EP0459756A2
Expired / Lapsed
EP
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Fiber distributed data interface network
Assignee: Advanced Micro Devices Inc
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Filing: 1991-05-28
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Granted: —
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Expires: 2011-05-28
Abstract
Abstract The standard FDDI priority algorithm is implemented by programming Token Holding Time (THT) threshold values for asynchronous service either in an increasing or decreasing order as a function of token holding time. If the thresholds are programmed in a decreasing order, all higher priority data is sent to the network before any lower priority data is sent. If the thresholds are programmed in an increasing order, highest priority data is sent first, until the unexpired token holding time falls below the threshold value for that priority; the next lower priority level data then is transmitted, and so on. Accordingly, at least some data of all priority assignments pending for transmission are sent to the medium during each token capture.
Inventors
- 👤 Farzin Firoozmand
- 👤 Gururaj Singh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 14:12
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/42; H04L12/427; H04L12/433
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
195 words
For a Fiber Distributed Data Interface (FDDI) network having a plurality of processors, each including a system memory means for storing packets of data arranged in queues and having different transmit priorities, and an optical medium forming a digital data communication path among said processors, a network controller, comprising: first means implementing a timed token data protocol for accessing said optical medium when a token on the medium is held and for releasing the token following expiration of a predetermined token holding time (THT); a random access memory; and second means for configuring in said random access memory at least one logical FIFO for storing therein queued frames of data to be transmitted on said medium, said queued frames of data being assigned different values of THT thresholds, and means for setting the values of THT thresholds for said queues arbitrarily in an increasing or a decreasing order of priority; wherein said first means includes means responsive to receipt of the token for transmitting a queue of said framed packet data having the highest priority during the token holding time while an unexpired THT is above the THT threshold value for the queue being transmitted.
Claim 2
Dependent Claim
41 words
The network controller of claim 1, including register means for storing said THT threshold values, means for controlling said register means by one of said processors and comparator means for comparing the content of said register means with said unexpired THT.
Claim 3
Dependent Claim
173 words
For a Fiber Distributed Data Interface (FDDI) network having a plurality of processors, each including a system memory means for storing packets of data arranged in queues and having different transmit priorities, and an optical medium forming a digital data communication path among said processors, a network controller, comprising: first means implementing a timed token data protocol for accessing said optical medium when a token on the medium is held and for releasing the token following expiration of a predetermined token holding time (THT); and second means for storing asynchronous frames of data to be transmitted on said medium, said asynchronous frames of data being assigned different THT threshold values and for setting said THT threshold values arbitiarily in an increasing or a decreasing order of transmit priority; wherein said first means includes means responsive to receipt of the token for transmitting a queue of said framed packet data having the highest priority during the token holding time while an unexpired THT is above the THT threshold value for the queue being transmitted.
Claim 4
Dependent Claim
41 words
The network controller of claim 3, including register means for storing said THT threshold values, means for controlling said register means by one of said processors and comparator means for comparing the content of said register means with said unexpired THT.
Claim 5
Dependent Claim
152 words
In a Fiber Distributed Data Interface (FDDI) network having a plurality of processors, each including a system memory means for storing packets of data arranged in queues and having different transmit priorities, and an optical medium forming a digital data communication path among said processors, first means implementing a timed token data protocol for accessing said optical medium during a token capture, means for establishing a token holding time (THT), means for storing queued frames of data having different transmit priorities and THT threshold values, and means responsive to receipt of the token for transmitting on said medium one of said queues having the highest priority while the THT threshold value of the queue having the highest priority is less than an unexpired THT: an improvement, comprising means for setting THT threshold values of said queues arbitrarily in a decreasing or an increasing order of priority as a function of unexpired THT.
Claim 6
Independent Claim
155 words
A method of controlling transmission to an optical medium of asynchronous frames of data in a Fiber Distributed Data Interface (FDDI) network having a plurality of processors on the medium, each including a system memory for storing packets of data arranged in queues and having different transmit priorities, the method comprising the steps of: capturing a token on the medium; accessing said optical medium when a token on the medium is held and for releasing the token following expiration of a predetermined token holding time (THT); storing in a random access memory queued frames of data having assigned thereto different THT threshold values; setting said THT threshold values for said queues arbitrarily in an increasing or a decreasing order of priority; and during receipt of the token, transmitting a queue of said framed packet data during the token holding time when an unexpired THT is above the THT threshold value for the queue being transmitted.
Claim 7
Dependent Claim
163 words
In method of transmitting asynchronous frames of data on a network optical medium in a Fiber Distributed Data Interface (FDDI) network having a plurality of processors on the network, each processor including a system memory for storing packets of data arranged in queues and having different transmit priorities, means for implementing a timed token data protocol for accessing said optical medium, means for storing therein queued frames of data having different transmit priorities and corresponding token holding time (THT) threshold values, and means responsive to receipt of the token for transmitting on said medium one of said queues having the highest priority while the value of THT threshold of the queue having the highest priority is less than an unexpired THT, an improvement comprising the step of setting priority time threshold values of said queues in a decreasing order of priority as a function of unexpired THT so that at least some frames of each priority pending are transmitted during every token capture.
References Cited (Backward Citations)
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