发明名称 |
Subscriber line interface and power circuit |
摘要 |
A subscriber line circuit which truly implements all of the BORSCHT functions and which does not rely on an external ringing generator to provide the ringing voltage when needed is disclosed. This implementation is achieved by recognizing that supervisory and ringing signals occur in some sort of sequence and, therefore, do not have to be generated simultaneously. Based on this recognition, we provide a circuit which truly implements all of the BORSCHT functions and includes a power section that generates each of the supervisory signals, e.g., -48 volts and -24 volts, and alerting signal, e.g., ringing signal, in turn and as required.
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申请公布号 |
US5848149(A) |
申请公布日期 |
1998.12.08 |
申请号 |
US19950451249 |
申请日期 |
1995.05.26 |
申请人 |
LUCENT TECHNOLOGIES INC. |
发明人 |
CHEN, ROBERT K.;FRAZIER, PAUL W.;GAMMEL, JOHN C.;MARSH, ANDREW J.;ROY, APURBA;SPIRES, DEWAYNE ALAN |
分类号 |
H04M3/24;H04M3/00;H04M3/22;H04M19/00;H04M19/02;H04M19/04;H04Q3/42;(IPC1-7):H04M1/74 |
主分类号 |
H04M3/24 |
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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