发明名称 |
Identifier for manual switchboards with conference facility |
摘要 |
A line identifier at a telecommunication switchboard comprises a matrix of magnetic-induction elements serving as current sensors for detecting a request for establishing a connection between a selected incoming line and a selected outgoing line. The sensors are connected to a multiplexer for providing samples in a time-division mode to a logic circuit controlled by a pair of microprogrammers and addressing a read/write memory for storing information on the states of the sensors. The logic network, upon receiving from a sensor an identification request for a selected outgoing line, such request implicitly coding a selected input line, activates a relay which closes a circuit enabling the energization of a sensor whose output signal to the logic network identifies the outgoing line selected via the switchboard for connection to the prior-identified incoming line. Upon successful identification of a selected incoming line and at least one selected outgoing line, the logic network emits energization signals to a pair of relays which thereupon break the circuits energizing the sensors and establish a link between the selected incoming line and the selected outgoing line. The logic network is connected via its control microprocessors to a computer for communicating thereto the identities of interconnected lines. The logic network with its associated multiplexer and microprocessors may be duplicated for cross-checking operations.
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申请公布号 |
US4252998(A) |
申请公布日期 |
1981.02.24 |
申请号 |
US19780953163 |
申请日期 |
1978.10.20 |
申请人 |
CSELT - CENTRO STUDI E LABORATORI TELECOMUNICAZION S.P.A. |
发明人 |
ASTEGIANO, LUCIANO;VAN WEEN, WOUTER M. D. |
分类号 |
H04Q3/545;H04M3/60;H04M3/64;H04M5/18;H04M15/00;H04M15/26;H04Q3/00;(IPC1-7):H04M5/04 |
主分类号 |
H04Q3/545 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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