There are many things worth learning about Ethernet switches. Here we mainly introduce how to avoid packet loss in Gigabit Ethernet switch energy data control. Flow control cannot improve the data throughput of the entire switch, but it avoids packet loss in the switch. The Gigabit Ethernet physical layer protocol IEEE defines several Gigabit Ethernet interfaces for different physical media, including 1000Base-CX, 1000Base-SX, 1000Base-LX, and 1000Base-T.
Among them, 1000Base-CX is an interface used on 155Ω balanced coaxial cables. There is no real product in practice. 1000Base-T is an interface that can be used for category 5 or higher twisted pair cables. Its standard is IEEE802.3ab. This standard was just released in June 1999, and now commercial products have just been launched in the market.
1000Base-SX uses 850nm wavelength laser interface, which is only suitable for multimode fiber. 1000Base-LX uses a 1300nm wavelength laser interface, which is suitable for single-mode and multi-mode fibers. 1000Base-SX is mainly used for campus network and enterprise network backbone.
1000Base-LX is mainly used in metropolitan area networks. Now another widely used metropolitan area network is the long-distance Gigabit Ethernet switch optical interface of 1000Base-LH. Generally, lasers with wavelengths of 1300nm or 1550nm are used, which can reach more than 50km. Even 100km of non-relay transmission distance.
It needs to be pointed out that, because the IEEE provides the Gigabit Ethernet transmission distance under the worst transmission conditions, in actual applications, the transmission distance of the products of various manufacturers far exceeds the standard provisions, such as Alcatel’s PowerRail 1000 The 1000Base-LX interface of the mega routing switch can transmit 22km without relay in the actual test.
Gigabit Ethernet switch efficiency The efficiency of
half-duplex Gigabit Ethernet switches has always been its weakness. After the number of workstations (such as computers) in a half-duplex Ethernet increases to a certain threshold, although each workstation Data is sent at a rate of 10Mbps, but due to the increase in conflicts, each workstation has to wait a long time before it is possible to send data, so the average available bandwidth for each workstation drops sharply.
In full-duplex switched Ethernet, the CD collision detection mechanism in the CSMA/CD protocol is no longer needed, and each workstation can get exclusive bandwidth. Therefore, the efficiency of full-duplex switched Ethernet no longer depends on the number of workstations in the network, but by the length of the Ethernet frame.
Reliability of Gigabit Ethernet Switch
In the traditional sense, Ethernet is regarded as a local area network (LAN) technology, which is widely used in enterprise networks. Therefore, the reliability of Gigabit Ethernet switches and Ethernet has not been affected. Consider it as the most critical factor.
With the maturity of switched full-duplex Fast Ethernet and Gigabit Ethernet switches, more and more operators choose Gigabit Ethernet as the preferred technology of metropolitan area network MAN. At this time, the reliability of Gigabit Ethernet switches It has become a key factor considered by operators.
To realize a reliable metropolitan area network with Gigabit Ethernet switches, there are now two mature technologies: Gigabit Ethernet port aggregation; Gigabit Ethernet 1+1 backup.
If Gigabit Ethernet switches are used to carry IP services, at the network layer IP level, ring or mesh network topologies can also be adopted, and IP routing protocols can be used to ensure network reliability.
Well, the above content is the analysis of Gigabit Ethernet switch failure and packet loss by Feichang Technology, I hope it can be helpful to everyone! Feichang Technology, a professional manufacturer of optical transceivers, optical fiber transceivers, industrial switches, and protocol converters, independently researches and develops brands, welcome to come to understand and communicate.
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