What is the reason that the router signal LED is not lit on the net?

one, the signal LED is not bright

The signal light does not indicate that there is no signal for transmission, but it is certain that the lines are normal, using the replacement method to swap the network cable connected to another computer or use a tester to check for signal transmission. Signal transmission is the problem of local network card, in the actual work experience proved that the NIC caused no information transmission is a more common router failure.

First check the network card installation is normal, IP settings are wrong, you can try to ping the IP address of this computer, if you can ping general instructions to explain the network card is not too big problem. If it does not work, you can try to reinstall the NIC driver to resolve it.

For some uses the integrated network card or the quality is not high the network card, is apt to appear the unstable phenomenon, namely all settings are correct, but the network does not pass, to this can disable the network card, and then re-enable the method, also can have the unexpected effect

　　Second, the connection led is not lit

Observe the back side of the NIC RJ45 side has two lights, they are the connection status LED and signal transmission led, where the normal state of the connection status indicator is green and long bright, signal LED is red, normal should keep flashing.

If the connection LED is found, that is, the green light is not lit, it means that the network card connected to the hub or switch connection has a router failure. This can be used to block the elimination of the tester, if from the switch to the network card through a plurality of modules interconnect, then you can use the two-point method for rapid positioning.

In general, this kind of router fault occurs most of the network cable is not fastened, the use of the first reason of inferior crystal, fault points are mostly connected at both ends of the problem, such as the switch port and connected to the computer network card at the connector, with a tester can be very easy to find a router to solve the

　Third, the firewall causes the network not to pass

(1) When users first use IE access to a Web site, the firewall will ask whether the program to allow access to the network, some users because they are not careful to allow this will be followed by such settings, naturally lead to network impassability, the total solution is to remove this restriction in the firewall.

(2) In order to ensure security in the local area network, many friends have installed a number of firewalls, so it is easy to cause some false faults, such as ping impassability but can access each other's computer, can not access the Internet but the use of QQ.

To determine if a firewall is causing a router failure is simple, you only need to temporarily shut down the firewall, and then check for the existence of a router failure.

　　Four, the use of spin down

Many network cards are using 10m/100m Adaptive network card, although the default settings of the network card is adaptive, but by the switch speed or network cable production methods, there may be some mismatch.

Right-click the local Area connection to open its Properties window, clicking the Configuration button on the General tab, switching the Open Network Card Properties window to the Advanced tab, selecting Link Speed/duplex mode in the property list, and choosing Fullmode in the Value drop-down menu on the right. Click the OK button to save the settings in turn.