Troubleshooting by ADSL indicator light

Adslasypolicric Digital Subscriber Loop) is an asymmetric Digital user Loop technology that features high performance, low price, connection with a regular phone and is suitable for small office, home, remote office, and other features, it has been widely popularized recently.
However, many users still do not know about the ADSL technology. The installation of devices is performed by technicians of the service provider. Once a problem occurs, the device is helpless. In fact, we can determine and eliminate the problem of ADSL through the indicator on ADSL.

Generally, there are Power lights, Test (or Diag) lights, CD (or Link) lights, and LAN lights on ADSL. They all have different meanings:
Power Light: Power indicator. If the Power light is not on, we all know that there is a problem with the Power supply, it may be that there is a problem with the ADSL or ADSL Power adapter. In this case, contact the repair center. If you want to buy your own power adapter, you should pay attention to the power Input and Output), as well as whether the Input is AC or DC.
Test (or Diag lamp): device self-check lamp. This indicator will flash only when ADSL is enabled. Once the device self-check is complete, the indicator will go off. If the indicator light is on, the device fails to pass self-check. You can try to restart ADSL or reset the device to solve the problem. If the problem persists, there may be a problem with the hardware or software of the device (Firmware) and you must contact the repair center.
CD (or Link) lamp: Synchronous lamp. This indicator indicates the connection status of the line. The CD light will soon be on after it is turned on. If the CD light is flashing, it indicates that the line signal is poor or the line has a problem. Check whether the separator is connected after entry; whether there are other equipment before the separator, such as extension and anti-theft devices; whether the separator is more than 2.5 kilometers away from the Telecommunications Bureau); whether the junction box or crystal head is in good condition; whether there are wireless communication devices, such as mobile phones, and whether the telephone line is damaged. If there is no problem in the household, ask the line maintenance personnel to check whether there is a problem with the outdoor line. When the line is confirmed to be correct, the CD lights cannot be long, but the ADSL may be incompatible with the service supplier's central switch, we recommend that you replace ADSL of different models or brands.
It is particularly important to note that the quality of the line cannot be determined simply by whether a call can be made. There are three channels on the line for activating ADSL: one is a 4 K telephone service channel, the other is a 896k ADSL upstream channel, and the other is an 8 m downstream channel. A call can only indicate that there is no problem with the telephone service channel, and it cannot prove that there is no fault in the ADSL channel.
LAN light: LAN light. This indicator indicates whether your device is connected to your computer. If the LAN light is not on, the computer will not be able to communicate with ADSL, and of course it will not be able to perform normal dialing. In this case, you need to check whether the NIC is normal and whether the NIC is damaged. If the LAN light is on, but still cannot communicate normally, You should also check whether the IP address of your Nic has been modified. The IP address of the NIC must be in the same network segment as the IP address of the adsl lan port. The simplest way is to leave the IP address unspecified so that it can automatically obtain the IP address to be in the same CIDR block as the LAN port IP address.
The above is a simple judgment and Solution to common problems in the use of ADSL. Under normal circumstances, the Power, CD, and LAN lights should be bright, if you are in a flickering or out state, ADSL cannot work normally. You can make corresponding judgments and handle based on the above content to solve these common faults.