US5163055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communications system using a fault tolerant protocol
Assignee: Telefonaktiebolaget LM Ericsson AB
•
Filing: 1990-06-27
•
Granted: 1992-11-10
•
Expires: 2010-06-27
Abstract
Abstract A system for the communication of data between digital devices uses a unique fault tolerant protocol wherein messages are exchanged in a format which allows for error detection and recovery, flow control and retransmissions. In the particular embodiment described, processors in a system for the recording and display of telephone traffic communicate using the aforementioned fault tolerant protocol.
Inventors
- 👤 Jangsik Lee
- 👤 Alexander Kasman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:56
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/0078; H04L1/0083; H04L1/12; H04L1/16; H04L1/1607; H04L1/1642; H04L9/00; H04L9/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
190 words
In a private branch exchange telephone system including a collection processor for the collection of data relating to telephone traffic in the system and a presentation processor for the graphical presentation of said data, a data communications system for controlling the transfer of said data from said collection processor to said presentation processor, said data communications system comprising: means for initially synchronizing the flow of messages between said collection processor and said presentation processor, said means for initially synchronizing residing in part at said collection processor and in part at said presentation processor; means for sending messages requesting specific data, said means for sending messages requesting specific data residing at said presentation processor; means for sending messages comprising data responsive to said messages requesting specific data, said means for sending messages comprising data responsive to said messages requesting specific data residing at said collection processor; means for checking that each of said messages comprising data responsive to said messages requesting data is correctly received, said means residing at said presentation processor; and wherein said messages are exchanged in a format allowing for error detection and recovery, flow control and retransmission
Claim 2
Dependent Claim
190 words
In a private branch exchange telephone system including a collection processor for the collection of data relating to telephone traffic in the system and a presentation processor for the graphical presentation of said data, a data communications system for controlling the transfer of said data from said collection processor to said presentation processor, said data communications system comprising: means for initially synchronizing the flow of messages between said collection processor and said presentation processor, said means for initially synchronizing residing in part at said collection processor and in part at said presentation processor; means for sending messages requesting specific data, said means for sending messages requesting specific data residing at said presentation processor; means for sending messages comprising data responsive to said messages requesting specific data, said means for sending messages comprising data responsive to said messages requesting specific data residing at said collection processor; means for checking that each of said messages comprising data responsive to said messages requesting data is correctly received, said means residing at said presentation processor; and wherein said messages are exchanged in a format allowing for error detection and recovery, flow control and retransmission
Claim 3
Dependent Claim
37 words
A data communications system according to claim 1 wherein said format comprises a packet of information in fields including: a header field; an overhead field; a message contents field; a verification field; and an end mark field.
Claim 4
Dependent Claim
43 words
A data communications system according to claim 1 wherein said synchronizing means comprises means for transmitting a start message residing at said presentation processor and means for transmitting an acknowledge start message in response to said start message residing at said collection processor.
Claim 5
Dependent Claim
38 words
A data communications system according to claim 1 wherein said checking means comprises means for transmitting an acknowledge message when a text message is correctly received, said means for transmitting an acknowledge message residing at said presentation processor.
Claim 6
Dependent Claim
141 words
In a system for the collection and presentation of telephone traffic, a method of communicating data between a collection processor and a presentation processor using messages configured according to a message format which allows for error detection and recovery, flow control and retransmissions, said method comprising the steps of: transmitting a start message from said presentation processor to said collection processor to initiate communication; transmitting an acknowledge start message from said collection processor to said presentation processor in response to said start message; transmitting messages containing data processing request signals from said presentation processor to said collection processor following the receipt of said acknowledge start message; transmitting messages containing data corresponding to said data processing request signals from said collection processor to said presentation processor; and transmitting a terminate message from said presentation processor to said collection processor to terminate communication.
Claim 7
Dependent Claim
141 words
In a system for the collection and presentation of telephone traffic, a method of communicating data between a collection processor and a presentation processor using messages configured according to a message format which allows for error detection and recovery, flow control and retransmissions, said method comprising the steps of: transmitting a start message from said presentation processor to said collection processor to initiate communication; transmitting an acknowledge start message from said collection processor to said presentation processor in response to said start message; transmitting messages containing data processing request signals from said presentation processor to said collection processor following the receipt of said acknowledge start message; transmitting messages containing data corresponding to said data processing request signals from said collection processor to said presentation processor; and transmitting a terminate message from said presentation processor to said collection processor to terminate communication.
Claim 8
Dependent Claim
30 words
A method according to claim 5 further comprising the step of transmitting an acknowledge terminate message from said collection processor to said presentation processor in response to said terminate message.
Claim 9
Dependent Claim
29 words
A method according to claim 5 wherein said message format includes: a header field; an overhead field; a message contents field; a verification field; and an end mark field.
Claim 10
Dependent Claim
105 words
A method according to claim 5 wherein said message format includes: a start text byte having a value of "FF" hex; a message length byte which specifies the number of bytes following said message length byte; a message sequence number byte which identifies a particular message for purposes of retransmission; a message type byte which specifies the operational nature of said particular message; a variable number of message contents bytes, said variable number being dependent on the value of said message type byte; an exclusive OR sum byte used for error checking and correction; and an end text byte having a value of "FF" hex.
References Cited (Backward Citations)
US4432090A
Cited
US4422171A
Cited
US4584684A
Cited
US4584685A
Cited
US4712214A
Cited
US4908828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-10 | 1996-05-11 | 1996-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-10 | 2000-05-11 | 2000-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-10 | 2004-05-11 | 2004-11-10 | $7700.00 | Window Closed / Lapsed |