The light on the lan above the cat lights on the red light why?

First check whether the signal light on the "cat" will flash (the cat is different, the indicator light is also different, mainly DSL, ADSL, LINE, LINK, etc. are broadband signal indicators), if you want to flash, check whether the line is connected (mainly on the separator, there are three ports, each port corresponds to a line, the connection method is the bus is the line port of the incoming line, the phone port is connected, in addition to the modem or adsl connected to the broadband cat, you can also directly connect the incoming line to the cat to try, In this way, the separator can be ruled out), if the connection is still flashing, check whether the ** line has a joint, and the signal will not be stable if the line oxidation contact is not good.

Confirm that the adsl modem dialing is normal, because the IP automatically obtained by the network card is not cleared, so when dialing again, the network card cannot get the new IP address will prompt 678, the operation method is: turn off the adsl modem, enter the network connection of the control panel, right-click the local connection and select disable, after 5 seconds, right-click the local connection to select enable, and then turn on the adsl modem dial-up.

If the first step is invalid, disable the local connection (NIC), restart the computer, enable the local connection (NIC), and then enable the ADSL modem.

Check whether the NIC light is on, and if the NIC light is not on, check the NIC and network cable.

Reinstall the NIC driver.

Contact customer service to check that the port on the telecommunications bureau is loose, resulting in the line being blocked.

If there are more than two computers at home, and the hub port used to connect to the computer is damaged, there will also be a "678 error", so you can replace it with a good port.

The link light inside the LAN of some wireless routers is originally red, you are mistaken, and the power indication is the same light, which is normal.

The first floor is! The red light on that LAN is a local connection! The yellow light above the link is the external network connection! Your hate is normal! Mine is also a Huawei MT800!

1.The light is red, indicating that your network traffic is relatively high.

2.Normal. There is no problem with the router.

3.If there is no connection in the LAN, the light will not be on, the light is green to indicate that the network is free, orange means busy, and red means to indicate red.

Crowded. You restart the route, turn off the software with a large network traffic, and then look at it.

The red light is 100m

The green light is 10m

There is no problem with the router you bought.

It's that your previous router is older.

I think the color of that lamp should be clear.

The lack of optical signal is usually due to the presence of the following conditions:

1. There is a problem with the optical interface of the optical modem, and the optical modem needs to be replaced.

2. The indoor pigtail connection optical cat connector is loose, and the connector can be restored by plugging it in;

3. The bending of some optical fibers in the limb chamber is too large. Excessive bending of the optical fiber will affect the total reflection transmission of the optical signal in the optical fiber, as long as the optical fiber is straightened;

4. If the optical fiber of the outdoor part is broken or the optical port of the equipment in the computer room is faulty, you need to contact the staff to report the fault.

When the LAN indicator of the modem is always on, it means that the cat is connected to the computer or other electronic devices normally, but there is no network data being transmitted, and in most cases, the computer is not turned on. When the LAN indicator of the optical modem is off, it means that there is no connection, and the fault needs to be checked for network cable, crystal header, network port, and network port and modem.

In multimode fiber, the diameter of the core is 50 m and two, which is roughly the thickness of a human hair. The diameter of the single-mode fiber core is 8 m to 10 m, and the commonly used one is 9 125 m. The outside of the core is surrounded by a glass envelope with a lower refractive index than the core, commonly known as cladding, which keeps the light inside the core.

Beyond that is a thin layer of plastic coat, the coating, which protects the cladding. Optical fibers are usually bundled and protected by an outer shell. The core is usually a double-layered concentric cylinder made of quartz glass with a small cross-sectional area, which is brittle and easy to break, so it needs an additional protective layer.

It is most convenient to find a maintenance person, when the line is dropped, the light flashes, there is a problem with the line, or the cat is bad. If the PC light does not turn on, the network card may be defective, or there may be a problem with the network cable connected to the network card. Usually, the link indicator flashes rhythmically, indicating that the data is not synchronized, and Yechun is trying to synchronize, in this case, it is often the line that is faulty.

First listen to whether there is any noise from the bus line that enters the house, and there is a noise: there is a problem with the line. Looking for a repair.

There is no noise bus to connect the cat to the bus to see if the signal can be synchronized. If it can, then there is a problem with the indoor wiring. It can't be that the cat is bad, and there is a problem with the telecommunications bureau.

Indoor line defect disposal method: the first step, please check the indoor ** line, if there is a joint on the line, you need to remove the oxide layer of the joint and tighten the line joint. Turn the modem back on, and if it is still out of sync, proceed to step 2.

The second step, the incoming plug of the voice data separator is directly plugged into the ** line interface of the modem, and the purpose of this is to eliminate the influence of the separator on data communication and re-turn on the modem power supply. If it is synchronized, it means that the separator is faulty or the line plug-in part is in poor contact. Poor contact users can use a knife to gently scrape the ** line crystal head contact to solve it.

