Relay device and data transmission method
A relay device and data transmission technology, applied in the direction of data exchange through path configuration, digital transmission system, data exchange network, etc., can solve the problems of additional, inability to eliminate delay jitter, and fluctuation of high-priority frame transmission delay time, etc. To achieve the effect of preventing delay jitter
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Embodiment approach 1
[0038] figure 1 It is a diagram showing a configuration example of the relay device 1 according to the first embodiment. The relay device 1 has a frame determination unit 2 , a fixed delay queue 3 , a low priority frame buffer 4 , a transmission frame selection unit 5 , a retransmission buffer 6 , and an output control unit 7 . In this embodiment, the low-priority frame storage means is constituted by the low-priority frame buffer 4 and the retransmission buffer 6 .
[0039]The frame judging unit 2 is a judging unit that assigns a high priority to each output port of a received frame using an identifier defined in a header or a payload of a received frame as a judgment criterion. frames and low priority frames. Here, the high-priority frame is a frame with a special priority, and the other frames are low-priority frames, which are frames with a lower priority than the high-priority frame.
[0040] The fixed-delay queue 3 is a high-priority queue that stores high-priority fr...
Embodiment approach 2
[0062] In Embodiment 1, the retransmission buffer 6 is provided separately from the low-priority frame buffer 4, but these are not necessarily provided independently. In Embodiment 2, a case where retransmission can be performed from a low-priority frame buffer will be described. In addition, the same code|symbol is attached|subjected to the same structure as Embodiment 1, and detailed description is abbreviate|omitted.
[0063] Figure 5 It is a figure which shows the structural example of the relay apparatus 1a concerning Embodiment 2. With respect to the relay device 1, in the relay device 1a, the retransmission buffer 6 is deleted, and the low-priority frame buffer 4, the transmission frame selection unit 5, and the output control unit 7 are replaced with low-priority frames Buffer 4a, transmission frame selection unit 5a, and output control unit 7a. In this embodiment, the low-priority frame buffer 4a is a low-priority frame storage unit.
[0064] The low-priority fra...
Embodiment approach 3
[0086] In Embodiments 1 and 2, the operation of the relay device having a two-port configuration was described, but as an example, the number of ports of the relay device is not limited. Therefore, for a relay device having three or more ports, the same structure as the relay device in Embodiments 1 and 2 is also feasible. In the case of a configuration with three or more ports, for input frames from a plurality of ports output from the frame determination unit 2 of the relay device according to Embodiments 1 and 2, it is necessary to make the frames of the same priority Transmissions are pre-processed in such a way that they do not conflict. In this embodiment, a description will be given of a collision control method for high-priority frames in a relay device having three or more ports. In addition, the same code|symbol is attached|subjected to the same structure as Embodiment 1, 2, and detailed description is abbreviate|omitted.
[0087] Figure 8 It is a figure which sh...
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