Voice frequency current used for digit selection

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CPC
H04Q2213/405

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HELECTRICITY H04Electric communication H04QSELECTING H04Q2213/00Indexing scheme relating to selecting arrangements in general and for multiplex systems

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H04Q2213/405Voice frequency current used for digit selection

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Patents Grantslast 30 patents

Information Patent Grant
Apparatus for interfacing analog telephone in ISDN terminal adapter
- Patent number 5,459,788
- Issue date Oct 17, 1995
- Samsung Electronics Co., Ltd.
- Ho-jun Kim
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Apparatus for providing an ISDN to analog interface
- Patent number 5,305,377
- Issue date Apr 19, 1994
- Sun Microsystems, Inc.
- Paul D'Arcy
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Simultaneous voice and data system using the existing two-wire inte...
- Patent number 5,214,650
- Issue date May 25, 1993
- AG Communication Systems Corporation
- Robert E. Renner
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents