Telephonic communications – Emergency or alarm communications – Personal monitoring
Reissue Patent
2003-02-12
2010-02-23
Tran, Quoc D (Department: 2614)
Telephonic communications
Emergency or alarm communications
Personal monitoring
C379S394000, C379S399010, C379S413020, C379S412000, C379S090010, C333S167000, C333S177000, C375S219000, C375S220000
Reissue Patent
active
RE041145
ABSTRACT:
An impedance blocking filter circuit is provided for use in telecommunication systems for interconnecting between incoming telephone lines and customer's terminal equipment so as to unconditionally block impedances abovedelete-start id="DEL-S-00001" date="20100223" ?20 KHzdelete-end id="DEL-S-00001" ?insert-start id="INS-S-00001" date="20100223" ?a desired frequency rangeinsert-end id="INS-S-00001" ?due to the customer's terminal equipment fromdelete-start id="DEL-S-00002" date="20100223" ?an ADSLdelete-end id="DEL-S-00002" ?insert-start id="INS-S-00002" date="20100223" ?a DSLinsert-end id="INS-S-00002" ?network unit and/or home networking interface unit.delete-start id="DEL-S-00003" date="20100223" ?The filter circuit includes first, second, and third inductors connected in series between a first input terminal and a first common point. A first resistor has its one end connected also to the first common point and its other end connected to a first output terminal. Fourth, fifth and sixth inductors are connected in series between a second input terminal and a second common point. A second resistor has its one end also connected to the second common point and its other end connected to a second output terminal. A capacitor has its ends connected across the first and second common points. In another aspect, the filter circuit also includes current limiting protection circuitry for reducing ring trip, dial pulse and off-hook transient current spikes.delete-end id="DEL-S-00003" ?insert-start id="INS-S-00003" date="20100223" ?In one exemplary embodiment, the filter circuit is adapted to block impedances above 20 KHz, and comprises a series of inductors disposed electrically between respective ones of first and second input terminals and output terminals. At least one capacitor and first and second resistors are also present in the circuit.insert-end id="INS-S-00003" ?
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Gazdzinski & Associates, PC
Pulse Engineering Inc.
Tran Quoc D
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