US4574375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interface arrangement for a telephone system or the like
Assignee: Nortel Networks Ltd
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Filing: 1983-10-12
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Granted: 1986-03-04
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Expires: 2003-10-12
Abstract
Abstract An interface scheme is described which allows relatively convenient interconnection of, and re-configuration of, circuits for performing operations to digital signals from a bus. In one exemplary embodiment, a parallel bus, eight bits wide, having 320 channels per frame is provided. For each circuit to be connected to the parallel bus a connection memory and an input/output buffer is provided to control the accessing of the parallel bus by each circuit.
Inventors
- 👤 Michael F. Kemp
- 👤 Claude J. Champagne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:53
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/08; H04J3/18; H04Q; H04Q11/00; H04Q11/04; H04Q11/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
154 words
An interface means for applying information from a channel of a first digital bus to at least one processing circuit and for returning said information, after processing, to a respective channel, said means characterized by: a serial to parallel converter means for transforming the digital data on said first bus to parallel digital data on a second digital bus; a plurality of circuit means for selectively accessing said second bus, each said circuit means under the control of a respective connection memory means; each said connection memory means responsive to timing signals for controlling the access of an associated circuit means to said second bus such that said associated circuit means accesses said second bus at the appropriate time to receive the digital information from a selected channel on said second bus, and also accesses said bus at the appropriate time to transmit the digital information to a selected channel on said second bus.
Claim 2
Dependent Claim
154 words
An interface means for applying information from a channel of a first digital bus to at least one processing circuit and for returning said information, after processing, to a respective channel, said means characterized by: a serial to parallel converter means for transforming the digital data on said first bus to parallel digital data on a second digital bus; a plurality of circuit means for selectively accessing said second bus, each said circuit means under the control of a respective connection memory means; each said connection memory means responsive to timing signals for controlling the access of an associated circuit means to said second bus such that said associated circuit means accesses said second bus at the appropriate time to receive the digital information from a selected channel on said second bus, and also accesses said bus at the appropriate time to transmit the digital information to a selected channel on said second bus.
Claim 3
Dependent Claim
38 words
The interface means of claim 1 wherein said second bus comprises two parallel buses, each n bits wide, which can function both as two parallel buses, each n bits wide, or as one parallel bus, 2n bits wide.
Claim 4
Dependent Claim
169 words
An interface means for applying information from a channel of a serial digital bus to at least one processing circuit and for returning said information, after processing, to a respective channel, said means characterized by: serial to parallel converter means for transforming the serial bits from said serial bus to parallel bits on a parallel digital bus; a plurality of circuit means for selectively accessing said parallel bus, each said circuit means under the control of a respective connection memory means; each said connection memory means responsive to timing signals for controlling the access of an associated circuit means to said parallel bus such that said associated circuit means accesses said parallel bus at the appropriate time to receive the digital information from a selected channel on said parallel bus, corresponding to said channel on said serial bus, and also accesses said parallel bus at the appropriate time to transmit the digital information to a selected channel on said parallel bus, corresponding to said channel on said serial bus.
Claim 5
Dependent Claim
169 words
An interface means for applying information from a channel of a serial digital bus to at least one processing circuit and for returning said information, after processing, to a respective channel, said means characterized by: serial to parallel converter means for transforming the serial bits from said serial bus to parallel bits on a parallel digital bus; a plurality of circuit means for selectively accessing said parallel bus, each said circuit means under the control of a respective connection memory means; each said connection memory means responsive to timing signals for controlling the access of an associated circuit means to said parallel bus such that said associated circuit means accesses said parallel bus at the appropriate time to receive the digital information from a selected channel on said parallel bus, corresponding to said channel on said serial bus, and also accesses said parallel bus at the appropriate time to transmit the digital information to a selected channel on said parallel bus, corresponding to said channel on said serial bus.
Claim 6
Dependent Claim
31 words
The interface means of claim 3 further including a parallel to serial converter means for converting the digital information on said parallel bus to serial digital information on a serial bus.
Claim 7
Dependent Claim
22 words
The interface means of claim 3 wherein said serial to parallel converter means includes a connection memory and a data storage means.
Claim 8
Dependent Claim
38 words
The interface means of claim 4 wherein said parallel bus comprises 2n leads, n leads of which receive data from said serial to parallel converter means, and n leads carry data to said parallel to serial converter means.
References Cited (Backward Citations)
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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) | 1989-03-03 | 1989-09-02 | 1990-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-03 | 1993-09-02 | 1994-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-03 | 1997-09-02 | 1998-03-04 | $7700.00 | Window Closed / Lapsed |