US4935923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simple adapter for multiplexing ISDN terminals
Assignee: NEC Corp
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Filing: 1988-12-13
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Granted: 1990-06-19
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Expires: 2008-12-13
Abstract
Abstract A simple adapter for multiplexing ISDN (Integrated Services Digital Network) terminals adapter for an ISDN basic subscriber access system is connected by a connector to a subscriber's point-to-multipoint bus. The adapter allows a greater number of terminal equipment (TE) to be connected to the point-to-multipoint bus via S/T interfaces. By checking the type, subaddress or the like of a call coming in through the adapter, the adapter is capable of limiting the kind of acceptable calls.
Inventors
- 👤 Tomoyoshi Shimizu
- 👤 Hiroshi Ikeda
- 👤 Hatsuho Murata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:57
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0435; H04Q11/0471; H04Q11/0442; H04Q2213/00; H04Q2213/097; H04Q2213/176; H04Q2213/204
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
306 words
An ISDN (Integrated Services Digital Network) terminal multiplexing simple adapter for an ISDN basic subscriber access system, comprising: a network termination (NT)-side layer 1 terminal circuit connected to an NT via an S interface bus; a plurality of ISDN terminal equipment (TE)-side layer 1 terminal circuits for terminating a plurality of S interface buses to which ISDN TEs are connected; a layer 1 activation control circuit for delivering an activation command to said NT-side layer 1 terminal circuit and all of said TE-side layer 1 terminal circuits in response to S interface bus activation information which may be fed from said NT-side layer 1 terminal circuit and said TE-side layer 1 terminal circuits; an NT-side D-channel signal transfer control circuit for buffering and controlling transmission and reception of a D-channel signal which is separated by said NT-side layer 1 terminal circuit; TE-side D-channel signal transfer control circuits each being associated with a respective one of said layer 1 terminal circuits for buffering and controlling transmission and reception of a D-channel signal which is separated by said TE-side layer 1 terminal circuit; a conflict control circuit for controlling conflicts of data which may be transferred from said TE-side D-channel signal transfer control circuits to said NT-side D-channel signal transfer control circuit; data transfer means for transferring data from said NT-side D-channel signal transfer control circuit to said TE-side D-channel signal transfer control circuits by a broadcast mode; a B-channel switching circuit for selectively connecting B channels of said NT-side layer 1 terminal circuit and B channels of said TE-side layer 1 terminal circuits; a monitoring circuit for monitoring the D-channel signal which is separated by said NT-side layer 1 terminal circuit; and a B-channel switching control circuit for controlling said B-channel switching circuit in response to a call control signal which is sensed by said monitoring circuit.
Claim 2
Dependent Claim
306 words
An ISDN (Integrated Services Digital Network) terminal multiplexing simple adapter for an ISDN basic subscriber access system, comprising: a network termination (NT)-side layer 1 terminal circuit connected to an NT via an S interface bus; a plurality of ISDN terminal equipment (TE)-side layer 1 terminal circuits for terminating a plurality of S interface buses to which ISDN TEs are connected; a layer 1 activation control circuit for delivering an activation command to said NT-side layer 1 terminal circuit and all of said TE-side layer 1 terminal circuits in response to S interface bus activation information which may be fed from said NT-side layer 1 terminal circuit and said TE-side layer 1 terminal circuits; an NT-side D-channel signal transfer control circuit for buffering and controlling transmission and reception of a D-channel signal which is separated by said NT-side layer 1 terminal circuit; TE-side D-channel signal transfer control circuits each being associated with a respective one of said layer 1 terminal circuits for buffering and controlling transmission and reception of a D-channel signal which is separated by said TE-side layer 1 terminal circuit; a conflict control circuit for controlling conflicts of data which may be transferred from said TE-side D-channel signal transfer control circuits to said NT-side D-channel signal transfer control circuit; data transfer means for transferring data from said NT-side D-channel signal transfer control circuit to said TE-side D-channel signal transfer control circuits by a broadcast mode; a B-channel switching circuit for selectively connecting B channels of said NT-side layer 1 terminal circuit and B channels of said TE-side layer 1 terminal circuits; a monitoring circuit for monitoring the D-channel signal which is separated by said NT-side layer 1 terminal circuit; and a B-channel switching control circuit for controlling said B-channel switching circuit in response to a call control signal which is sensed by said monitoring circuit.
