Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Parameter related to the reproduction or fidelity of a...
Patent
1996-05-14
1998-05-12
Oda, Christine K.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Parameter related to the reproduction or fidelity of a...
324684, 324720, G01R 2728
Patent
active
057511527
ABSTRACT:
The apparatus includes a first transmitter for transmitting a first test signal from a first end of the cable and a second transmitter for transmitting a second test signal from a second end of the cable. The first test signal is transmitted on a first conductor pair at a first frequency and the second test signal is simultaneously transmitted on a second conductor pair at a second frequency. The apparatus also includes a first receiver for receiving a first coupled signal at the first end of the cable and a second receiver for simultaneously receiving a second coupled signal at the second end of the cable. The first coupled signal exhibits the first frequency and is received on a third conductor pair, while the second coupled signal exhibits the second frequency and is received on a fourth conductor pair. The transmit frequencies are offset such that interference and noise are not detected by the receivers as coupled signals.
REFERENCES:
patent: 2173183 (1939-09-01), Schramm
patent: 2264132 (1941-11-01), Flech, Jr.
patent: 2355776 (1944-08-01), Benning
patent: 5502391 (1996-03-01), Sciacero et al.
Nov. '95, Link Testing In The Time Domain And Performance Advantages Over Swept Frequency Measurements by J.S. Bottman Koeman.
Sep. '95, Transmission Performance Specifications for Field Testing of Unshielded Twisted-Pair Cabling Systems.
DuBose Richard G.
Teague Martin
Gresham Lowell W.
Meschkow Jordan M.
Microtest Inc.
Oda Christine K.
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