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1. Fabrication of twisted pair: The main connecting cable used for Gigabit Ethernet is twisted pair. In the network, more than half of the faults are caused by poor contact of the twisted pair, disconnection or line sequence does not meet the standard. The standard used for twisted pair is EIA/TIA-568B (line order: orange, orange, green white, blue, blue, white, green, brown, brown) and EIA/TIA-568A (line order: green) White, green, orange, blue, blue and white, orange, brown, brown), we can see from the line sequence, to ensure that 1, 2 and 3, 6 pairs are the same set of lines, and twisted, so It can prevent crosstalk, especially at 100M rate transmission and distance close to 100 meters, which can reduce the attenuation of data signals and prevent packet loss. As the saying goes, "Workers must first sharpen their tools when they want to do something good." Good tools can also do more with less. Cable testers and AMP crimping tools are the most basic line tools.
2. The network configuration of the computer: The configuration of the TCP/IP protocol is incorrect, and the network cannot be connected. The main check is that the computer's IP address, subnet mask, gateway, and DNS server settings are correct and match. The IP address of this network segment cannot be used, and the gateway is another virtual network. This is especially important in LANs with VLANs. In addition, sometimes the user will call: "Why my computer can't find the shared function", in fact, this is his computer's option to "Allow other users to access my files" in the file and print share of the network.
3, network documentation: network documentation includes network design, network wiring diagram, distribution frame comparison table, user Internet port table, switch port configuration table. they
It can reduce unnecessary trouble and confusion, other people can also refer to these materials, eliminate some faults and increase Internet users, and there is no need to give you back from vacation.
"Good memory is not as bad as a bad pen." When you face the hundreds of jumpers in the cabinet and can't figure out the clue, you will realize the importance of the data. Of course, if the network user changes and the configuration of the switch changes, it is necessary to modify and update the data in time, otherwise it will become a bunch of furnishings.
4. The electrical environment of the equipment room: In the past, the ground of the computer room was unified to the ground of the building. In fact, this connection also has limitations. There is a voltage difference between the machine and the machine, which will be damaged by lightning or cause WAN and Loss of data transmitted between machines connected by coaxial cable, communication is good or bad. At present, the connection to the ground of the equipment room is mainly by the ring method. The ground wires of all the equipment in the equipment room are connected into a closed loop and then connected to the ground of the building so that the machine is in a plane of equal potential. When the network fails, the most easily overlooked by network management is a power failure. Everyone thinks that as long as there is no power failure, the power supply is fine. In fact, this idea is wrong. If you encounter an inexplicable failure, it is best to check the power supply first.
