Pair gain test unit for use in a combined telephony/video co-axi

Details Pair gain test unit for use in a combined telephony/video co-axi Pair gain test unit for use in a combined telephony/video co-axi

1997-12-12

1999-08-31

Loomis, Paul

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379 32, 348192, H04M 124, H04N 1700

Patent

active

059463740

ABSTRACT:
A test system for performing pair gain tests within a co-axial cable termination unit of a combined telephony/video system is described. The combined telephony/video system provides a set of telephony channels and video channels to the co-axial cable termination unit over a single combined telephony/video transmission line. The co-axial cable termination unit includes interface circuitry in the form of modems, CODEC's, and the like, for interfacing the set of telephony channels provided on the combined telephony/video transmission line with a set of respective telephone lines connected into a subscriber location The interface circuitry also routes the video channel of the combined telephony/video transmission line onto a video-only co-axial cable also connected into the subscriber location. To accommodate pair gain testing, the co-axial cable termination unit also includes a pair gain test unit for verifying the operation of a single telephony channel provided on the combined telephony/video transmission line and a switch for connecting the pair gain test unit to a selected one of the set of telephone lines connected to the interface system to permit the test unit to test the telephony channel associated with the selected telephone line. In this manner only a single pair gain test unit is required within each co-axial cable termination unit.

REFERENCES:
patent: 4270030 (1981-05-01), Brolin et al.
patent: 5615225 (1997-03-01), Foster et al.
patent: 5774524 (1998-06-01), Yang
patent: 5818906 (1998-10-01), Grau et al.

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