Knowledge

Ethernet port – RJ45

   As shown in the above figure, we can understand the appearance of RJ45 according to the picture, but not all RJ45 interfaces like the one in the above figure are RJ11 interfaces, which will not be discussed temporarily. The switches are arranged side by side with multiple RJ45 ports, which ca... Read More

Compatibility of Optical Modules

Generally speaking, the compatibility of optical modules refers to whether the modules can work normally on communication equipment of different brands and manufacturers. The technology content of optical modules is relatively low, and their introduction is relatively simple. As a result, many t... Read More

The Working Principle of The Switch 

or the OSI reference model, the switch works on the second layer of this model, the data link layer. As shown in the following figure, the switch has eight ports. When a device is plugged into the switch through RJ45, the switch’s master chip will identify the ports plugged into the network... Read More

Introduction to PON Module

A PON module is a kind of optical module. It works on OLT terminal equipment and connects with ONU office equipment. It is an important part of the PON network. PON optical modules can be divided into APON (ATM PON) optical modules, BPON (broadband passive network) optical modules, EPON (Ethernet... Read More

The Principle of Frequency Hopping Spread Spectrum Communication (FHSS)

FHSS, frequency hopping spread spectrum technology, under the condition of synchronization and simultaneity, accepts the signals transmitted by narrow-band carriers of a specific type (this specific form has a specific frequency, etc.) at both ends. For a receiver without a specific type, the hop... Read More

OFDM — 802.11 Protocol Description

OFDM has been proposed in IEEE802.11a. Based on this method of modulation, we need to know what OFDM is to understand the different protocols.  What is OFDM?  OFDM is a special multi-carrier modulation technology. This technology aims to divide a channel into several orthogonal sub-channels, and ... Read More