| 摘要 |
PURPOSE:To perform an initial setting without giving any effect to a call which is under the restarted service, by displaying the combination of magnetic holding type relay contacts on a scanner in the form of the information showing in service. CONSTITUTION:The earth is supplied to terminals RD0 and RD1 as well as a barrery supplied to a terminal RDR of a relay driver in the state under which a call is connected through a trunk device. As a result, relays S and T work to actuate each relay contact. Then the service is set in a route of A0-contact S<0>-D1 and B0-E1 and D0-contact S<1>-contact t<0>-A1 and E0-B1. At the same time, a loop is formed in a route of SN0-contact S2-contact t<2>-SN1. This loop is connected to a scanner. The call under the busy receives no effect of a fault, if arises to the power source of an exchange device, since the channel setting relay is a magnetic holding type one. Then the loop is read when the service is restarted to give the initial setting to the trunk devices excepting the one that has a display in service. |
