Introduction to the interfaces of twisted pair RJ-45 switch and fiber switch

Introduction of twisted pair wire RJ-45 switch interface and fiber switch interface, fiber switch interface is often encountered, how to understand the interface type of fiber switch, what is the interface connection mode and so on, all of them will be fully resolved in this article.

In our impression, a switch is a network device connected to a LAN node. In fact, it also exists in the Wide Area Network and is widely used, especially in telecom operators, ATM switches and fiber-channel switches, which we can hardly see at ordinary times.

However, this article mainly uses our common LAN switches as an example to introduce the interfaces and Connection Methods of various optical fiber switches. As a centralized connection device for a LAN, a LAN switch's optical fiber switch interface type changes with the development of various LAN and transmission media types, analyze the main network types and transmission media development process of the LAN.

It is not difficult to find the Interface Types of various optical fiber switches. Next we will introduce some existing optical fiber switch interfaces. Note that because many optical fiber switch interfaces of the vswitch are the same as those of the router interface, therefore, the corresponding optical switch interface on the vro is introduced here.

Optical Switch Interface Type

Twisted Pair RJ-45 Interface

This is the most widely used fiber switch interface type we have seen. It belongs to the twisted pair Ethernet interface type. It is not only used in the most basic 10Base-T Ethernet network, but also in the mainstream 100Base-TX Fast Ethernet and 1000Base-TX Gigabit Ethernet.

Although the transmission media they use are of the twisted pair type, they use different versions of the twisted pair type, for example, for the first 10 BASE-T to 6 categories that support BASE-TX gigabit speed, the 100Base-TX in the middle uses the so-called five-category and cat-5e lines. Of course, it can also be six categories.

These RJ-45 fiber switch interfaces look exactly the same, as shown on the left of 1, like a flat "T. Connected with the RJ-45 crystal head, 2, the right figure respectively for a crystal head and do a good job of crystal head cable twisted pair. 2 is an Ethernet switch with 24-port RJ-45 interfaces, two SC Optical Switch interfaces and one AUI interface will be introduced below.

Although fiber-optic transmission media has already been used in the 100Base era, this G network was called "100Base-FX" to distinguish it from the widely used g twisted pair Ethernet 100Base-TX ", the "F" is the first letter of the Fiber "Fiber.

However, due to the current Mbit/s rate, compared with the traditional twisted pair Cable medium, the advantage is not obvious, and the price is much more expensive than that of twisted pair wires, so the fiber production in the Mbit/s era has not been widely used, it has been fully applied since the official implementation of 1000Base technology, because at this rate, although there are also twisted pair wires, the performance is far inferior to that of optical fibers, it has obvious advantages in connection distance and is very suitable for man and wan.

Optical Switch Interface

At present, the optical fiber transmission medium is developing rapidly, and various optical fiber switch interfaces are also research. However, in LAN switches, the optical fiber switch interfaces are mainly SC type, either in 100Base-FX or 1000Base-FX networks. The core of the SC interface is in the connector. Figure 3 on the left shows a SC optical fiber interface module of 100Base-FX network. The right figure shows an optical fiber switch that provides four SC optical fiber switch interfaces. As shown in figure 2, The vswitch also has two SC Optical Switch interfaces.

From figure 2 and Figure 3 right figure Switch SC interface appearance can be seen that it and RJ-45 interface is very similar, but SC interface seems more flat, the gap is lighter. Mainly look at the contact chip is what type, if it is 8 pieces of Copper shrapnel, It is the RJ-45 interface, and if it is a copper column inside is SC Fiber switch interface.

AUI interface and BNC

The AUI interface is specially used to connect coarse coaxial cables. Although this network is rare in Lan, in some large enterprise networks, there may still be some legacy coarse coaxial cable token network equipment, so some switches also retain a few AUI interfaces to meet user needs to a greater extent. The AUI interface is a 15-pin "D" interface, similar to the display interface. This interface is also seen in many network devices, such as routers and even servers. 4 shows the AUI interface on the routers.

BNC is an optical switch interface dedicated for connecting to a thin coaxial cable. Currently, vswitches that provide such an interface are rare. However, some RJ-45 Ethernet switches and hubs also provide a few BNC interfaces, specifically used to connect to a token network with a fine coaxial cable as a transport medium. In order to show you the true appearance of BNC, the BNC interface Nic is shown below, as shown in Figure 5.