Useful Tips

Computer cable connection methods


Want to know how to connect two PCs or laptops according to the "cable-to-computer-cable" scheme? It is not as difficult as it seems at first glance. The main thing is that you have a cable. And here it is important not to make a mistake. Therefore, carefully and in order, read everything that I write to you here. It is important!

The first idea to connect two computers with a cable came to Larry Roberts in 1967. Actually, the Internet appeared. Therefore, we can safely say that by connecting a computer to a computer with a cable, you will create your own personal Internet network. And you need to start with the selection of cable.

The first thing that comes to mind is to connect two computers via USB

And this, at first glance, is the right thought. Most PC users almost always have it at hand. Or somewhere in the computer cabinet, this USB extension cord is gathering dust for sure. It would seem: I stuck one end of the extension cord into one USB port, and the other into the second and the “thing in the hat”. But here is the problem - for some reason, the connectors at the ends of the cable are different, and in no way fit.

There are several technical nuances that prevent this.

I will not voice them all and I will only say that any USB port produces outgoing voltage, which feeds the connected peripheral devices. And having made a connection through the USB port cable computer-to-computer circuit, we get the output voltage coming from two sides. And it’s not hard to guess how it all ends. Of course, fireworks will not work, but USB ports will stop working on both computers - this is at least.

So is it possible to connect two computers via USB?

Sure! But this requires not a simple, but a special USB cable. It looks something like this:

In this photo cable: PC-Link USB Bridge Cable Link-100

In fact, almost all manufacturers of computers and peripheral equipment now produce such cables. Go to any computer store, or at least a stall selling batteries and chargers for mobile phones and ask for a USB cable to connect two computers and they will sell it to you.

How to use a USB cable to connect two computers

Each model of such a cable has its own instructions for connecting and configuring, which can differ greatly from each other depending on the manufacturer. Therefore, write here something like: "Plug one end of the cable into one connector and the other into the other." I just don't see the point.

Another, of many, option USB cable for connecting computers

Instructions are usually attached to the device. After purchasing this connector, be sure to carefully read the provided manual for connecting it. If, suddenly, it doesn’t turn out to be, then try to find it on the manufacturer’s website, the URL of which is usually indicated on the product’s packaging.

But that's not all. There is an alternative way to connect two computers with a cable, which has several advantages.

Connect two computers with Ethernet cable

But here, as always, there are nuances. A regular Ethernet cable, the one with which we connect to the router, or directly to the provider's network, will not work. For connection according to the scheme "Cable computer computer" In this case, a special crossover cable (crossover) is required.

Cross network cable

Visually, it practically does not differ from a conventional cable for connecting to the Internet. But he has a patch cord (patch cord) cross. In other words, the cabling is a little different.

Patch cords for connecting computers are of two types: four and eight core. Here are examples of twisted-pair cable layouts for connecting two computers to each other.

Four wire cable Eight-wire cable (option number 1) Eight-wire cable (option number 2)

After you purchase a cross-cable, you can proceed to the connection according to the scheme "cable computer computer".

How to connect two Windows computers

1. Connect computers with a cross-cable

We insert the cable into the corresponding sockets of both computers.

All further settings are shown on the example of the Windows 7 operating system. On other operating systems of the Windows family, the connection and settings are approximately the same.

2. Click on the "Start" button and in the search box enter the phrase: "View network connections".

2. A window with network connections will open, in which you must select "LAN connection". Point the mouse at it and go into it "Properties".

3. Find the Internet Protocol version 4 (TCP / IPv4) and click "Properties".

4. Next, on any of the connected computers, set the following IPv4 parameters:

IP Address:
Subnet Mask:
Fields Main gate and DNS server can be left blank.

5. On the second connected computer, we specify the IPv4 parameters exactly as on the first computer, only enter the IP address and save the entered parameters.

On this, the configuration of connecting two computers with a cable is not finished. It is also necessary to check the operability of all the settings made.

Checking the connection between two computers

Before you start using our local connection, you need to make sure that we have correctly configured the data transfer and the protocol packets pass without interference and loss.

1. To do this, on any of the connected computers, call the command prompt window by pressing the key combination Win + r and enter the command: cmd- click "OK"

2. At the command prompt, for example, on a computer with IP address, execute the command: ping

If as a result of this test you get the data as in the figure above: sent = 4, received = 4, loss = 0, then you did everything right.

A similar operation must be done from the second computer. Since you need to make sure that the packages come from it, too. Since there are times that an antivirus or Windows Firewall can block communication. Better yet, disable the Firewall at all during the setup and connection of two computers. After making the settings, you can try to turn it on (unless of course it does not interfere with the operation of this connection).

3. Next, through the "Explorer" window (calling the Explorer window: Win + E), enter the IP address of the second computer.

