| 摘要 |
PURPOSE:To cut off ines confirmed in a crossbar switch with relay contacts, by providing a relay operated when a called partly is busy for an outgoing register. CONSTITUTION:A relay 60 in an outgoing register is operated at a terminal 104 when a called party is busy and a contact 51 when the called partly in busy state hooks off the telephone. The relay 60 opens contacts 61 and 62. In this case, contacts 33 and 34 are already closed. That is, since terminals C1 and C2 are momentarily changed to open from 0V and restored to 0V, it is not necessary for a crossbar switch to connect terminals A2, B2 and A1, B1 and cuts off them immediately. The crossbar switch prepares vacant lines for next incoming calls. |
