Patent US5706336A successfully refreshed from Google Patents.
US5706336A
Expired / Lapsed
US
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Telephone system circuitry for discriminating between voice and data transmissions
Assignee: PDACO Ltd
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Filing: 1995-10-26
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Granted: 1998-01-06
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Expires: 2015-10-26
Abstract
Abstract A selective call-waiting system for telephony use samples transmission on a busy line if the line subscribes to the selective call-waiting service, and avoids interrupting the transmission with a call-waiting signal if the transmission is data-type. If the transmission on the busy line subscribing to the selective call-waiting service is voice-type, the system sends a call-waiting signal. Signal analyzers are disclosed, as well as methods for practicing the invention.
Inventors
- 👤 Dan Kikinis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:40
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/428
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
A signal-analyzer plug-in card comprising: an interface adapted for connecting to a subscriber line interface circuit (SLIC); discrimination circuitry coupled to the interface and adapted for determining between voice signals and data signals in an ongoing established communication between two active terminals; and a digital communication port adapted for communication with a CPU; wherein the discrimination circuitry determines the voice or data nature of the established communication, and communicates the voice or data nature to the CPU via the digital communication port.
Claim 2
Dependent Claim
82 words
A signal-analyzer plug-in card comprising: an interface adapted for connecting to a subscriber line interface circuit (SLIC); discrimination circuitry coupled to the interface and adapted for determining between voice signals and data signals in an ongoing established communication between two active terminals; and a digital communication port adapted for communication with a CPU; wherein the discrimination circuitry determines the voice or data nature of the established communication, and communicates the voice or data nature to the CPU via the digital communication port.
Claim 3
Dependent Claim
90 words
A line card for a telephone switching system, comprising: a first interface for connecting the line card to a time-slot switch (TSS) and a second interface for connecting the line card to a subscriber line; and discrimination circuitry coupled to the second interface and adapted for determining between voice signals and data signals in an ongoing communication; wherein the line card is adapted to communicate with a CPU through the TSS to inform the CPU on command of voice or data nature of telephone signals carried by the line card.
Claim 4
Dependent Claim
90 words
A line card for a telephone switching system, comprising: a first interface for connecting the line card to a time-slot switch (TSS) and a second interface for connecting the line card to a subscriber line; and discrimination circuitry coupled to the second interface and adapted for determining between voice signals and data signals in an ongoing communication; wherein the line card is adapted to communicate with a CPU through the TSS to inform the CPU on command of voice or data nature of telephone signals carried by the line card.
Claim 5
Dependent Claim
89 words
A trunk card for a telephone switching system, comprising: a first interface for connecting the trunk card to a time-slot switch (TSS) and a second interface for connecting the trunk card to a trunk; and discrimination circuitry coupled to the second interface and adapted for determining between voice signals and data signals in an ongoing communication; wherein the trunk card is adapted to communicate with a CPU through the TSS to inform the CPU on command of voice or data nature of telephone signals carried by the trunk card.
Claim 6
Dependent Claim
89 words
A trunk card for a telephone switching system, comprising: a first interface for connecting the trunk card to a time-slot switch (TSS) and a second interface for connecting the trunk card to a trunk; and discrimination circuitry coupled to the second interface and adapted for determining between voice signals and data signals in an ongoing communication; wherein the trunk card is adapted to communicate with a CPU through the TSS to inform the CPU on command of voice or data nature of telephone signals carried by the trunk card.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-05 | 2001-07-07 | 2002-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-05 | 2005-07-07 | 2006-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-05 | 2009-07-07 | 2010-01-06 | $7700.00 | Window Closed / Lapsed |