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Any local network - home or office - cannot do without connecting computers to the network using cables. And this is understandable, because this method of transferring information between computers is one of the fastest and most reliable. In principle, to build a local network for an amateur is difficult, but possible. Of course, the first question that arises is how to use it and how to connect a computer cable.

Types of computer cables

It should be noted right away that the monitor and the system unit are connected to the network via the power computer cable, which is supplied with this equipment. However, if damaged, it can be replaced with a PVA wire.

But in wired LANs, a special cable called “twisted pair” is used to transmit the signal. It consists of two or four pairs of twisted copper cores, which is why it got its name.

There are several varieties of twisted pair computer cable: unshielded version of UTP cable (Unshielded Twisted Pair), and shielded varieties having an additional foil screen - either common for all pairs (FTP - Foiled Twisted Pair), or for each pair individually ( STP - Shielded Twisted Pair).

The most common is the CAT5 category unshielded UTP cable or its slightly improved version of CAT5e. When installing a UTP cable of category 5 / 5e, it must be noted that all equipment: connectors, wall outlets, etc., must comply with this category. Otherwise, a poor-quality network link may form, which will lead to frequent failures.

Methods and options for connecting a UTP cable

Now let's talk about how to connect a UTP cable.

To create a local network, you need to prepare network cables. For this, two main options for crimping the cable are used: straight and cross (cross). Direct crimping is used in the manufacture of cables for connecting the network interface of a computer and other devices to switches or routers, as well as for connecting network equipment to each other. Cross crimping is used to connect directly two computers directly, without the use of switching equipment.

Twisted-pair crimping is the process of securing special connectors to the ends of the cable, which use 8-pin 8P8C connectors, which are usually called RJ-45 (although this is not true).

Before you start crimping the connectors, you need to measure and cut at a right angle the cable of the desired length. Then, on each side of it, remove the general external insulating sheath by 25-30 mm. It is important not to damage the own insulation of the conductors, which is located inside the twisted pair.

According to the selected crimping pattern, distribute the cores by color as shown in the diagram. To do this, you need to unwind and align the wires, arrange them in a row in the right order, press them tightly against each other and cut the ends with a crimper knife, leaving about 12-13 mm from the edge of the insulation.

Inside the connector for laying wires, 8 small grooves are cut - one for each core. Above them at the end are metal contacts. If you hold the connector with the contacts up and the latch toward you, then the first contact will be located on the left, and the eighth on the right. The pin numbering is important in the crimping procedure, so you need to remember the following: if you hold the connector with the contacts facing up and latched to you, the first contact will be located on the left, and the eighth on the right.

Now you need to put the connector on the cable so that the wires are not mixed up, and each of them entered its own channel. The cores must rest against the front wall of the connector. If the length of the ends of the conductors is processed correctly, they must all go into the connector all the way, and the insulating sheath must necessarily be inside the case.

Now it remains only to fix the connector at the end of the cable. To do this, insert the connector into the appropriate socket on the crimping tool and gently squeeze the handles all the way.

To make a direct network cable, it is necessary to crimp both ends of it according to the same scheme. In this case, it is possible to apply both version 568A and 568B (it is used much more often).

It is worth noting that for the manufacture of a direct network cable, it is not necessary to use all four pairs, two will be enough. In this case, using one twisted-pair cable, two computers can be connected to the network. However, it should be noted at the same time that the maximum speed of information exchange for such a cable will become 10 times lower.

In the manufacture of a cross (cross) cable, one end of it is crimped according to the 568A scheme, and the second - according to the 568V scheme and all 8 cores are used. At the same time, a crossover cable for data exchange between computers at speeds of up to 1000 Mbps is made in a special way. One end of it is crimped according to the EIA / TIA-568B scheme, and the other needs to be crimped in the following order: White-Green, Green, White-Orange, White-Brown, Brown, Orange, Blue, White-Blue. That is, in scheme 568A, the Blue and Brown pairs interchanged with the preservation of the sequence.

So, based on the foregoing, we can conclude:

There are two main options for crimping a cable: straight and cross (cross).

Having crimped both ends of the cable according to the 568V circuit (2 or 4 pairs), we get a straight cable to connect the computer to the switch or router. Having crimped one end according to 568A, and the other according to 568B, we get a cross cable for connecting two computers without switching equipment.

Joyner - RJ45 Connector Keg

This is the most common way today to repair or lengthen a twisted pair. It is most often used by installers and installers of Internet providers. This LAN connector looks like a small rectangular box with RJ45 connectors on two sides. Roughly speaking, the type of "mom-mom." Twisted pair is crimped into the connector from two sides and inserted into the joiner:

It is often called a splitter, but this is not entirely correct. The splitter has one input and two outputs. It is used to connect 2 computers using one 8-wire cable, using 4 wires for each.

