Patent US4652874A successfully refreshed from Google Patents.
US4652874A
Expired / Lapsed
US
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Serial communication interface for a local network controller
Assignee: Motorola Solutions Inc
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Filing: 1984-12-24
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Granted: 1987-03-24
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Expires: 2004-12-24
Abstract
Abstract A serial communications interface for coupling a physical layer such as a modem to a media access control layer in a token bus network provides data and station management information therebetween on a plurality of bidirectional data lines providing management functions and a unique serial bus for control transfer in addition to communications data.
Inventors
- 👤 Bruce A. Loyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:42
CPC Classifications
H; H04; H04L; H04L49/00; H04L49/90; H04L49/9047; G; G06; G06F; G06F13/00; G06F13/10; G06F13/12; G06F13/124; G06F13/128; H04L12/00; H04L12/28; H04L12/40; H04L12/407; H04L12/417; H04L49/901
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
A local area network including a serial communications interface for coupling a physical layer to a media access control layer and providing data and station management information therebetween comprising: a first control line coupled to said physical layer having one of first and second signals thereon; a plurality of data lines interconnecting said physical and media access control layers, whereby said data information may be transferred on said data lines to said physical layer from said media access control layer when said first signal is present and said station management information may be transferred on said data lines to said physical layer from said media access control layer when said second signal is present.
Claim 2
Dependent Claim
114 words
A local area network including a serial communications interface for coupling a physical layer to a media access control layer and providing data and station management information therebetween comprising: a first control line coupled to said physical layer having one of first and second signals thereon; a plurality of data lines interconnecting said physical and media access control layers, whereby said data information may be transferred on said data lines to said physical layer from said media access control layer when said first signal is present and said station management information may be transferred on said data lines to said physical layer from said media access control layer when said second signal is present.
Claim 3
Dependent Claim
83 words
The local area network of claim 1 further comprising: a second control line coupled to said media access control layer having one of third and fourth signals thereon, whereby said data information may be transferred on said data lines to said media access control layer from said physical layer when said third signal is present and said station management information may be transferred on said data lines to said media access control layer from said physical layer when said fourth signal is present.
Claim 4
Dependent Claim
20 words
The local area network of claim 1 wherein said first control line is activatable by said media access control layer.
Claim 5
Dependent Claim
18 words
The local area network of claim 2 wherein said second control line is activatable by said physical layer.
Claim 6
Dependent Claim
13 words
The local area network of claim 1 wherein said data lines are bidirectional.
Claim 7
Dependent Claim
21 words
The local area network of claim 1 wherein said first and second signals are logic high and logic low levels respectively.
Claim 8
Dependent Claim
21 words
The local area network of claim 2 wherein said third and fourth signals are logic high and logic low levels respectively.
Claim 9
Dependent Claim
17 words
The local area network of claim 1 wherein said serial communications interface comprises a token bus controller.
Claim 10
Dependent Claim
16 words
The local area network of claim 8 wherein said token bus controller is an LSI circuit.
Claim 11
Dependent Claim
15 words
The local area network of claim 1 wherein said network is a token bus network.
Claim 12
Dependent Claim
14 words
The local area network of claim 1 wherein said physical layer comprises a modem.
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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) | 1990-03-23 | 1990-09-22 | 1991-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-23 | 1994-09-22 | 1995-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-23 | 1998-09-22 | 1999-03-24 | $7700.00 | Window Closed / Lapsed |