Service flow shaping method and device for cascaded port of avionics full duplex switched Ethernet (AFDX) switch

Abstract

The invention discloses a service flow shaping method and a service flow shaping device for a cascaded port of an avionics full duplex switched Ethernet (AFDX) switch. The main problems of relatively stronger switching delay jitter of packets and incapability of transmitting high-priority packets on time in the prior art are solved, and a system can be conveniently cascaded. The method comprises the following steps of: (1) extracting packet scheduling information; (2) extracting the information of a time registry; (3) receiving and scheduling the packets; (4) selecting and sequencing the packets; (5) updating time tags; (6) transmitting and scheduling the packets; and (7) updating a time registry. The device comprises an input caching module, a receiving scheduling module, a time registry module, a packet information storage area module, a time tag module, an output queue module, a transmission scheduling module and an output caching module. The method and the device have the advantages that: the determinacy of the delay jitter of the packets can be ensured; the forwarding delay jitter of the packets can be effectively reduced; the high-priority packets can be transmitted on time; and the method and the device are applied to the traffic shaping of the AFDX switch.

Description

technical field

[0001] The invention belongs to the technical field of communication, and further relates to a service flow shaping method and device for cascade ports of an aviation full duplex Ethernet (Avionics Full Duplex Switched Ethernet, AFDX) switch. The present invention can be used in traffic shaping, can reduce the delay jitter introduced by packet switching within the allowable delay range of the system, and ensure that high-priority packets are sent on time, which is convenient for system cascading. Background technique

[0002] In a packet data switch, the switching delay and the delay jitter usually need to be controlled below a certain value to meet the higher requirements of user services. In some special applications, the delay jitter introduced by packet forwarding through switches is not only required to be as small as possible, but also must be deterministic. With the development of aerospace technology, data switches will be used in aircrafts, spacecra...

Examples

Embodiment Construction

[0035] Attached below figure 1 , with figure 2 , the present invention is further described:

[0036] Reference attached figure 1 The device of the present invention includes eight modules: an input buffer module, a receiving scheduling module, a time registry module, a grouping information storage area module, a time label module, an output queue module, a sending scheduling module, and an output buffer module.

[0037] The input buffer module is used to receive and buffer data packets, and provide packet scheduling information for receiving scheduling, wherein the packet scheduling information includes: destination port, priority, multicast / unicast, and length, etc. The data packet enters the input buffer module, and the input The buffering module will buffer the packet in the input buffer, and at the same time extract useful packet scheduling information from the packet. The receiving scheduling module polls the input buffering module. If the input buffer is not empty, i...

technical field

[0001] The invention belongs to the technical field of communication, and further relates to a service flow shaping method and device for cascade ports of an aviation full duplex Ethernet (Avionics Full Duplex Switched Ethernet, AFDX) switch. The present invention can be used in traffic shaping, can reduce the delay jitter introduced by packet switching within the allowable delay range of the system, and ensure that high-priority packets are sent on time, which is convenient for system cascading. Background technique

[0002] In a packet data switch, the switching delay and the delay jitter usually need to be controlled below a certain value to meet the higher requirements of user services. In some special applications, the delay jitter introduced by packet forwarding through switches is not only required to be as small as possible, but also must be deterministic. With the development of aerospace technology, data switches will be used in aircrafts, spacecra...

Examples

Embodiment Construction

[0035] Attached below figure 1 , with figure 2 , the present invention is further described:

[0036] Reference attached figure 1 The device of the present invention includes eight modules: an input buffer module, a receiving scheduling module, a time registry module, a grouping information storage area module, a time label module, an output queue module, a sending scheduling module, and an output buffer module.

[0037] The input buffer module is used to receive and buffer data packets, and provide packet scheduling information for receiving scheduling, wherein the packet scheduling information includes: destination port, priority, multicast / unicast, and length, etc. The data packet enters the input buffer module, and the input The buffering module will buffer the packet in the input buffer, and at the same time extract useful packet scheduling information from the packet. The receiving scheduling module polls the input buffering module. If the input buffer is not empty, i...

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