| 摘要 |
1,055,867. Automatic exchange systems- SIEMENS & HALSKE A.G. March 4, 1965 [March 5, 1964], No. 9213/65. Heading H4K. In a PBX employing a common circuit for identifying a calling line, the latter being connected to an idle link circuit and thence to a register, in the event of the caller hanging up before a link circuit is seized or of dialling prematurely, the common identifier is at once released, and similar action takes place if the connection to the register proves to be faulty. Thus the holding of the identifier is not dependent on a timing circuit. Specification 1.022,022 is referred to. |
