The old and new models of Mercury routers with SYS lights have the opposite rules. When disconnecting from the network, check the lights first before taking action.

At around 11 o'clock last Wednesday night, my cousin sent me a ten-second video of the camera looking at his router.: Brother, this light keeps flashing, has it been hacked?

I enlarged the video and watched it twice, and asked him to move the camera to the row where the network cable was connected and take another shot. Yes, what he was staring at was not the system light at all, but the data light on the WAN port - that blinking light meant that there was data running back and forth between the optical modem and the router, which was a good thing. The real system light is on quietly and constantly on the panel, which is normal.

This thing reminded me: When most people are disconnected from the Internet, they stare at the lights on the router, but they can't tell which one is responsible for what. This article will clarify the lamps on the Mercury panel, and then give a set of instructions for troubleshooting the lamps when the network is disconnected.

Recognize the light first: There are only a few on the panel, each with a section.

Mercury's routers, regardless of whether they are old or new, don't have many lights. Old models have five or six, while newer models only have three or four. Check your seats one by one:

Remember a formula first: If it stays on, it means that the line is connected; if it flashes, it means there is data running; if it doesn't light, it means that the line is not connected at all. . These three sentences can handle 80% of the lighting scenes.

The mistake my cousin made is typical: Treat "flash" as a fault. On the contrary, the lights of the WAN port and LAN port flash, indicating that data is flowing, which is a healthy sign. What we really need to worry about is that the light that should be on is not on.

By the way, if the lights are all normal and the Internet is working, I just can’t log in to the background. melogin.cn , that’s another thing, go read what I wrote Troubleshooting five situations that cannot be opened , don’t waste time on lights.

The most annoying thing is the system light: It is normal for the old model to flash slowly, and it is normal for the new model to be constantly on.

The system light is the hardest hit area for misjudgment. Because of the old and new generations of Mercury machines, the "normal" appearance of this light is backwards.

The old Mercury I bought in 2016 is now retired and lying in a drawer. The system light is Flash slowly every second , it’s like a heartbeat, that’s normal. If it stops flashing, stays on, or simply goes out, something is really wrong with the machine.

My cousin’s D191G belongs to the later cloud routers, the ones that can be tied to MERCURY ID and remotely managed via mobile app. The rules are exactly the opposite.: It flashes a few times when powering on, then stays on and does not move, which is considered normal. . If you look at it based on the old experience of "flash equals disease", you will probably mistake a good machine for a bad one.

So before looking at the system lights, first identify which generation of machine you have and where is the model number? Wrote a separate article . A rough way of dividing: The background is an old-fashioned tree menu on the left. Most of them are old models. Log in. melogin.cn Most of the ones that appear on the big icon page are new cloud routers.

There is also a third state that needs to be taken out separately.: System light flash mob , the heartbeat is much faster than normal, and the Internet cannot be connected - this is not a difference in rules between the new and old models, but a problem at the firmware level. I will tell you how to fix it later.

If the network is disconnected, please unplug the power and check the positioning of the lights on the third floor.

The real purpose of the lamp is to cut the home network into three sections, allowing you to know which section the disease is in.: Incoming line section (optical modem to router), router body section, outgoing line section (router to computer TV). Follow this order when the network is disconnected:

This is how my cousin solved the case that time. He said the light kept flashing and asked me to watch the video. The first thing I asked was: Is the WAN light on Lianguangmao on? He looked closer and saw that it was not bright. When I went to see the optical modem again, the LOS light was flashing red - there was something wrong with the optical path, and it had nothing to do with the router. Later, I called 10000 to report the low light, and the master came to fusing the fiber and finished it. Interpretation of the lights on the optical modem It is another book that must be studied separately.

If he followed his own idea of ​​"restarting the router" and unplugged the power and tried it again, the light would still be the same, and it would be a waste of half an hour. This is what it means to look at the lights: The light is a triage table, not a verdict , it tells you which section to search, rather than directly declaring who lives and who dies.

Before looking at the lights, there is a prerequisite question.: Is the whole house outage or just one device? Is the WiFi still there? I'm here for this triage The article about the disconnected general ledger It has been written in that you should distinguish this first and then look at the lights, the order is correct.

That time the system light flashed quickly, it took me three steps to save it.

I had an actual battle last winter. The main router at home was sent for repair, so I dug out the old Mercury from the drawer to take over temporarily. The next night, the system light suddenly changed from slow flashing every second to fast flashing, and the network was disconnected.

