Process and system evaluating deterministic behavior of a packet switching network
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G06F-015/16
G06F-015/173
G06F-011/00
출원번호
US-0717659
(2003-11-21)
등록번호
US-7395330
(2008-07-01)
우선권정보
FR-01 14261(2001-11-05)
발명자
/ 주소
Saint Etienne,Jean Francois
Lopez,Juan
Portes,Dominique
Gambardella,Eddie
Pasquier,Bruno
Almeida,Philippe
출원인 / 주소
Airbus France S.A.S.
대리인 / 주소
Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
인용정보
피인용 횟수 :
1인용 특허 :
1
초록▼
A process and system for evaluating the deterministic behavior of a packet switching network including subscriber stations connected to each other through at least one switch, the behavior defined as deterministic if any packet sent on the network from a source subscriber station joins the destinati
A process and system for evaluating the deterministic behavior of a packet switching network including subscriber stations connected to each other through at least one switch, the behavior defined as deterministic if any packet sent on the network from a source subscriber station joins the destination subscriber station(s) within a limited time. The process and system determines if each output port from each switch on the network satisfies the relationship: in which: the max latency value is a maximum residence time in an output buffer of a switch, this value may be different for each switch in the network, BAGi is a minimum time between two consecutive frames belonging to a virtual link i, before they are transmitted, (Jitter In) i is Jitter associated with a virtual link i that represents a time interval between a theoretical instant at which a frame is transmitted, and its effective transmission that may be before or after the theoretical instant, and (max frame duration) i is a duration of a longest frame on the virtual link i.
대표청구항▼
The invention claimed is: 1. A method for communication between subscriber stations via a packet switching network, said process comprising: evaluating deterministic behavior of the packet switching network, the behavior being defined as deterministic if any packet sent on the network from a source
The invention claimed is: 1. A method for communication between subscriber stations via a packet switching network, said process comprising: evaluating deterministic behavior of the packet switching network, the behavior being defined as deterministic if any packet sent on the network from a source subscriber station reaches a destination subscriber station within a duration that is limited in time, said evaluating comprising: determining a latency value, the latency value being a residence time in an output buffer of a switch, determining a max latency value, the max latency value being a maximum residence time in an output buffer of a switch, determining a BAGi value, the BAGi value being a minimum time between two consecutive frames belonging to a virtual link i, before they are transmitted, determining a (Jitter In)i value, wherein the (Jitter in)i is jitter associated with a virtual link i that represents a time interval between a theoretical instant at which a frame is transmitted, and its effective transmission that may be before or after the theoretical instant, determining a (max frame duration)i value, the (max frame duration)i value being a duration of a longest frame on the virtual link i, and determining for each output port from each switch on the network if the following relation is satisfied: wherein, if the relation is not satisfied, a user is notified that said packet switching network is not deterministic. 2. A method according to claim 1, further comprising adding the virtual links one by one, and the determining of each output port is performed after each addition of a virtual link. 3. A method according to claim 1, wherein the packet switching network is located on an aircraft. 4. A method according to claim 3, wherein the packet switching network includes a first switch connected to a first graphic screen and a second graphic screen. 5. A method according to claim 4, wherein the packet switching network includes a second switch connected to a flight parameters generator and an aircraft maintenance computer. 6. A method according to claim 5, wherein the first graphic screen displays flight parameters and the second graphic screen displays flight and maintenance parameters. 7. A method according to claim 1, wherein the jitter refers to max jitter. 8. A method according to claim 1, further comprising the step of aggregating a number of the virtual links without causing any loss of segregation. 9. A system for communication between subscriber stations via a packet switching network, said system configured to evaluate deterministic behavior of the packet switching network, the behavior being defined as deterministic if any packet sent on the network from a source subscriber station reaches a destination subscriber station within a duration that is limited in time, the system comprising: a latency value determining unit configured to determine a latency value; a max latency value determining unit configured to determine a max latency value; a BAGi value determining unit configured to determine a BAGi value; a (Jitter In)i value determining unit configured to determine a (Jitter In)i value; a (max frame duration)i value determining unit configured to determine a (max frame duration)i value; and a control unit configured to determine for each output port from each switch on the network if the following relation is satisfied: in which: the max latency value is a maximum residence time in an output buffer of a switch, the latency value is a residence time in an output buffer of a switch, BAGi is a minimum time between two consecutive frames belonging to a virtual link i, before they are transmitted, (Jitter In)i is jitter associated with a virtual link i that represents a time interval between a theoretical instant at which a frame is transmitted, and its effective transmission that may be before or after the theoretical instant, and (max frame duration)i is a duration of a longest frame on the virtual link i; and a user notification unit configured to notify a user that said packet switching network is not deterministic if the relation is not satisfied. 10. A system according to claim 9, in which the virtual links are added one by one, and the determining is performed after each addition of a virtual link. 11. A system according to claim 9, wherein the packet switching network is located on an aircraft. 12. A system according to claim 11, wherein the packet switching network includes a first switch connected to a first graphic screen and a second graphic screen. 13. A system according to claim 12, wherein the packet switching network includes a second switch connected to a flight parameters generator and an aircraft maintenance computer. 14. A system according to claim 13, wherein the first graphic screen displays flight parameters and the second graphic screen displays flight and maintenance parameters. 15. A press-method for communication between subscriber stations via a frame switching network, said process comprising: evaluating deterministic behavior of the packet switching network, the behavior being defined as deterministic if any packet sent on the network from a source subscriber station reaches a destination subscriber station within a duration that is limited in time, said evaluating including: determining a latency value, the latency value being a residence time in an output buffer of a switch, determining a max latency value, the max latency value being a maximum residence time in an output buffer of a switch, determining a BAGi value, the BAGi value being a minimum time between two consecutive frames belonging to a virtual link i, before they are transmitted, determining a (Jitter In)i value, wherein the (Jitter In)i is jitter associated with a virtual link i that represents a time interval between a theoretical instant at which a frame is transmitted, and its effective transmission that may be before or after the theoretical instant, determining a (max frame duration)i value, the (max frame duration)i value being a duration of a longest frame on the virtual link i, and determining for each output port from each switch on the network if the following relation is satisfied: and notifying a user, if the relation is not satisfied that said packet switching network is not deterministic. 16. A method according to claim 15, further comprising adding the virtual links one by one, and wherein the determining of each output port is performed after each addition of a virtual link. 17. A method according to claim 15, wherein the packet switching network is located on an aircraft. 18. A method according to claim 17, wherein the packet switching network includes a first switch connected to a first graphic screen and a second graphic screen. 19. A method according to claim 18, wherein the packet switching network includes a second switch connected to a flight parameters generator and an aircraft maintenance computer. 20. A method according to claim 19, wherein the first graphic screen displays flight parameters and the second graphic screen displays flight and maintenance parameters.
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이 특허에 인용된 특허 (1)
Honcik David B. ; Shetter Martin T., Reconfigurable algorithmic networks for aircraft data management.
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