Function of LED Indicator Light
Common network devices have several indicators that monitor the status and operation of the device. These indicators are called light-emitting diodes (LEDs). By fully understanding the meaning of these indicator lights, you can easily and quickly determine the cause of the fault in the process of network fault diagnosis, achieving unexpected results.
Network Card. In normal state, the connection status indicator is green and long on, while the signal indicator is red and should keep flashing normally. If the connection indicator light, that is, the green light is not on, the fault is most likely caused by the network cable is not securely connected or the crystal connector is faulty. And the fault is mostly at both ends of the connection, such as the port of the switch and the network adapter connected to the computer. You can solve the problem by using a line tester or replacing the network cable. If the fault is not caused by the connection, the whole link needs to be segmented with the line tester.
If the signal indicator, that is, the red light is not on, then it indicates that there is no signal transmission, but in the case of green light, it can be sure that the line is normal. You can use the replacement method to connect another computer to the network cable. If the new computer cannot access the internet normally, replace the switch port connected to the computer or restart the switch. If the computer is connected to the Internet, you can be sure that there is a signal transmission, and then determine that the problem is the local network card.
Transceiver. Fiber optic transceiver is an ethernet transmission and conversion unit, also known as photoelectric converter, which can exchange short distance twisted-pair electrical signals and long distance optical signals. Fiber transceivers extend the connection distance of Ethernet, breaking the limit that can transmit only 100m, so they are widely used in the network environment that uses long distance optical fibers.
With the increasing application of fiber optic transceiver, it has become an important fault point in network. If the indicator light of transceiver is normal, the fault can be quickly determined. For example, each indicator of the transceiver is on, but the link indicator of the optical path and the link indicator of the circuit blinks too slowly or blinks asymmetrically, resulting in network failure. Generally, the transceiver can be restored after restarting.
Switch. Indicator lights on switches vary according to their brands, types, and modules. However, the following indicators are generally displayed on the front panel of a switch: power indicator, connection indicator, port mode indicator, and port status indicator. According to the abnormal indicators, you can determine the causes of many switch faults and quickly take corresponding solutions.
- POWER LED. Green light indicates normal power supply, off indicates no power supply. If the power indicator is off, ensure that the power cable of the switch is properly connected and the power socket is in good condition. You can reinstall the power cable of the switch or use another power socket. You can rest assured that all the indicator lights in ATO shop are of high quality.
- LNK/ ACT LED. If the link LED is off, the switch is not connected. Ensure that the switch Settings are consistent with those of other devices and cables are correctly connected. In addition, switches are connected to other network devices through 5 cables, and the distance is more than 100 meters, which will also cause the link LED not bright.
- MODE LED. Port mode indicator Indicates the mode of the switch port. To select or modify the port mode, press the mode button continuously until the port mode indicator indicates the desired mode. Port mode determines how to interpret port status indicators. That is to say, the color of the port status indicator has different meanings according to different modes.