Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent
1990-09-17
1992-05-05
Schreyer, Stafford D.
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of subscriber loop or terminal
379442, 379451, 379 29, 370 14, 361356, H04B 346, H04M 124, H04M 900, H01R 1344
Patent
active
051114976
ABSTRACT:
A test system directed to apparatus for transmitting and receiving multiple telephone transmission signals over a single twisted pair. The system converts an analog signal from a local switching station to an 80 ksymbols/sec signal for transmission over a twisted pair by a line card. A remote terminal converts the 80 ksymbols/sec signal back into a conventional analog signal for use in conventional telephone, facsimile or other related equipment. The test equipment separately tests the entire system, the line card portion of the system, the remote terminal portion of the system, and the twisted pair.
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Bliven David C.
Mullaney Julian S.
Shimirak Gerald L.
Vail Philip B.
Vranicar Anthony
Burkard Herbert G.
Norviel Vern
Raychem Corporation
Schreyer Stafford D.
Zavell A. Stephen
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