The first step is to power off and restart. After letting it go for thirty seconds and then powering it on, the slow flash came back, and it stayed stable for two hours before it happened again. It shows that restarting treats the symptoms but not the root cause.

The second step is to touch the temperature and upgrade the firmware. The casing is warm and not hot, so rule out overheating first - I will tell you how to judge by touching the casing in this article Overheating actual measurement Wrote in. There is no automatic upgrade for the entire Mercury system. I went to the official website and manually flashed the last firmware package under the hardware version. The interval between flashes was obviously longer, but it still happened the next day.

The third step is to treat a dead horse as a doctor, hold the stuck needle against Reset, restore the factory, and reconfigure the broadband account. This time it stabilized, and then it lasted for half a month until the main router came back.

Experience in three steps: The system light flashing quickly is basically a matter of the system firmware layer, and the processing sequence is Reboot, firmware, reset . Remember to copy your broadband account number before resetting. I wrote the rescue list in Factory reset article inside ； The pitfalls of firmware and hardware version under the official website are found in Upgrade that article Li said it thoroughly.

To be honest, occasional flash flashes in old machines may be a sign of aging. The capacitors and flash memory are old. I didn’t let the old Mercury do heavy work anymore. How many years can the router last? What signals should be retired? In this article life account Calculate it. If your machine dies a few times a week, you can set a scheduled restart. Mercury backend calls it "automatic cleaning." Set the path in this article .

The network port light cannot tell the speed. It seems too bright and there is no software switch.

The lights on the WAN port and LAN port are basically single-color on home computers. They are only responsible for telling you "whether there is communication and whether there is data". I am not responsible for telling you whether it is Gigabit or 100M. .

Only some multi-port models and commercial-oriented machines have two-color speed lights. The rule for TP-LINK commercial machines is that green equals Gigabit and orange equals Hundred Mbit. Don’t guess if you use a single lamp at home. There are two ways to see the truth.: First, log in to the background and check the connection rate of the WAN port. It will be clear at a glance if it shows 1000Mbps or 100Mbps. ； The second is to look at the hole inserted into the cat's end. How to identify Gigabit port and 100M port I wrote about it separately.

Incidentally a reminder: If the Gigabit port drops to 100 Mbit, the light will not be able to tell. A four-core network cable, oxidation of the crystal head, or poor panel contact will secretly reduce the negotiated speed to 100 Mbit/s, and the measured speed will always be capped at just over 90 Mbit/s. I have also written a complete investigation of this matter, just look for the digital characteristics.

Add another reverse question: Some people are not afraid that the light will not turn on, but they dislike it. Mercury basically does not have an LED light switch in the background - some models of Xiaomi and Asus have it, but most Mercury models do not. If it's dazzling at night, use physical means: Cut small strips of four millimeters wide from electrical tape, or buy indicator light shielding stickers that cost a few dollars a piece, and stick them around the row of network ports.

System lights and network port lights are two different things: The system light is managed by firmware, so individual models can be turned off by software. ； The network port light is directly driven by the switching chip. The software cannot turn it off, it can only be attached. The difference between the two is Turn off the lights It has been dismantled.

One more sentence: Don't be annoyed if the network port light flashes wildly in the middle of the night. It is telling you that data is being transferred. It is normal for your home devices to be synchronized and backed up in the early morning. The day it stops flashing, it will be your turn to be nervous.

ending: One set of order to take away

The network is disconnected. Don’t rush to unplug the power. Go through it in this order.:

• First, distinguish whether the whole house is out or a single device is out, and whether the WiFi is still there.
• Look at the WAN light: If it doesn't work, check the modem and incoming cables. The router is probably innocent.
• Look at the system lights: The old model should be flashing slowly but not flashing, and the new model should be constantly on but flashing wildly. Press the three steps of restart, firmware, and reset.
• Look at the LAN light: If it doesn’t light up, change the network cable and port, and check which device is connected to it.
• The lights are all working properly and I can’t log in to the background. That’s a login problem and has nothing to do with the lights.

The light is a triage table. The positioning of the third stage is clear. You either need to do it yourself and have a direction, or you can explain clearly when you call for repairs - the equipment that the master brings to the door is different when he hears "WAN light is not on, LOS is flashing red" and when he hears "network is not working".