3G network card: green light flashes cross flashing red light, but the connection does not connect t

Summary. First of all, check whether there is a problem with the network cable, you can use a line tester, or you can find a place with a network in another place to try. In addition, whether the electronic network equipment is working properly, whether the router, fiber modem or hub is working properly.

The above content is eliminated one by one, to determine that there is no problem, or can not go online, it is recommended to contact the network ** business to come to the service.

The network card is green and yellow, and the network is not connected, what's going on?

First of all, check whether there is a problem with the network cable, you can use a line tester, or you can find a place with a network in another place to try. In addition, whether the electronic network equipment is working properly, whether the router, fiber modem or hub is working properly. The above content is eliminated one by one, to determine that there is no problem, or can not go online, it is recommended to contact the network ** business to come to the service.

The status is that the computer is connected to the upper device normally, if there is a router, it should not be dialed, because the network of the router is not connected. If there is no router and the computer dials up directly, the operator's optical modem is not connected to the network.

That's not receiving a 3G signal.

3G network card is currently widely used in wireless WAN communication network as a network medium. At present, China has three network standards: China Mobile's TD-SCDMA, China Telecom's CDMA2000 and China Unicom's WCDMA, so the common wireless network cards include CDMA2000 wireless network cards and TD and WCDMA wireless network cards.

The mobile TD-SCDMA network card, the maximum theoretical speed is 384kbps, which is the same speed as the Edge wireless network card of the times, as a 3G network card, this speed will definitely not be accepted by users. Fortunately, China Mobile also saw this shortcoming, and introduced HSDPA technology in the second phase of the construction of TD-SCDMA, which increased the maximum theoretical speed to, which can be said to have qualitative room for improvement.

China Unicom's WCDMA network card, the highest theoretical speed, the fastest speed among the three types of network cards, WCDMA network card has such a high speed is also due to the introduction of HSDPA technology. Judging from foreign experience, the speed of WCDMA network card is generally reachable, which has surpassed the downlink rate of 2M ADSL in China.

In order to catch up with the speed of China Unicom, China Telecom has begun to deploy the faster version B (Rev B) in some large and medium-sized cities, and the maximum theoretical speed can be reached, further narrowing the gap with China Unicom.

1You check if your network card is not installed, right-click on my computer--- click on the device manager--- see if there is an exclamation mark--- if there is a network card driver is not installed, uninstall it and reinstall it, 2 If there is no exclamation mark, the program of your network card has been messed up and needs to be repaired,

It should be hardware or software and firmware damage, which can be repaired and seen.

What model, there should be an instruction manual when you buy it.

Your motherboard socket is loose, take it to the computer repairman to test it.

You're in poor contact, you get the interface right, and it's been a long time.

It should not be a network card hardware damage.

Open the broadband connection to see if it is not enabled, enabled or not connected, you can try the following methods: 1. The user is too far away from the computer room, the line loss and interference are large, especially if multiple machines share a network cable to access the Internet, most of the people in this situation are using more people or using BT**, or some computer poisoning causes a lack of signal resources, and the network will be disconnected during the peak period of Internet access. 2. Check the heat dissipation of the modem, router, and switch, turn off the power supply, unplug and plug it back in, turn the power on again, or reset the router to replace the problematic network hardware.

3. Problems with network settings. This reason is more likely to occur when you need to manually specify the IP, gateway, and DNS server networking mode, and use the ** server to access the Internet. Reset your computer's network settings.

4. If there is a problem with the NIC driver, you can try to re-drive the NIC and replace the NIC driver. 5. Internet Explorer Problems. When the IE browser itself is malfunctioning, or the IE is damaged by malicious modifications, it will also lead to the inability to browse the web, then you can try 360 Security Guard or Super Rabbit to repair IE, or reinstall IE.

6. Infection with the virus, antivirus. 7. Problems with network firewalls. If the network firewall is not properly set, such as the security level is too high, the IE is accidentally put into the block access list, or the firewall policy is incorrect, you can try to check the policy, reduce the security level of the firewall, or simply turn off the firewall to see if it returns to normal.

8. Repair or reinstall the system for system file problems.

Exclusion method:

1.Does the laptop work elsewhere? Yes, it is determined that it is a line problem, and the desktop can basically not be judged at a time, and the problem is not big.

2.Have you tested the crystal head, whether the pliers of the crimping line are normal, I have touched the pliers badly, and the crystal head cannot be pressed.

Line tester 30 40 a, you can borrow the best, you can't borrow, go buy one, it's a bit troublesome, but don't dislike it if you want to recover.

3.The line is re-tested, after the 8 lights are right, (remember that the crystal head is not stuck on one side from right to left: brown, brown and white, green, blue and white, blue, green and white, orange, orange and white, don't make a mistake), take the notebook again, OK, change the desktop machine test, you can solve it, no, it is still the line is not good.

Yours continue to check.

4.There is also something to consider, (is the green light flashing of the network card desktop, remember to rule out the problem that the network card hardware is broken, or the switch port is broken, and changing the network card and the switch port are necessary means.)

If it's more troublesome to just use a computer, find a laptop and plug it into the Internet cable to try, no problem is the machine's business.

Since it's not a problem with the machine, I'll look up the line. Why don't you try to change the line, it's troublesome to change the crystal head. Is there a problem with the switch? Ping.

There are many problems that cannot be connected to the network, and this is not only a single problem, from the network, the cat, the connected network cable, the router, the network card, and the computer system.

Fourth, the problem of the network firewall, etc., only one of the problems in the Qiaoyou debate in its ruin, it is that it cannot be connected to the Internet.

The solutions are: First, first see whether the power supply and indicator lights of the cat and the router are normal.

Third, if the network firewall is not properly set, such as the security level is too high, the IE is accidentally put into the blocked access list, the wrong firewall policy, etc., you can try to check the policy, reduce the security level of the firewall or simply turn it off to try to see if it returns to normal.

Fourth, restart the router from the new settings.

Dear, if the computer can't access the Internet, maybe your network is in arrears or malfunctioning, or the router is not set up properly, IP conflicts, DNS and other problems.

You can try to use the PC Manager "Network Repair" feature to repair it, <>