4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. Using portable test set

P. Kingston Duffle

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Battery injection and loop supervision for DSL environment

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

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Method and apparatus for generating an audible tone in DSL...

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

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Profile ID: LFUS-PAI-P-2084505

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