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Method for the detection of impedances and for the...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
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Method of detecting remote ground condition

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
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Method of detecting remote ground condition

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
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Method of determining the physical length of a telephone line

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

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Methods for detecting defective communications lines

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
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Metrics-related testing of an operational support system...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
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Multiline transmission line test receptacle with provision for t

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
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Network interface device with disconnectable half-ringer

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
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Nonintrusive speech level and dynamic noise measurements

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
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Open power loop detector for transmission line elements

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
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Priority auto-control method of signal routes in No. 7...

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

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
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Public modular-telephone management system

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
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Remote test telephone line access system

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
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Remote testing of a trunk leading to an automatic call distribut

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

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Remotely operable telecommunications conductor test circuit...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
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Simultaneous tracing of multiple phone/data cables

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
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State monitoring method and apparatus in subscriber line test

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

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
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Subscriber line validation of a telephone network

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