Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of data transmission
Patent
1994-11-25
1996-07-23
Chin, Stephen
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Of data transmission
379 34, 379412, 361119, H04M 124, H02M 104
Patent
active
055398014
ABSTRACT:
The present invention provides a removable telephone line surge protection circuit (104) for use by an electronic deuce such as a modem (102). The line protection circuit (104) protects the modem (102) against telephone line surges such as those caused by lightning strikes. In one embodiment of the invention, the line protection circuit (104) interfaces with test circuitry which is preferably located within the modem (102) in order to allow the modem (102) to determine if the line protection circuit (104) is still operational while the line surge protection circuit (104) is connected to the modem (102). The present invention also provides for a removable surge protection circuit that is a testable module when connected to an electronic device having automatic module test capability as presented in one aspect of the invention. The surge protection circuit also provides for status indication of its operability in order to allow device users to make a quick determination of whether or not the module is damaged.
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Raychem PolySwith TR Series specification sheets, 2 pages, on PTC overcurrent protectors for telecommunications equipment, date not available.
Electrical Specifications, pp. 6-7, 14-15, Teccor Electronics, Inc., date not available.
Herh Ting
Hidalgo Adolfo J.
Hill Patrick D.
Ripy Paul B.
Steinman Sheldon
Chin Stephen
Hernandez Pedro P.
Loomis Paul
Racal-Datacom, Inc.
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