Transfer Device Low-Latency Cut-Through Allocation
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Solution Overview
Problem
Conventional transfer devices require complex output control and numerous cut-through storage units to prioritize low-latency frames, leading to increased complexity and cost in implementing the IET low-latency transfer function.
Innovation Solution
A transfer device with an output-port decision unit, allocation unit, and IET-output control unit that allocates frames to either cut-through or store-and-forward pathways based on input port type and frame class, simplifying the control process and reducing the number of required cut-through storage units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If cut-through storage units as many as input ports for each output port are used to transfer low-latency frames, then low-latency transfer is achieved, but output control becomes complicated
Solution Approach 1:
The patent segments the transfer pathways into two distinct types: cut-through pathways for low-latency frames and store-and-forward pathways for general frames. This segmentation allows the system to handle different frame types through dedicated paths, reducing the complexity of output control while maintaining low-latency transfer capability for priority frames
Solution Approach 2:
Instead of having multiple cut-through storage units for each input-output port combination (which complicates control), the patent inverts the approach by using a single cut-through storage unit that receives frames from any input port and directs them to the appropriate output port. This inversion simplifies the control mechanism while achieving the same low-latency transfer objective
2Reliability
If cut-through storage units as many as input ports for each output port are used, then low-latency transfer function is realized, but device complexity and cost increase
Solution Approach 1:
The patent merges the functionality of multiple cut-through storage units (one for each input port) into a single shared cut-through storage unit. This unit receives low-latency frames from any input port and forwards them to the appropriate output port, thereby reducing the total number of storage units and associated circuitry while maintaining the low-latency transfer function
Solution Approach 2:
The single cut-through storage unit is designed to be universal, handling low-latency frames from any input port and directing them to any output port. This multi-functional design eliminates the need for dedicated cut-through storage units for each input-output pair, reducing device complexity and cost while preserving the low-latency transfer capability
Data Source
AI summary
A transfer device includes an output-port decision unit to decide, on the basis of storage information stored in a frame input, an output port from which the frame is output from among a plurality of ports, an allocation unit to associate an input port to which the frame is input with an output port from which a frame which is transferred by a cut-through method is output on a one-to-one basis, and allocate a first frame to a first pathway transferring by the cut-through method and allocate a second frame to a second pathway transferring by a store-and-forward method on the basis of type information of an input port to which a frame has been input, class information of the frame, and the output port decided by the output-port decision unit, and an IET-output control unit to output the first frame from the output port, decide whether to divide the second frame on the basis of the class information of the second frame, and output the second frame from the output port on the basis of decision. Therefore, the transfer device can realize an IET low-latency transfer function by control simpler than that in the conventional transfer devices.