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    • By Admin / 17 Sep 22 / 0 Comments

      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...
      Ethernet port – RJ45
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    • By Admin / 16 Sep 22 / 0 Comments

      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...
      Compatibility of Optical Modules
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    • By Admin / 15 Sep 22 / 0 Comments

      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...
      The Working Principle of The Switch 
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    • By Admin / 14 Sep 22 / 0 Comments

      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...
      Introduction to PON Module
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    • By Admin / 08 Sep 22 / 0 Comments

      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...
      The Principle of Frequency Hopping Spread Spectrum Communication (FHSS)
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    • By Admin / 07 Sep 22 / 0 Comments

      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 ...
      OFDM — 802.11 Protocol Description
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