发明名称 |
POWER FEED CIRCUIT PROVIDING BOTH ON-HOOK AND OFF-HOOK POWERFOR TELEPHONE SUBSCRIBER LOOP |
摘要 |
A power feed circuit provides power for a telephone subscriber loop connected to a unit of terminal equipment. The power feed circuit includes a first current supply circuit for supplying power to the subscriber loop when the unit of terminal equipment is in an on-hook condition and when the unit of terminal equipment is in an off-hook condition, and a second current supply circuit for supplying power to the subscriber loop only when the unit of terminal equipment is in the off-hook condition. Each current supply circuit includes a respective battery, transistor and bias network. The first current supply circuit is connected to the subscriber loop via a diode which is reverse-biased when the unit of terminal equipment is in the on-hook condition. The power feed circuit may be usefully applied in an Optical Network Unit (ONU) of a "fiber-in-the-loop" telephone system or in a Subscriber-Cable Interface Unit (SCIU) of a cable telephony system.
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申请公布号 |
CA2271191(A1) |
申请公布日期 |
1999.11.08 |
申请号 |
CA19992271191 |
申请日期 |
1999.05.06 |
申请人 |
BELL ATLANTIC CORPORATION |
发明人 |
ORTEL, WILLIAM C. G. |
分类号 |
H04M19/00;(IPC1-7):H04M19/00 |
主分类号 |
H04M19/00 |
代理机构 |
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