Patent US4309613A successfully refreshed from Google Patents.
Patent US3821713A successfully refreshed from Google Patents.
US3821713A
Expired / Lapsed
US
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Multiple station receiver controlled transmission loop interface for data transfer and control between data processing systems and subsystems
Assignee: International Business Machines Corp
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Filing: 1972-12-29
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Granted: 1974-06-28
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Expires: 1992-12-29
Abstract
Abstract A communication mechanism in which subsystems are attached in a loop and communication between subsystems is accomplished in accordance with a demand-frame/response-frame discipline in which the receiving subsystem in the loop controls the frame generation mechanism with respect to another subsystem. A frame is the smallest unit of information transmitted between units attached to an interface between subsystems and may be used for data and/or control information. Frames are transmitted between subsystems over the interface in a bit-serial form. Each attached subsystem has a line adapter which 1) receives frames in parallel form from the unit''s frame logic and transmits the frames in a bit-serial form to the proper attached subsystem, and 2) receives the frames in a bit-serial form from other attached subsystems and transmits them in parallel form to the subsystem''s frame logic.
Inventors
- 👤 D Broadhurst
- 👤 B Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:20
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/38; G06F13/42; G06F13/4204; G06F13/4208; G06F13/4213
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
108 words
A multiple station receiver-driven communication system comprising: a sending subsystem; a receiving subsystem; means at said receiving subsystem for generating an empty frame and for inserting type bits into said frame to indicate that the frame is an empty frame or an idle frame; means at said receiving subsystem for monitoring frames and extracting data therefrom; transmission loop means connecting said generating means and said monitoring means; means at said sending subsystem connected in series with said loop means for passing said frames through said subsystem; and means associated with said last mentioned means for inserting data into said empty frame as it passes through said sending subsystem.
Claim 2
Dependent Claim
108 words
A multiple station receiver-driven communication system comprising: a sending subsystem; a receiving subsystem; means at said receiving subsystem for generating an empty frame and for inserting type bits into said frame to indicate that the frame is an empty frame or an idle frame; means at said receiving subsystem for monitoring frames and extracting data therefrom; transmission loop means connecting said generating means and said monitoring means; means at said sending subsystem connected in series with said loop means for passing said frames through said subsystem; and means associated with said last mentioned means for inserting data into said empty frame as it passes through said sending subsystem.
Claim 3
Dependent Claim
79 words
The combination according to claim 1 including an additional transmission loop and means at said sending subsystem for generating an empty frame and an idle frame in said additional loop and for monitoring frames; means at said receiving subsystem connected in series with said additional loop for passing said empty and idle frames through said receiving subsystem; and means associated with said last mentioned means for inserting data into said empty frame as it passes through said receiving subsystem.
Claim 4
Dependent Claim
50 words
The combination according to claim 2 wherein said empty frame generated in said transmission loop and said empty frame generated in said additional loop include a bit field therein in which an indicator may be inserted for correlating information generated in one loop with information generated in the other loop.
Claim 5
Dependent Claim
168 words
A serial demand response interface for communicating between first and second data processing subsystems comprising: means for transmitting data and control information on a first loop which comprises means in said first subsystem for generating a frame on said loop; means at said second subsystem in series with said first loop for passing said frame through said subsystem and for inserting data and/or control information into said frame; means at said first subsystem for receiving said frame and for extracting said data and/or control information therefrom; means at said second subsystem responsive to control information received on said first transmission loop for generating a frame on a second loop; means at said first subsystem in series with said second loop for receiving said frame on said second loop and for inserting data and/or control information therein and transmitting said frame back to said second subsystem; and means at said second subsystem for receiving said frame on said second loop and for extracting said data and/or control information therefrom.
Claim 6
Dependent Claim
168 words
A serial demand response interface for communicating between first and second data processing subsystems comprising: means for transmitting data and control information on a first loop which comprises means in said first subsystem for generating a frame on said loop; means at said second subsystem in series with said first loop for passing said frame through said subsystem and for inserting data and/or control information into said frame; means at said first subsystem for receiving said frame and for extracting said data and/or control information therefrom; means at said second subsystem responsive to control information received on said first transmission loop for generating a frame on a second loop; means at said first subsystem in series with said second loop for receiving said frame on said second loop and for inserting data and/or control information therein and transmitting said frame back to said second subsystem; and means at said second subsystem for receiving said frame on said second loop and for extracting said data and/or control information therefrom.
Claim 7
Dependent Claim
138 words
A serial demand-response interface for connecting a first subsystem and a second subsystem comprising: means in said first subsystem for generating a first frame over a first transmission loop to said second subsystem; means in said second subsystem for receiving said first frame and for inserting a demand-control function into said frame and for re-transmitting said frame to said first subsystem over said first loop; means at said first subsystem for receiving said first frame and for processing said demand; means in said second subsystem for generating a seconD frame over a second transmission loop to said first subsystem; and means in said first subsystem for receiving said second frame and for inserting a response-control function, related to said processed demand-control function, into said frame and for re-transmitting said frame to said second subsystem over said second loop.
Claim 8
Dependent Claim
138 words
A serial demand-response interface for connecting a first subsystem and a second subsystem comprising: means in said first subsystem for generating a first frame over a first transmission loop to said second subsystem; means in said second subsystem for receiving said first frame and for inserting a demand-control function into said frame and for re-transmitting said frame to said first subsystem over said first loop; means at said first subsystem for receiving said first frame and for processing said demand; means in said second subsystem for generating a seconD frame over a second transmission loop to said first subsystem; and means in said first subsystem for receiving said second frame and for inserting a response-control function, related to said processed demand-control function, into said frame and for re-transmitting said frame to said second subsystem over said second loop.
Claim 9
Dependent Claim
33 words
The combination according to claim 5 wherein said means for inserting a demand-control function includes means for inserting identification information into said first frame for correlating said first frame with said second frame.
Claim 10
Dependent Claim
65 words
A serial demand response interface for communicating between a first subsystem and a second subsystem comprising: a first transmission loop driven by said first subsystem; a second transmission loop driven by said second subsystem; means at said first subsystem for inserting control information and/or data in said second loop; and means at said second subsystem for inserting control information and/or data in said first loop.
Claim 11
Dependent Claim
65 words
A serial demand response interface for communicating between a first subsystem and a second subsystem comprising: a first transmission loop driven by said first subsystem; a second transmission loop driven by said second subsystem; means at said first subsystem for inserting control information and/or data in said second loop; and means at said second subsystem for inserting control information and/or data in said first loop.
Claim 12
Dependent Claim
34 words
The combination according to claim 7 wherein said means for inserting control information includes means for inserting identification information for correlating said information in said first loop with said information in said second loop.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |