1756-IB16IF

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[]Westinghouse BR module[][] Rich supply and strong strength[]
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[] Programmable Controller +++++++++ Distributed control system []
The network card is equipped with a processor and memory (including R and R). Communication between the network card and the LAN is carried out through serial transmission through cables or twisted pairs. The communication between the network card and the computer is carried out in parallel transmission through the / bus on the computer motherboard. Therefore, an important function of the network card is to perform serial/parallel conversion. Since the data rate on the network is not the same as the data rate on the computer bus, a memory chip that caches the data must be installed in the network card.
When installing a network card, the device driver that manages the network card must be installed in the computer's operating system. This driver will later tell the network card where in the memory the data blocks transmitted from the LAN should be stored. The network card must also be able to implement the Ethernet protocol.
The network card is not an independent autonomous unit because the network card itself does not have a power supply but must use the power of the computer it is plugged into and is controlled by that computer. The network card can therefore be viewed as a semi-autonomous unit. When a network card receives an erroneous frame, it discards the frame without notifying the computer to which it is plugged. When the network card receives a correct frame, it uses an interrupt to notify the computer and deliver it to the network layer in the protocol stack. When the computer wants to send a data packet, it is handed down from the protocol stack to the network card, assembled into a frame, and sent to the LAN.
With the continuous improvement of integration, the number of chips on the network card continues to decrease. Although there are many types of network cards produced by various manufacturers, their functions are similar[].
Network performance can be improved with advanced network card options:
Effective use: Jumbo Frame Offload feature
If server performance is slow, it may be due to heavy network load. The standard Ethernet packet size is 1 byte, and most files are split into hundreds, thousands or even millions of packets or frames. These small data packets are transmitted through the network and share the network bandwidth with many nodes, but the sending and receiving of data frames will bring overhead.
Most network cards support jumbo frames, which means the ability to handle packets or frames up to bytes in size. Jumbo frames include more data in each packet, so the number of packets that need to be transmitted over the network becomes smaller. Increased throughput means that overhead packet headers and other packet content and overhead are reduced.
Controller
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