I don t understand the network cable problem 40, I don t understand the network cable problem

Standard 568a: Green-White--1, Green--2, Orange-White--3, Blue--4, Blue-White--5, Orange--6, Brown-White--7, Brown--8

Standard 568b: Orange-white--1, Orange--2, Green-white--3, Blue--4, Blue-and-white--5, Green--6, Brown-white--7, Brown--8

If you use A or B at both ends, we call it a through line.

If you use A at one end and B at the other end, we call it a crossing.

The above is the connection method of the 100 megabit network cable, if it is not connected according to the standard, in fact, as long as the two connectors are also wired, it can also be used in some cases, I have tried, but some networks cannot be used.

Another problem is compatibility, for example, using A and B on a network at the same time may lead to inexplicable network failures.

The deeper problem is that when it comes to gigabit, you have to wire according to the wiring method of gigabit, otherwise you can only use 100 gigabits, and the speed cannot reach gigabits.

The gigabit line is a double crossing line, which is to do it according to the principle of 8. If you really can't do it, just follow the following method:

1 white-orange vs. white-green.

2 orange to green.

3 white-green vs. white-orange.

4 blue vs. white-brown.

5 white-blue vs. brown.

6 green vs orange.

7 white-brown vs. blue.

8 brown vs white-blue.

It's all the same, it's done for convenience.

The other midline sequence is white-green, green, white-orange, blue, white-brown, white-brown, brown.

In the past, two switches required one for this line sequence, and the other end for that one, but now most of them don't need to be identified internally by themselves.

This is done just to distinguish between orange and green.

And then there's the need to standardize that if one person does a good job, someone else is doing it, it's a waste to do both.

There is a standard at all times. If someone else rules, you will use it.

Both sides do the same, but also the line is long, the anti-interference ability is poor, and the data transmission speed is slow.

I remember someone teaching me to be.

Red-white, red-green-white, blue-white, blue-white, green-brown-white, brown-white.

I learned to do this at the beginning, and it seems to be done like this, with a switch on the top and an equal cable on the bottom.

The possible reasons for the network cable failure are as follows:

1. The network cable has **;

2. When the crystal heads on both sides are in poor contact or crimped, the sorting is wrong.

There are two ways to cross the network cable, one is the crossing line, and the other is the parallel (straight-through) line

568A standard: white-green, green, white-orange, blue, white-blue, orange, white-brown, brown 568B standard: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown The difference between the two practices is that white-orange (white-green) and green (orange) can be exchanged.

Change a network cable; There are three reasons why the network cable is not working; 1. The network cable is broken, (it may be that the crystal heads at both ends of the network cable are broken) 2. The network port of the router is broken; 3. The network port or network card of the computer is broken;

Answer 1: First of all, make sure that the network cable pliers you use are easy to use, how to judge it? You only need to use pliers to make a network jumper, test whether it is good or not, and, try not to use dozens of yuan of network cable pliers, after a long time, the network cable pliers are not easy to use, often can not be pressed to the end, need to be pressed many times, such a serious waste of time and labor costs.

2. The line sequence of the crystal head is not arranged correctly, and the line sequence of the network cable we often use is 568b, orange-white--1, orange--2, green-white--3, blue--4, blue-white--5, green--6, brown-white--7, brown--8

3. The crystal head is good, but the 8-core network cable has a broken core, if you are running a 100 Gigabit network, you can use 4 cores, and if you run a Gigabit network, you need to use all 8 cores.

4. The production of the crystal head is not standard, and the pressed crystal head does not meet the standard, and it is easy to loosen after long-term use.

It has nothing to do with sorting.

If there are other wires around your network cable, there will be electromagnetic interference.

The more common cause is that the line order at both ends of the information panel is confused. Or there are contacts in the trunking.

The outer skin of the network cable may burst in the wind and sun, so just check it carefully and connect it.

The network cable is not easy to use, you can replace the crystal head, if not, you can find someone who understands to help you do it.

1. Line sequence problem, line sequence error, resulting in network failure; 2. The crystal head is not clamped or damaged, resulting in the network being blocked; 3. Network cable problems. Solution: 1. It is recommended to make network cables according to the standard line sequence, and the standard line sequence is as follows: 568A standard line sequence:

White-green, green, white-orange, blue, white-blue, orange, white-brown, brown 568b standard line order: white orange, orange, white.

First, it can be measured with the European mother.

Second, the method of measuring the network cable with a multimeter:

First of all: the orange, orange, green, white, and green 4 wires used in the general network cable are divided into two connection methods: A and B, and the connection method is generally a straight line.

Secondly: find the above 4 wires, short circuit two by two at one end of the network cable, and test whether the resistance is zero with a multimeter at the other end, and zero means that it is on.

The short circuit method can find a very thin copper wire (the enameled wire must be scraped off), and the two ends of the copper wire can be in contact with the electric shock of the RJ45 connector of the network cable (it is more troublesome, it is recommended to cut off the head and twist the two wires together).

You have to use a lot of force to pull the cable inside. I think it's a problem with the crystal head, the transmitter of the tester, just the signal is transmitted, it must be from 1 to 8.

Then do you have one end does not connect to the other end of the line tester, in this case, if the light is on, it means that the line has a short circuit.

The network is generally bad for these reasons:

1. There is a problem with telecom broadband itself.

2. There are problems with network cards, routers, Internet cats, etc.

3. There is a problem with the system (mainly IP settings, DNS, viruses, etc., this range is relatively wide) 4. There is a problem with the network cable. (The impact of cable quality on network speed will only have an effect when the distance is relatively long.) ）

5. The crystal head is not done well, such as poor contact, or not done in accordance with the standard.

Not necessarily, sometimes on vacation, there are many people who use it, and it will not be good!

It has nothing to do with the network cable.

You test the internet speed.