Summary of knowledge of various interfaces on network switches

The introduction of various types of switch interfaces that weak current workers may encounter in actual work. The interface of the switch is very rich, here are some collated information, ZR Cable will share with you.

1. RJ-45 interface

This interface is the most common network device interface we have now, commonly known as "crystal head", the professional term is RJ-45 connector, which belongs to the type of twisted pair Ethernet interface. The RJ-45 plug can only be inserted in a fixed direction, and there is a plastic shrapnel that is stuck with the RJ-45 slot to prevent it from falling off.

This interface can be used in 10Base-T Ethernet, 100Base-TX Ethernet, and 1000Base-TX Ethernet. The transmission medium is twisted pair, but there are different requirements for the medium according to the bandwidth, especially 1000Base- When TX Gigabit Ethernet is connected, at least Category 5e cable should be used, and Category 6 cable should be used to ensure stable and high speed.

2. SC fiber interface

The SC optical fiber interface has been applied in the era of 100Base-TX Ethernet, so it was called 100Base-FX at that time (F is the abbreviation of the fiber word fiber). It has not been popularized, and now the industry is vigorously promoting the Gigabit network, and the SC fiber interface has received renewed attention.

There are many types of optical fiber interfaces. The SC optical fiber interface is mainly used in the local network switching environment. This interface is provided on some high-performance gigabit switches and routers. It looks very similar to the RJ-45 interface, but the SC interface is flatter. , the obvious difference is the contacts inside. If it is 8 thin copper contacts, it is an RJ-45 interface, and if it is a copper column, it is an SC fiber interface.

3. AUI interface

The AUI interface is specially used to connect thick coaxial cables. In the early days, such an interface was connected to a hub and a switch to form a network, but it is generally not used now.

The AUI interface is a "D" type 15-pin interface, which was used in the token ring network or bus network before. It can be connected to the 10Base-T Ethernet network with the help of an external transceiver (AUI-to-RJ-45). Connection.

4. FDDI interface

FDDI is the one with the highest transmission rate among the mature LAN technologies at present. It has the characteristics of timing token protocol, supports multiple topological structures, and the transmission medium is optical fiber.

Fiber Distributed Data Interface (FDDI) is a set of protocols developed by the American National Standards Institute (ANSI) for sending digital signals over fiber optic cables. FDDI uses double-ring tokens, and the transmission rate can reach 100Mbps.

CCDI is a variant of FDDI, which uses twisted-pair copper cable as the transmission medium, and the data transmission rate is usually 100Mbps.

FDDI-2 is an extension protocol of FDDI, which supports voice, video and data transmission. It is another variant of FDDI, called FDDI full-duplex technology (FFDT). It adopts the same network structure as FDDI, but the transmission rate can reach 200Mbps. .

Because the use of optical fiber as the transmission medium has many advantages such as large capacity, long transmission distance, and strong anti-interference ability, it is often used in metropolitan area networks, backbone networks of campus environments, and multi-building network distribution environments. Therefore, FDDI interfaces are used in network backbone switches. It is more common on the Internet, and now with the popularity of Gigabit, some high-end Gigabit switches have also begun to use this interface.

5. Console interface

We know that this interface is used to configure the switch, so only managed switches have it. Also note that not all managed switches have it, because there are many ways to configure switches, such as Telnet command line, Web, TFTP, etc.

But it should be noted that the Console port used for switch configuration is not the same for all switches, and some use the same RJ-45 type Console port as Cisco routers.

ZR Cable focuses on the research and development and sales of optical fiber communication products. Optical communication products include standard product optical cables, optical fiber jumpers Cables, mpo/mtp data centers, optical fiber distribution frames, etc., at ZR Cable you can buy all optical communication products in one stop.