LandOfFree - US Patents - Listing for Telephonic communications,Diagnostic testing, malfunction indication, or electrical...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...

Apparatus for monitoring telecommunication transmission

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of centralized switching system

Apparatus for providing redundant services path to customer...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of data transmission

Apparatus for range-testing cordless communication devices and m

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal

Apparatus for supervising an automatic call distribution telepho

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Using portable test set

Apparatus for telephone line checking

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Using portable test set

Apparatus for testing an asymmetric digital subscriber line

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of centralized switching system

Apparatus for testing and sparing linecard equipment in a teleco

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of data transmission

Apparatus for testing spare line circuits in a communication sys

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Using portable test set

Apparatus for testing telephone cables

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of centralized switching system

Apparatus for testing the line continuity of telephone switch eq

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of data transmission

Apparatus for the automatic in-circuit testing of subscriber lin

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal

Apparatus for use in isolating the cause of a dropped telecommun

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Monitoring

Apparatus for use with key telephone systems

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – For detection of eavesdropping device

Apparatus to prevent unauthorized use of telephone lines

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal

Arrangement for line-testing

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal

Arrangement for line-testing

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of centralized switching system

Arrangement for operating and maintaining a telecommunications s

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage

Audio interface for telecommunications test system

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line

Audio verification of digital subscriber line connection