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How to Troubleshoot Transceiver And Switch Ports Through Loopback Testing?

Views: 116     Author: Site Editor     Publish Time: 2021-05-25      Origin: Site

The optical fiber network is a light transmission tool that uses the principle of total reflection of light in fibers made of glass or plastic to connect to the company, home or computer room. This is mainly converted to a common RJ45 network cable connected to the computer by a switch or other terminal, also called a LAN. The IP is automatically assigned by the switch or other terminal. The internal network IP needs to be set in the background of the terminal. The default is automatic and no dialing is required.



Fiber Transceiver


A transceiver is a device for signal conversion, usually referred to as an optical fiber transceiver. The emergence of optical fiber transceivers converts the electrical and optical signals of the twisted pair to ensure the smooth transmission of data packets between the two networks. At the same time, it extends the transmission distance limit of the network from 100 meters of copper wire to 100 kilometers (single mode fiber).


The optical fiber transceiver breaks the 100-meter limitation of the Ethernet cable in data transmission. Relying on high-performance switching chips and large-capacity buffers, while truly achieving non-blocking transmission and switching performance, fiber optic transceivers also provide functions such as balancing traffic, isolating conflicts and detecting errors to ensure high security and stability during data transmission. Therefore, for a long period of time, fiber optic transceiver products will still be an indispensable part of actual network construction. In the future, fiber optic transceivers will continue to develop in the direction of high intelligence, high stability, network management, and low cost.


The failure of the fiber optic transceiver will result in slow network connection and poor network signal.




A switch is a network device used for the forwarding of electrical (optical) signals. It can provide an exclusive electrical signal path for any two network nodes connected to the switch. The most common switch is an Ethernet switch. Other common ones include telephone voice switches, optical fiber switches, etc.


Whether it is manual switching or program-controlled switching, it is for the transmission of voice signals and is a circuit switching that requires an exclusive line. The Ethernet is a computer network that needs to transmit data, so it uses packet switching. But no matter which switching method is adopted, the characteristic of the switch to provide an exclusive path between two points will not change.


The common interface forms of switch ports are divided into SC, FC, LC, etc. Once the switch port fails, it will affect the normal operation of the network.


Related fiber optic adaptors include sc to fc adapter, sc to lc adapter and lc to sc adapter.


Related fiber patch cords include single mode fiber patch cords and multimode fiber jumpers.


Loopback Test


In summary, the failure of fiber optic transceivers and switch ports will affect the normal operation of the network. So how to eliminate these faults through a loopback test?


Loopback test is a common method for communication port/line maintenance and troubleshooting. Because this kind of test is simple and convenient, it can quickly locate port/line faults without requiring special instruments and software. The main test method is to short-circuit the receiving and sending end of the device or line under test, and let the device under test receive the signal sent by itself to judge whether there is a breakpoint in the line or port. You can also hang a test instrument on the looped line to test the transmission quality of the looped section of the line.


The function of the fiber optic terminal box is to provide optical fiber and optical fiber fusion, optical fiber and pigtail fusion, and optical connector handover. The termination box for fiber optic cable provides mechanical protection and environmental protection for the fiber and its components, and allows proper inspection to maintain the highest standard of fiber management. In addition to testing the switch ports, the check of the fiber termination box cannot be missed.

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