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Local loop test arrangement in an echo canceller based full dupl

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of hybrid or echo suppressor or canceller
Patent

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Local/remote modification of electronically alterable operating

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

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Localization of customer premises in a local loop based on...

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

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Lockout device for preventing telephone eavesdropping from an ex

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

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Long-distance transmission system and device

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

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Loop certification and measurement for ADSL

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

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Loop certification and measurement for ADSL

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

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Loop detection signal issuing circuit in subscriber circuit havi

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

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Loop integrity test device and method for digital subscriber...

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

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Loop loss measurement and reporting mechanism for digital...

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

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Loop loss measurement and reporting mechanism for digital...

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

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Loop status verification system

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

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Loop status verification system

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

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Loop test apparatus and method

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

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Loop-back test system using a suppressed ringing connection

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

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Low power control apparatus for a coin operated telephone

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

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