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The basic structure of optical fiber is generally composed of outer sheath, cladding, core, and light source. Single-mode fiber and multi-mode fiber have the following differences: Sheath color difference: In practical applications, the outer sheath color of the fiber ca...

Also known as software-defined Wide area networks, SD-WAN has become one of the hottest topics among enterprise network operators and service providers. Why does this happen? On the one hand, an increasing number of Internet-based applications, services and intensive app...

When the PoE power supply fails, it can be investigated from the following four aspects. • Check whether the receiving end device supports PoE power supply. Since not all network devices can support PoE power technology, check the equipment for POE power technology befor...

PPPoE represents a point-to-point protocol on the Ethernet. It is a network tunnel protocol that encapsulates the point-to-point protocol (PPP) in the Ethernet framework. It enables Ethernet hosts to connect to a remote access concentrator via a simple bridging device.Us...

POE power supply is achieved through the network cable, and the network cable is composed of four pairs of twisted pairs (8 core wires), so the eight core wires in the network cable are the PoE switch to provide data and power transmission media for the receiving device....

Step 1: Detect the receiving device (PD). It is mainly to detect whether the connected device is a real receiving device (PD) (in fact, it is to detect the receiving device that can support the Power over Ethernet standard). The PoE switch will output a small voltage at ...