The fiber interface is the physical interface used to connect the fiber cable. The principle is to use light from the optically dense medium into the light-dissipating medium to cause total reflection. There are usually several types of SC, ST, FC, etc., which were developed by NTT Corporation of Japan. FC is the abbreviation of Ferrule Connector. The external reinforcement method is metal sleeve and the fastening method is screw buckle. The ST interface is usually used for 10Base-F, and the SC interface is usually used for 100Base-FX.
The electrical port is relative to the optical port and refers to the physical characteristics of the fire extinguisher. It mainly refers to the copper cable, including the ordinary network cable and the RF coaxial cable, and is the processed electrical signal. At present, the universal network interface has hundreds of megabytes and gigabit ports. Simply put, the electrical port is a common Twirst Pair interface, generally at 10M or 100M, and partially supports 1000M. The maximum distance of the electrical port is 100 meters. The optical signal is transmitted on the cable of the optical port, and the electrical signal is transmitted on the cable of the electrical port, such as a high level (representing 1) and a low level (representing 0).
Both the optical port and the electrical port have the same purpose, and are all external communication interfaces for transmission. To put it simply, the transmission medium is different. The optical port is connected to the optical fiber, and the electrical port is connected to the ordinary communication cable. The biggest difference is that the optical port with high communication speed is required, and the power port is not so demanding.
The following is a detailed introduction.
1. It is the transmission medium transformation on the pure physical layer, which is actually the conversion of optical signals and electrical signals.
2, the optical port is what we usually say with the optical board expansion slot can be inserted into the fiber for long-distance data transmission, the electrical port is what we often say RJ45 port is also the network cable port, the switch with the network management can carry out the function and authority of the switch Management and online monitoring of device status with network login. The non-network management type is the fool type plugged into the line and used directly, generally only the second layer switching function.
3, 155Mb / s are all electrical interfaces, 155Mb / s are optical interfaces; 155Mb / s can be electrical or optical;
The intra-office connection can be an electrical interface or an optical interface;
Interoffice connections are optical transmissions;
The electrical signals are connected by coaxial cable.
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