Kapler (Coupler)

In my opinion, this is the most correct LAN cable connector - both from the point of view of cable management and from the aesthetic side: everything was done beautifully and neatly. The capler is made in the form of an opening box with 16 knife contacts. By the way, the same principle is used in power outlets. A cable is fed into it from both sides and is securely pressed into the knife contact with a screwdriver:

In general, it is much more convenient to do this with a special tool - a puncher. It looks like a knife with a special V-shaped blade. He evenly pushes the cores into the knife contact of the caper. Here is the simplest version of the puncher:

True, buying it for an ordinary user in order to extend the Internet cable at home once, of course, it makes no sense, because you can use an ordinary small slotted screwdriver. Such a twisted pair connection is held quite reliably and firmly. If it is used not in the room, but on the street, then it is better to wrap it with electrical tape so that water can not get inside.

The big plus of the kappler is that in order to connect or extend a twisted pair, absolutely no specific tool is needed - just a screwdriver and straight arms!

Normal power outlet

If a joiner or a kappler can not always be found in radio parts stores, then a regular external power outlet under the RJ45 connector can always be found. Even in electrical stores. Inside, such a socket consists of 8 knife contacts on one side and an RJ45 connector on the other:

Often one cable must be tucked into the knives with a screwdriver, in accordance with the color scheme. The second part of the cable must be crimped into the connector and inserted into the connector. Done! Here is a video instruction on how to do this:

Now you can buy a fairly compact outlet and as a result, the connection will look compact and aesthetically pleasing.

Scotch Lock Connector (ScotchLok UY2)

For those who are still a fan of twisting, there is a more modern option than just twisting the strands together. It is called Scotchlock. For work, no specific tool is needed - only pliers.

To connect the Internet cable to each other - we clean it from general isolation on both sides and lay it out in colors. We add color-to-color conductors to the adhesive tape. After they are tucked, we put on the cap of the connector on top and clamp it with pliers. The main thing is without fanaticism. The task here is not to crush Scotchlok, but to ensure that the veins enter the knife contact well. The result will be a spliced ​​network cable. Personally, I don’t like this type of connectors due to the fact that you don’t know where to put the resulting bouquet of cores and scotch blocks. Most often, in the hallways I notice that they just throw him hanging. As practice shows, sooner or later, someone will tear off one of the veins or the bullies will burn. I prefer everything to be compact and beautiful.

How to extend and connect the Internet cable at home: 11 comments

The first method is the most reliable.
Unless, of course, performed not so ugly - in a parody way!
By twisting, telephonists connect hundreds of pairs of cables.
Instead of electrical tape, 8 pieces of heat shrink tube, plus one on top.
Under the color of the cable insulation?
Connection for centuries and almost invisible!

open the standards and take an interest in twisting and adhesive tape is very bad and not acceptable

2016 in terms of wiring with aluminum conductors. The PUE and the Code of Rules prohibit the use of wires and cables with aluminum conductors, except in those cases about which I spoke a little above. Now, according to this Order, electrical wiring in apartments and houses can be safely performed both with copper cores and with aluminum, observing their minimum cross-sections, which are indicated in table No. 1 of this Order itself.

It seems we forgot what a soldering iron and shrink?)

Ivan - why, if possible easier, faster and at the same time reliable.

XasaH all the previous answers, well, except for you and Mikhail, not from the Signalers, but from ordinary people very very far from the field of communication. They do not even know and do not assume that there was a twist and will live for a very long time, that there are different digital and simple cables for the CCI cables, and 3M company still produces kits for twist couplings and for Scotchlock.
And I congratulate all the signalmen on their professional holiday, Radio Day.

Pavel, not cables, but cables)) Happy communication day, colleague!

Greetings! Tell me, why can not I increase the cable with soldering? You can twist, but no soldering? Or is this type of inconvenient: with a soldering iron under the ceiling, is 220V often not at hand? The speed of work again ... I need to increase 2 meters in the apartment for the first time in my life. The speed of work is not the main thing, the main thing is reliability and quality of the connection (it will be necessary to patch up the plaster). I know how to solder well. Is it possible or not?

Честно говоря, за всю жизнь не разу не видел, чтобы кто-то витую пару паял. Воспользуйтесь скочлоком и не мучайтесь.

Я паял, долго, но все прекрасно работает.для изоляции каждого провода и всей «байды » использовал термоусадку

Как связист скажу следующее — паяное соединение (паяная скрутка) самое надёжное и компактное соединение с наименьшим затуханием. Всякие виды клеммных и разьемных соединений ориентированы на удобство и скорость монтажа. Паять дело хлопотное поэтому если нет особых требований применяют скрутки и скотч локи. Only all non-greedy and technically literate people sticky tape locks, twists cleaned in special distribution boxes and couplings. Freely hanging twists and clusters of adhesive blocks are rather a sign of greed and unwillingness to bother.