Claim 3
Dependent Claim
398 words
An ISDN (Integrated Services Digital Network) terminal multiplexing simple adapter for an ISDN basic subscriber access system, comprising: a network termination (NT)-side layer 1 terminal circuit connected to an NT via an S interface bus; a plurality of ISDN terminal equipment (TE)-side layer 1 terminal circuits for terminating a plurality of S interface buses to which ISDN TEs are connected; a layer 1 activation control circuit for delivering an activation command to said NT-side layer 1 terminal circuit and all of said TE-side layer 1 terminal circuits in response to S interface bus activation information which may be fed from said NT-side layer 1 terminal circuit and said TE-side layer 1 terminal circuits; an NT-side D-channel signal transfer control circuit for buffering and controlling transmission and reception of a D-channel signal which is separated by said NT-side layer 1 terminal circuit; TE-side D-channel signal transfer control circuits each being associated with a respective one of said layer 1 terminal circuits for buffering and controlling transmission and reception of a D-channel signal which is separated by said TE-side layer 1 terminal circuit; a conflict control circuit for controlling conflicts of data which may be transferred from said TE-side D-channel signal transfer control circuits to said NT-side D-channel signal transfer control circuit; data transfer means for transferring data from said NT-side D-channel signal transfer control circuit to said TE-side D-channel signal transfer control circuits in a broadcast mode; a reception control circuit for designating a particular one of said TE-side S interface buses in response to a call received from an Integrated Services Digital Network and data setting means for setting data in said reception control circuit; data transfer means for identifying, among data transferred from said NT-side D-channel signal transfer control circuit to said TE-side D-channel signal transfer control circuits, a SETUP message from said Integrated Services Digital Network and transferring data only to any of said TE-side D-channel signal transfer control circuits which is allowed by said reception control circuit; a B-channel switching circuit for selectively connecting B-channels of said NT-side layer 1 terminal circuit and B-channels of said TE-side layer 1 terminal circuits; a monitoring circuit for monitoring the D-channel signal which is separated by said NT-side layer 1 terminal circuit; and a B-channel switching control circuit for controlling said B-channel switching circuit in response to a call control signal which is sensed by said monitoring circuit.
Claim 4
Dependent Claim
398 words
An ISDN (Integrated Services Digital Network) terminal multiplexing simple adapter for an ISDN basic subscriber access system, comprising: a network termination (NT)-side layer 1 terminal circuit connected to an NT via an S interface bus; a plurality of ISDN terminal equipment (TE)-side layer 1 terminal circuits for terminating a plurality of S interface buses to which ISDN TEs are connected; a layer 1 activation control circuit for delivering an activation command to said NT-side layer 1 terminal circuit and all of said TE-side layer 1 terminal circuits in response to S interface bus activation information which may be fed from said NT-side layer 1 terminal circuit and said TE-side layer 1 terminal circuits; an NT-side D-channel signal transfer control circuit for buffering and controlling transmission and reception of a D-channel signal which is separated by said NT-side layer 1 terminal circuit; TE-side D-channel signal transfer control circuits each being associated with a respective one of said layer 1 terminal circuits for buffering and controlling transmission and reception of a D-channel signal which is separated by said TE-side layer 1 terminal circuit; a conflict control circuit for controlling conflicts of data which may be transferred from said TE-side D-channel signal transfer control circuits to said NT-side D-channel signal transfer control circuit; data transfer means for transferring data from said NT-side D-channel signal transfer control circuit to said TE-side D-channel signal transfer control circuits in a broadcast mode; a reception control circuit for designating a particular one of said TE-side S interface buses in response to a call received from an Integrated Services Digital Network and data setting means for setting data in said reception control circuit; data transfer means for identifying, among data transferred from said NT-side D-channel signal transfer control circuit to said TE-side D-channel signal transfer control circuits, a SETUP message from said Integrated Services Digital Network and transferring data only to any of said TE-side D-channel signal transfer control circuits which is allowed by said reception control circuit; a B-channel switching circuit for selectively connecting B-channels of said NT-side layer 1 terminal circuit and B-channels of said TE-side layer 1 terminal circuits; a monitoring circuit for monitoring the D-channel signal which is separated by said NT-side layer 1 terminal circuit; and a B-channel switching control circuit for controlling said B-channel switching circuit in response to a call control signal which is sensed by said monitoring circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |