Method and apparatus for testing telecommunications equipment having both analog and digital interfaces
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United States of America Patent
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Sep 24, 1996
Grant Date -
N/A
app pub date -
Dec 22, 1994
filing date -
Dec 22, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A line interface circuit (12.sub.1) having a digital interface (18) and an analog interface (20) coupled to the digital interface by a transmission path (23, 26) may be tested by launching a digital value into the digital interface while the analog interface is terminated by termination impedance (35). The digital value launched into the line interface circuit is converted to an analog signal within the circuit which appears across the termination impedance, creating a voltage that is sensed back on the transmission path. This sensed voltage is convened within line interface circuit back to a digital value for output at the digital interface in response to the originally launched digital test value. The digital value generated at the digital interface of the line interface circuit in response to the test value is stored and processed by comparing the response to a reference value representing the proper operation of the line interface circuit, as derived by modeling the circuit and determining its response to conventional analog testing.
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