Line/drop testing from a craft terminal using test unit

Details Line/drop testing from a craft terminal using test unit Line/drop testing from a craft terminal using test unit

1992-04-16

1994-11-01

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379 29, 379 30, 370 13, 370 16, H04M 124, H04M 322, H04J 116, H04J 314

Patent

active

053612930

ABSTRACT:
A subscriber equipment (210) is isolated (238, 234) at a line card (208) in a line shelf (200) and drop testing is conducted over a test-out bus (240) by a test unit (220) connected (236) to the subscriber equipment (210); the test unit (220) may be plugged into any line card slot in any of a plurality of line shelves (200, . . . , 202); if the test unit (220) is plugged into a line shelf (202) and it is desired to test subscriber equipment (210) in another line shelf (200), appropriate contacts (242 or 244) in test access units (246, 246a) in the corresponding line shelves (200, 202) are activated to provide access from the test unit in one (202) line shelf to the subscriber equipment connected into the other (200) line shelf; the test unit (220) may also be equipped with devices (211, 213) for conducting line testing over a cross-connect path created between the line under test and the test unit (220) wherein the line is terminated at the line shelf with terminations (TERMS) in the test access unit (246) to simulate the isolated subscriber equipment.

REFERENCES:
patent: 5027349 (1991-06-01), Thorne
patent: 5054056 (1991-10-01), Burke et al.
patent: 5060229 (1991-10-01), Tyrrell et al.
patent: 5063585 (1991-11-01), Shapiro
patent: 5111497 (1992-05-01), Bliven et al.
patent: 5195124 (1993-03-01), Ishioka
patent: 5208803 (1993-05-01), Conforti et al.
AT&T Bell Laboratories Technical Journal, vol. 63, No. 10, Part 2, Dec. 1984, pp. 2315-2318; 2373-2385.
Bellcore Technical Advisory TR-NWT-000909, Issue 1, Dec. 1991, Sections 2.9.8 and 11.4 (Testing).

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