributed station of every other divided service area and of the system connected to the distributed station of another every other divided service area neighboring alternately to said devided service area. CONSTITUTION:While the distributed stations 11, 12, 13, 14 are started successively so that the service area of a whole building 6 is serviced, even when trouble occurs in the connection lines 21, 23 or the distributor 5 connected to these connection lines or the distributed stations 11, 13 of the system of one side, for instance, a first system 31, and the distributed station 11 of a first floor 61 is stopped, the first floor 61 can receive the service of the distributed station 12 of a neighboring second floor 62, and besides, even when the distributed station 13 of a third floor 63 is stopped, the third floor 63 can receive similarly the service from the distributed station 12 of the neighboring second floor 62 and the distributed station 14 of a fourth floor 64, and therefore,the service of all the areas as the system can be maintained. |
