US5398246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
ISDN private local switching system
Assignee: NEC Corp
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Filing: 1993-05-14
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Granted: 1995-03-14
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Expires: 2013-05-14
Abstract
Abstract In a private branch exchange connected to an Integrated Services Digital Network, an ISDN user interface unit separates a signal from each user terminal into a B-channel packet and a D-channel packet and further separates the latter into a signaling message and a D-channel packet mode signal. The separated D-channel packet mode signal is multiplexed with D-channel packet mode signals from other user terminals into a D-channel packet mode multiplex signal and applied through a channel to an ISDN network interface unit, while the signaling message is applied to a controller for processing. In the ISDN network interface unit, the D-channel packet mode multiplex signal is multiplexed with the signaling message processed by the controller into an outgoing D-channel signal and transmitted with the B-channel packet to the ISDN.
Inventors
- 👤 Masahito Fujioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:26
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
347 words
A private local switching system connected to an Integrated Services Digital Network (ISDN) which supports B-channel and D-channel packet transmission rates, comprising: an ISDN user interface circuit connected to user terminals, each of said user terminals transmitting a signal comprising a B-channel packet and a D-channel packet, said D-channel packet comprising a signaling message and a D-channel packet mode signal, said ISDN user interface circuit comprising: a plurality of first separator means corresponding respectively with said user terminals, each of said first separator means separating the B-channel packet and the D-channel packet of a signal transmitted from said corresponding user terminal; second separator means, connected to receive D-channel packets from said plurality of said first separator means for separating the signaling message and the D-channel packet mode signal of each of said D-channel packets; first multiplexer means connected to receive the D-channel packet mode signal of each of said user terminals from said second separator means for multiplexing said D-channel packet mode signals from all of said user terminals into a D-channel packet mode multiplex signal; a controller connected to receive the signaling messages of each of said user terminals from said second separator means for processing said signaling messages and producing a control signal; switching means connected to receive B-channel packets from said plurality of first separator means for switching said B-channel packets and for switching individual components of said D-channel packet mode multiplex signal according to said control signal; and an ISDN network interface circuit comprising: second multiplexer means connected to receive said control signal for multiplexing said signaling messages from each of said first separator means processed by said controller with a corresponding one of said individual components of said D-channel packet mode multiplex signal received from said switching means into an outgoing D-channel signal; and means connected to receive said B-channel packets from said switching means for receiving a particular B-channel packet and said outgoing D-channel signal from said second multiplexer means corresponding to said particular B-channel packet and transmitting said particular B-channel packet with said received outgoing D-channel signal to said Network.
Claim 2
Dependent Claim
347 words
A private local switching system connected to an Integrated Services Digital Network (ISDN) which supports B-channel and D-channel packet transmission rates, comprising: an ISDN user interface circuit connected to user terminals, each of said user terminals transmitting a signal comprising a B-channel packet and a D-channel packet, said D-channel packet comprising a signaling message and a D-channel packet mode signal, said ISDN user interface circuit comprising: a plurality of first separator means corresponding respectively with said user terminals, each of said first separator means separating the B-channel packet and the D-channel packet of a signal transmitted from said corresponding user terminal; second separator means, connected to receive D-channel packets from said plurality of said first separator means for separating the signaling message and the D-channel packet mode signal of each of said D-channel packets; first multiplexer means connected to receive the D-channel packet mode signal of each of said user terminals from said second separator means for multiplexing said D-channel packet mode signals from all of said user terminals into a D-channel packet mode multiplex signal; a controller connected to receive the signaling messages of each of said user terminals from said second separator means for processing said signaling messages and producing a control signal; switching means connected to receive B-channel packets from said plurality of first separator means for switching said B-channel packets and for switching individual components of said D-channel packet mode multiplex signal according to said control signal; and an ISDN network interface circuit comprising: second multiplexer means connected to receive said control signal for multiplexing said signaling messages from each of said first separator means processed by said controller with a corresponding one of said individual components of said D-channel packet mode multiplex signal received from said switching means into an outgoing D-channel signal; and means connected to receive said B-channel packets from said switching means for receiving a particular B-channel packet and said outgoing D-channel signal from said second multiplexer means corresponding to said particular B-channel packet and transmitting said particular B-channel packet with said received outgoing D-channel signal to said Network.
Claim 3
Dependent Claim
107 words
A private local switching system as claimed in claim 1, wherein said ISDN network interface circuit further comprises: third separator means connected to receive said outgoing D-channel signal as an incoming D-channel signal for separating a D-channel packet into an incoming signaling message and an incoming D-channel packet mode signal and coupling said incoming signaling message to said controller and coupling said incoming D-channel packet mode signal to said switching means, wherein said ISDN user interface circuit further comprises demultiplexer means for receiving said incoming D-channel packet mode signal through said switching means and applying said incoming D-channel packet mode signal to one of said user terminals.
Claim 4
Dependent Claim
76 words
A private local switching system as claimed in claim 1, wherein each of said D-channel packets from said user terminals contains a Service Access Point Identifier (SAPI), and wherein said second separator means examines said SAPI of each of said D-channel packets from said plurality of said first separator means for separating said each of said D-channel packets into said signaling message and said D-channel packet mode signal according to a value of said examined SAPI.
Claim 5
Dependent Claim
73 words
A private local switching system as claimed in claim 2, wherein each of said D-channel packets from said user terminals contains a Service Access Point Identifier (SAPI), and wherein said third separator means examines said SAPI of each of the D-channel packets from said Network for separating said each of said D-channel packets into said incoming signaling message and said incoming D-channel packet mode signal according to a value of said examined SAPI.
Claim 6
Dependent Claim
42 words
A private local switching system as claimed in claim 1, wherein said ISDN user interface circuit further comprises address translation means for translating an address contained in said D-channel packet mode signal separated by said second separator means into a network address.
Claim 7
Dependent Claim
43 words
A private local switching system as claimed in claim 2, wherein said ISDN user interface circuit further comprises address translation means for translating an address contained in said incoming D-channel packet mode signal separated by said third separator means into a terminal address.
Claim 8
Dependent Claim
19 words
A private local switching system as claimed in claim 1, wherein said switching means comprises a time-slot interchanging means.
References Cited (Backward Citations)
US5278665A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-13 | 1998-09-12 | 1999-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-13 | 2002-09-12 | 2003-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-13 | 2006-09-12 | 2007-03-14 | $7700.00 | Window Closed / Lapsed |