Analyze several important factors of Ethernet Switches

In the modern network design, the use of Ethernet switches can significantly improve the application performance of the entire user network, and now many household switches reach the speed of 100 Mbps, it can meet the needs of most users.

For this reason, domestic switches are increasingly favored by more network users. In addition to the advantages of speed, switch devices can provide more functions than traditional network sharing devices. As the competition in the switch market becomes increasingly fierce, the price of switch equipment is more acceptable to users. Currently, domestic switches have quickly replaced hubs and become the preferred product for users to build networks.

The difference between a vswitch and a hub is to further understand the difference between a vswitch and a hub: If we regard a hub as a built-in Ethernet bus, A household switch can be considered as a multi-bus-exchange matrix interconnection.

Technically, a vswitch attaches each port to a backplane bus with a high bandwidth (at least one order of magnitude higher than the port bandwidth) and connects it to a vswitch, encapsulation data packets thrown in by the port enter the home switch through the backplane bus. You can use both forward-through and store-and-forward methods to exchange data.

In addition, vswitches are more cost-effective. In the past, the high price of domestic switches was the main reason for us to choose a hub. With the development of exchange technology in recent years, the price of Ethernet switches has dropped sharply. To date, the price/performance ratio of switches far exceeds that of hubs.

The prices of household switches on the market range from RMB to RMB and RMB, and there are many brands. SOHO switches are a good choice for ordinary home users. SOHO switches are almost all-in-one desktop switches.

They are of different sizes, usually 5 ~ 8 10/100 Mbps adaptive ports. Compared with medium-and high-end switches, SOHO switches generally do not support network management and do not manage or set up them. The number of computers to access is very limited, but the price is very low, applicable to home networks in a simple network environment. Next, I will introduce some precautions for the purchase.

The port type usually has more ports. The higher the price of the switch, the more computers you can connect. For home users, it is sufficient to select five or eight SOHO switches. A vswitch generally has N RJ-45 ports and at least one UPLink port. In addition, you must pay attention to whether the port supports MDI/MDIX. With this function, you can automatically establish a line-order connection on the cascade switching device, without the need to manually configure the line-order.

The transmission rate of mainstream household switches is still 100 Mbps, which can basically meet the needs of families. Although the gigabit network technology has developed rapidly in recent years, it is not practical. In the market, it is still dominated by 10/100 Mbps adaptive switches. However, considering the needs of future network upgrades, you can choose 10/100/100/1000 Mbps adaptive or Mbps adaptive Gigabit Switch, but the price is high.

The price is undoubtedly the most important consideration for the majority of users when purchasing switches. Currently, the price of domestic switches suitable for household or small office networks is almost the same as the price of the Hub to be "obsolete, for example, the price of a 5-port 10/100 Mbps adaptive home switch is roughly 100 ~ Except for products other than 300 RMB ).

Generally, the more ports, the higher the speed, the higher the bandwidth, and the more powerful the network management function, the higher the price of switch products. Eight SOHO switches are enough for families. Brands in the domestic market, low-end switch products cover from foreign network giants such as 3Com to D-Link youxun Network), TP-Link, dingxing and many other domestic brands. When purchasing a household switch, pay attention to the brand awareness of the product supplier, user reputation, after-sales service and quality assurance of the product.

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The shell of the Shape SOHO switch is generally packed in plastic or iron case, with little price difference. The shape is usually small and Mini. You can choose according to your preferences, the full duplex of a switch means that the switch can receive data while sending data. The two are synchronized, as if we call each other and can hear the other party's voice while talking.

All current household switches support full duplex. The advantage of full duplex is low latency and high speed. When talking about full duplex, we can't help but mention another concept closely related to it, that is, "Half Duplex". The so-called half duplex means that only one action occurs in a period of time.

For example, a narrow road can only have one vehicle passing through. When there are two vehicles on the road, in this case, only one vehicle can pass first, wait for another vehicle to start again, and this example will illustrate the half-duplex principle. Early walkie talkie and early hub devices are half duplex products.

With the continuous advancement of technology, half duplex will gradually exit the historical stage. In a broad sense, there are two types of network switches: WAN switches and LAN switches. WAN switches are mainly used in the telecom field to provide basic communication platforms. LAN switches are used in local networks to connect terminal devices, such as PCs and network printers.

The transmission media and transmission speed can be divided into Ethernet switches, Fast Ethernet switches, Gigabit Ethernet switches, FDDI switches, ATM switches, and wildcard ring switches. Large-scale applications can be divided into enterprise-level switches, department-level switches, and working group switches.