If it doesn't work, try replacing the separator. If you still can't sync, proceed to step 3. The third step, remove all and ** on the ** machine, the purpose of this is to eliminate the impact of the ** machine on data communication, if the same mountain to say the step, it means that there is an error in the parallel wiring, according to the correct scheme and connect the ** auxiliary machine.

In a word, ** have to go through the separator, ADSL or Modem to connect the cat, phone to **, Line to connect to the incoming line.

Flashing means that the network is connecting, and there is a signal. Because the power supply on the optical modem is connected separately; Similar to the appearance of a charger; If you don't use it, you can unplug the adapter; Or just turn off the power strip switch.

LAN Light Status Description:

LAN light is the connection indicator between the cat and the computer or LAN device, the computer or LAN device has been powered on, and the connection is always on under normal conditions, the LAN light of some brands of cats has the role of the cat network port data sending and receiving indicator, which will flash with data transmission.

Different brands and models of cats may have different identification methods for LAN lights, Huawei cats are identified as lan, Tianyi cats are identified as lan, UT-Starcom is identified as PC, D-Link is identified as Ethernet, and Alcatel is identified as a symbol of one in and four out.

When the computer or network device is powered on, this light will light up, if it does not turn on, it means that the network cable is not plugged in properly or the network cable is broken.

The tx light is the send data indicator, and the rx is the receive data indicator, and both lights will flash with the data transmission during normal communication. Different brands and models of cats may have different identification methods for data transmission indicators, some will be identified as data, and some will be multiplexed with link lights or LAN lights. Alcatel cats do not have this indicator.

When browsing the Internet, if the data indicator does not flash and the network is not connected, it may be that the ADSL cat is dead or malfunctioning, you can try to turn off the power switch and turn it back on after ten seconds.

The link should be on to surf the Internet, and the LAN will flash quickly when you have a data stream online. Your situation should be in arrears or there is a problem with the line.

** The software is unstable; 3: ** The quality level of operation and maintenance is low; Failure to troubleshoot in a timely manner; For example, if the other is very good, and a certain one is particularly bad, this is the problem of the company itself, and it has nothing to do with the operator or the user.

User (responsibility) The following factors will lead to your current state, if there is no problem with the above-mentioned operators after detection, the next is your user's own problem; You can directly call the operator** and let the operator give you the operator's own related matters.

What if it's a line issue.

It should be the problem of Internet hunger, which can be analyzed in the following way:

1. LAN means LAN, and it keeps flashing to indicate that there is data being transmitted within the scope of LAN. It does not mean that the network connection is connected.

2. ADSL equipment is mostly composed of POWER (power light, required to be on, indicating that the power supply is stable and maintained), ADSL or LINK (required to be on, indicating that the line connection from the ISP (network) ** business is normal, LAN + DATA (flashing, indicating that there is data transmission).

If the network connection is not available for the reason:

1. There may be a problem with the router settings, and you need to reset the router.

2. It may be that the crystal connector of the network cable is damaged and the crystal connector needs to be replaced.

3. It may be that the router is damaged, and you can replace it with a new one.

4. It may be that there is a problem with the entire network in your local area. Waiting for the fix.

External modem:

The external modem is placed outside the chassis and connected to the host computer through the serial communication port. The modem is handy, easy to install, and the flashing indicator light makes it easy to monitor the operating condition of the modem. However, the external modem requires the use of additional power supplies and cables.

Built-in modem:

The built-in modem needs to be disassembled during installation, and the terminal and COM port need to be set, which is cumbersome to install. This modem takes up the expansion slot on the motherboard, but does not require additional power supplies and cables, and is cheaper than an external modem.

The LAN port is flashing, indicating that there is data transmission, and the computer has sent and received, indicating that your computer and the router are connected, and there is no problem with the local area network.

If you can't access the Internet after connecting to the router, it may be a problem with the router. Then you need to set up the router.

Setup of the router:

1. The bus of the broadband network is connected to the WAN port of the router, and the LAN port of the router is connected to the computer.

2. After starting the device, open the browser and enter it in the address bar to enter the wireless router settings interface. (If you can't get in, please look at the nameplate at the bottom of the router or the router instruction manual, the default settings of different models of routers are different.) ）

3. An account and password to log in to the router appear in the settings interface, enter the default account and password admin, or refer to the manual;

4. After successful login, select the interface of the setup wizard, which will automatically pop up by default;

5. After selecting the setup wizard, a window will pop up to explain that you can set the basic parameters of the router through the wizard, and click Next directly;

6. Set up step by step according to the setup wizard, select the Internet mode, usually ADSL users choose the first PPPoE, if you use other network service providers, select the following two according to the actual situation, if you don't know how to choose, directly select the first item to automatically select, convenient for novice operations, click next after selection;

7. Enter the account and password applied for from the network service provider, and go directly to the next step after the input is completed;

8. Set the wifi password, try to make the alphanumeric combination more complicated, and it is not easy to be rubbed off the network.

9. After entering correctly, it will prompt whether to restart the router, select Yes to confirm the restart of the router, and you can access the Internet normally after restarting the router.