Test system for detecting ISDN NT1-U interfaces

Multiplex communications – Diagnostic testing – Using oam cells

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379 29, 370524, H04B 1008

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active

056362021

ABSTRACT:
The invention is a test method for testing ISDN interfaces from a remote location. The test method of the invention applies predetermined energy signals to the tip and ring leads of the customer subscriber line in a prescribed sequence, delays 10 to 100 ms, and then makes measurements of the voltage across the tip and ring leads. The voltage measurements are compared to limit values identified from the NT1-U dc characteristic curve to determine pass/fail of the tested interface.

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M. E. Burke et al., "Channel and Drop Testing in the SLC(R) Series 5 Carrier Fiber-To-The-Home Feature", National Fiber Optics Engineers Conference, Apr. 4, 1991, pp. 1-7 & Figs. 1-5.
SLC(R) Series 5 Carriet System, AUA411 Channel and Drop Test Unit--5SPQAA3, AT&T Data Sheet, AT&T 363-005-275, Issue 2, Mar. 1994, pp. 1-4.

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