The purpose of the optical port (optical fiber interface) and the electrical port are the same, both are external communication interfaces and play a transmission role. To put it simply, it is just the difference in the transmission medium, the optical port is connected to the optical fiber, the electrical port is connected to the ordinary communication cable, the biggest difference is the optical port that requires high communication speed, and the electrical port that is not so high.

Optical port: An optical interface is a physical interface used to connect optical cables. The principle is the use of light from the optically dense medium into the optically phobic medium, resulting in total reflection. There are usually SC, ST, FC and other types, which are developed by the Japanese NTT company. FC is the abbreviation of Ferrule Connector, which is externally reinforced by a metal sleeve and tightened by a turnbuckle. The ST interface is usually used for 10Base-F, and the SC interface is usually used for 100Base-FX.

Electrical port: The electrical port is relative to the optical port, which refers to the physical characteristics of the flame preventer, mainly referring to copper cables, including ordinary network cables and RF coaxial cables, which are processed electrical signals. At present, the common network interfaces are 100 megabit electrical ports and gigabit electrical ports. In simple terms, the electrical port is an ordinary twisted Pair (Twirst Pair) interface, the general rate is 10M or 100M, and some support 1000M. The maximum distance of the electrical port is 100 meters. Optical cables transmit optical signals, while electrical cables transmit electrical signals, such as high (representing 1) and low (representing 0).

What is the difference between optical port and electrical port

1, the optical port is what we usually say with a light plate expansion slot can be inserted into the optical fiber for long-distance data transmission; The electrical port is the RJ45 port that we often say is the network cable port, and the switch with network management can carry out the functions of the switch and the management of the rights and online monitoring of the equipment status, and has the network login function. The non-network management type is the fool type to plug in the line directly, and generally only has the two-layer exchange function.

2, 155Mb/s below are electrical interfaces, 155Mb/s above are optical interfaces; 155Mb/s can be an electrical interface or an optical interface. The intra-office connection can be an electrical or optical interface. All inter-office connections are optical transmission; Secondly, the electrical signal is connected with a coaxial cable.

An optical fiber that transmits multiple modes over a given operating wavelength. According to the distribution of refractive index, it can be divided into mutant type and gradient type. The numerical aperture of the ordinary multimode fiber is 0.2±0.02, the core diameter/outer diameter is 50μm/125μm, and the transmission parameters are bandwidth and loss. Because there are as many as hundreds of modes transmitted in multi-mode fiber, the propagation constant and group rate of each mode are different, so that the band width of the fiber is narrow, the dispersion is large, and the loss is also large, which is only suitable for medium and short distance and small capacity fiber communication system.

Fiber optics, by contrast, are much more complicated. Fibre Channel switch optical ports of different rates are different, such as SFP (Gigabit optical interface), SFP+ (10-Gigabit optical interface), the project will also encounter QSFP+ (40G optical interface).

The history of optical modules

Optical module is a device that converts optical signals into electrical signals or electrical signals into optical signals, which is widely used in communication, data center, industrial automation and other fields. With the development of science and technology, optical modules are constantly upgraded, more and more powerful, smaller and smaller, and more and more stable performance.

In the early 2000s, with the rise of the Internet, the demand for data centers was also growing, and the requirements for optical modules were becoming higher and higher. In 2003, the SFP optical module began to be used in data centers, replacing the original GBIC module. The SFP module is not only smaller and faster, but also has functions such as hot swap and digital diagnosis for easy maintenance and management.

In the 2010s, with the development of technologies such as high-definition video, cloud computing, and the Internet of Things, the demand for optical modules is becoming more and more diverse. At this time, the QSFP optical module and CFP optical module came into being. QSFP optical module is a high-speed optical module that supports 40Gb/s and 100Gb/s data transmission, and is widely used in data centers.

To use the 10 gigabit optical port on the switch, you need to plug in the SFP+ 10 Gigabit optical module. The 10 Gigabit dual-core optical module (the dual-core optical module is most commonly used, and one receives and one delivers) has two LC ports.

If two switches are connected, LC-LC optical fiber jumpers are required. If switches are connected to a distribution frame, the type of the distribution frame depends on the type of the distribution frame. If the peer end is an FC distribution frame, the jumper is LC-FC.

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