H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 19/00 (2006.01) H04M 1/24 (2006.01) H04M 3/30 (2006.01)
Patent
CA 2126610
The potential impedance mismatch of digital terminal equipment and a line test unit conforming with the Bellcore standard of terminating the line with a 600 - 900 ohm impedance during data reception includes a controllably disabled AC impedance, operable to normally bridge the tip and ring leads of the telephone circuit under test with the required (600-900 ohm) impedance during data reception, under direct control by the craftsman's keypad or software control resident in the test set's microcontroller, to selectively remove the AC matching impedance that would otherwise bridge the line. The AC impedance is comprised of a D.C. blocking capacitor and a resistor coupled in series with a controllable solid state relay which is normally rendered conductive during data reception to bridge the tip and ring leads. By direct manual control from the craftsman's keypad, or software control resident in the test set's microcontroller, the control signal supplied by the microcontroller to the solid state relay may be removed, so as to selectively decouple the AC matching impedance that would otherwise bridge tip and ring leads of the telephone line during data reception.
Horton Michael D.
Parker Geoffrey H. Jr.
Fluke Corporation
Horton Michael D.
Oyen Wiggs Green & Mutala Llp
Parker Geoffrey H. Jr.
LandOfFree
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