EP0064818A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Data collision avoidance method
Assignee: Pitney Bowes Inc
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Filing: 1982-04-16
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Granted: —
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Expires: 2002-04-16
Abstract
Abstract A method for communicating among at least two data processing stations (50, 58) connected by a network. The method comprises the steps of continuously monitoring a communications medium (52) to detect the presence of data transfer, generating a random number, and transmitting data over the communications medium (52) after a length of time which is dependent on the random number from the time at which the absence of data transfer over the medium is detected. The probability of simultaneous data transmission by two or more data processing stations (50, 58) over the communications medium (52) is thereby greatly reduced.
Inventors
- 👤 Robert Arthur Couper
- 👤 Terrance Lynn Lillie
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 23:25
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/14; G06F13/36; G06F13/368; G06F13/376; H; H04; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/407; H04L12/413
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
81 words
A method for communicating among at least two data processing stations (50, 58) connected by a net work, characterised in that it comprises the steps of a) continuously monitoring a communications medium (52) to detect the presence of data transfer thereover; b) generating a random number; and c) transmitting data over said communications medium (52) after a length of time dependent on said random number from the time at which the absence of data transfer over said communications medium is detected.
Claim 2
Independent Claim
81 words
A method for communicating among at least two data processing stations (50, 58) connected by a net work, characterised in that it comprises the steps of a) continuously monitoring a communications medium (52) to detect the presence of data transfer thereover; b) generating a random number; and c) transmitting data over said communications medium (52) after a length of time dependent on said random number from the time at which the absence of data transfer over said communications medium is detected.
Claim 3
Dependent Claim
41 words
A method for communicating in accordance with claim 1 characterised in that said random number is generated so that the probability of simultaneous data transmission by two or more data processing stations (50, 58) over said medium (52) is greatly reduced.
Claim 4
Independent Claim
99 words
A method for communicating among at least two data processing stations (50, 58) connected by a network, characterised in that it comprises the steps of: a) continuously monitoring a communications medium (52) to detect the presence of data transfer thereover; b) generating a random number; c) transmitting data over said communications medium (52) after a length of time dependent on said random number from the time at which the absence of data transfer over said communications medium (52) is detected; and d) generating an acknowledgement signal when the data transferred over said communications medium (52) has been successfully received.
Claim 5
Independent Claim
99 words
A method for communicating among at least two data processing stations (50, 58) connected by a network, characterised in that it comprises the steps of: a) continuously monitoring a communications medium (52) to detect the presence of data transfer thereover; b) generating a random number; c) transmitting data over said communications medium (52) after a length of time dependent on said random number from the time at which the absence of data transfer over said communications medium (52) is detected; and d) generating an acknowledgement signal when the data transferred over said communications medium (52) has been successfully received.
Claim 6
Independent Claim
117 words
A method for communicating among at least two data processing stations (50, 58) connected by a network, characterised it that it comprises the steps of: a) continuously monitoring a communications medium (52) to detect the presence of data transfer thereover; b) generating a random number; c) transmitting data over said communications medium (52) after a length of time dependent on said random number from the time at which the absence of data transfer over said communications medium (52) is detected; d) generating an acknowledgement signal when the data transferred over said communications medium has been successfully received; and e) retransmitting said data over said communications medium when said acknowledgement signal is not received within a predetermined time.
Claim 7
Independent Claim
117 words
A method for communicating among at least two data processing stations (50, 58) connected by a network, characterised it that it comprises the steps of: a) continuously monitoring a communications medium (52) to detect the presence of data transfer thereover; b) generating a random number; c) transmitting data over said communications medium (52) after a length of time dependent on said random number from the time at which the absence of data transfer over said communications medium (52) is detected; d) generating an acknowledgement signal when the data transferred over said communications medium has been successfully received; and e) retransmitting said data over said communications medium when said acknowledgement signal is not received within a predetermined time.
Claim 8
Dependent Claim
30 words
The method of communicating in accordance with claim 4 wherein the step of transmitting data over said communications medium occurs after said communications medium is determined to be available therefor.
Claim 9
Dependent Claim
36 words
A method of communicating in accordance with claim 1 or 2 characterised in that it comprises the step of generating an acknowledgement signal when the data transferred over said communications medium (52) has been successfully received.
Claim 10
Dependent Claim
35 words
A method of communicating in accordance with claim 6 characterised in that it comprises the step of retransmitting said data over said communications medium when said acknowledgement signal is not received within a predetermined time.
Claim 11
Dependent Claim
30 words
A method of communicating in accordance with claim 7 wherein the step of transmitting data over said communications medium occurs after said communications medium is determined to be available therefor.
References Cited (Backward Citations)
DE2249670A1
Cited
GB2006491A
Cited
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