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EP0328004A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Token ring transmission method

Assignee: Sumitomo Electric Industries Ltd
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Filing: 1989-02-04
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Granted: —
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Expires: 2009-02-04
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Abstract

Abstract In a token ring transmission method wherein a plurality of nodes are interconnected in a ring form by a transmission path through which information is sent in one direction, and a right-to-send in the transmission path is obtained by a sender node that holds a token to be sent to the transmission path, the improvement comprises the steps of: sending an identification information (aMK) specific to the sender node (A) from the sender node (A) to the downstream node (B) after information (a1, a2) including a source address was sent from the sender node (A) to the downstream node (B); sending the token from the sender node (A) to the downstream node (B) after the identification information (aMK) specific to the sender node (A) was sent; erasing the information (a1, a2) including a source address that has travelled round the ring-shaped transmission path (1) and returned to the sender node (A), without relaying the information (a1, a2) to the downstream node (B); and when the sender node (A) detected the specific identification information (aMK), stopping the erasing step.

Inventors

  • 👤 Yasushi C/O Osaka Works Kida

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-01 14:27
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/42; H04L12/427; H04L12/433

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 157 words
In a token ring transmission method wherein a plurality of nodes are interconnected in a ring form by a transmission path through which information is sent in one direction, and a right-to-send in said transmission path is obtained by a sender node that holds a token to be sent to said transmission path, the improvement comprising the steps of: sending an identification information specific to said sender node from said sender node to the downstream node after information including a source address was sent from said sender node to said downstream node; sending said token from said sender node to said downstream node after said identification information specific to said sender node was sent; erasing said information including a source address that have travelled round said ring-shaped transmission path and returned to said sender node, without relaying the information to said downstream node; and when said sender node detected said specific identification information, stopping said erasing step.
Claim 2
Dependent Claim 157 words
In a token ring transmission method wherein a plurality of nodes are interconnected in a ring form by a transmission path through which information is sent in one direction, and a right-to-send in said transmission path is obtained by a sender node that holds a token to be sent to said transmission path, the improvement comprising the steps of: sending an identification information specific to said sender node from said sender node to the downstream node after information including a source address was sent from said sender node to said downstream node; sending said token from said sender node to said downstream node after said identification information specific to said sender node was sent; erasing said information including a source address that have travelled round said ring-shaped transmission path and returned to said sender node, without relaying the information to said downstream node; and when said sender node detected said specific identification information, stopping said erasing step.
Claim 3
Dependent Claim 55 words
A token ring transmission method as set forth in claim 1, further comprising the steps of: detecting a transmission abnormality by said sender node; if said sender node detects said transmission abnormality, sending information indicating said abnormality; and if said sender node detects a token or said information indicating said abnormality, stopping said erasing step.
Claim 4
Dependent Claim 25 words
A token ring transmission method as set forth in claim 1 or 2, wherein said information including a source address comprises a piece of frame.
Claim 5
Dependent Claim 27 words
A token ring transmission method as set forth in claim 1 or 2, wherein said information including a source address comprises a plurality of pieces of frames.
Claim 6
Dependent Claim 35 words
A token ring transmission method as set forth in any of the preceding claims, wherein when said source address of said information is identical with an address of said sender node, the information is erased.

References Cited (Backward Citations)

EP0119003A2 Cited
DE3507582A1 Cited

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