4. Multiplex communications
  5. Diagnostic testing
  6. Determination of communication parameters

David E. Massengill

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Telephonic communications – With usage measurement – Call charge metering or monitoring
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Telephonic communications – With usage measurement – Call charge metering or monitoring
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Backup logical port service

Electrical computers and digital processing systems: multicomput – Computer network managing
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Method and system for connecting a subscriber to an...

Telephonic communications – With usage measurement – Call charge metering or monitoring
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Method and system for connecting a subscriber to an...

Telephonic communications – With usage measurement – Call charge metering or monitoring
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