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Class 2
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Class 2 is referred to as multiplex because it is a connectionless class of service with notification of delivery and nondelivery of frames. Since no dedicated connection needs to be established, a port can transmit frames to and receive frames from more than one N_Port. As a result, the N_Ports share the bandwidth of the links with other
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5 network traffic. Frames are not guaranteed to arrive in the order in which they were transmitted, except in the point-to-point or loop topologies. In addition, the media speeds may vary for different links that make up the path. Both buffer-to-buffer and end-to-end flow controls are used in class 2. Class 2 is more like typical LAN traffic, such as IP or File Transfer Protocol (FTP), where the order and timeliness of delivery are not so important. Connectionless, frame-switched transmission guarantees delivery and confirms receipt of traffic. Features include
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Functions that are performed on the data frame rather than on a connection No dedicated connection between N_Ports Each frame transmitted to its destination over any available route No guarantee of the order of delivery of frames Retransmittal of a frame when congestion occurs until the frame reaches its destination successfully
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In addition, when class 2 signaling blocks a frame, the transmitting N_Port receives a busy frame. This enables retransmission to be performed immediately rather than forcing the station to wait, as is the case with TCP/IP and other protocols.
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Class 3
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Class 3 is very similar to class 2. The only exception is that it only uses buffer-to-buffer flow control. It is referred to as a datagram service. Class 3 would be used when order and timeliness are not so important and when the ULP itself handles lost frames efficiently. Class 3 is the choice for SCSI and includes the following features:
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One-to-many connectionless, frame-switched service Class 2-like service but no delivery guarantee or confirmation mechanism
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Fibre Channel
Fibre Channel
Greater speed than class 2 because there is no wait for confirmation No retransmittal if a transmission does not arrive at its destination
Class 3 service is used most often for real-time broadcasts that cannot wait for acknowledgment but are not sufficiently time-critical to warrant class 1 service. It is also used for applications that can tolerate lost packets.
Class 4
Class 4 provides fractional bandwidth allocation of the resources of a path through a fabric that connects two N_Ports. Class 4 can be used only with the pure fabric topology. One N_Port will set up a virtual circuit (VC) by sending a request to the fabric indicating the remote N_Port as well as quality-of-service parameters. The resulting class 4 circuit will consist of two unidirectional VCs between the two N_Ports. The VCs need not be the same speed. Like a class 1 dedicated connection, class 4 circuits will guarantee that frames arrive in the order in which they were transmitted and will provide acknowledgement of delivered frames (class 4 end-toend credit). The main difference is that an N_Port may have more than one class 4 circuit, possibly with more than one other N_Port at the same time. In a class 1 connection, all resources are dedicated to the two N_Ports. In class 4, the resources are divided up into potentially many circuits. The fabric regulates traffic and manages buffer-to-buffer flow control for each VC separately using the FC_RDY primitive signal. Intermixing of class 2 and 3 frames is mandatory for devices supporting class 4.
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