发明名称 |
Method of and a circuit for energizing a subscriber's circuit in a telephone system |
摘要 |
A method of energizing a subscriber's circuit in a telephone system having two separate constant-current sources arranged symmetrically to the subscriber's station is disclosed. Current flowing through the two lines of the circuit is measured by a shunt, and differences between the line currents are compensated by a regulating device which applies such reference voltages to respective current sources as to supply a maximum permissible current in each line. If this maximum value is exceeded, then the regulating device automatically turns off, and a reduced reference voltage is applied to the current sources so as to return to the maximum permissible value of the curent.
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申请公布号 |
US4525602(A) |
申请公布日期 |
1985.06.25 |
申请号 |
US19820424979 |
申请日期 |
1982.09.27 |
申请人 |
TE KA DE FELTEN & GUILLEAUME FERNMELDEANLAGEN GMBH |
发明人 |
ROBRA, JOERG;GOSCHIN, HANS |
分类号 |
H04M19/00;(IPC1-7):H04M19/00 |
主分类号 |
H04M19/00 |
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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