How to connect 2 landline phones to each other. How to connect a telephone socket: connection diagram and installation rules

Despite the rapid decline in the popularity of landline telephones, there are not so many people who are ready to abandon them outright. Admit it, it happens that it is sometimes extremely difficult or even impossible to do without traditional communication.

To connect the device to the switching network, you need a low-current node, the installation of which you can handle with your own hands. We will tell you in detail how to connect a telephone socket without calling the wizard.

There is absolutely nothing complicated in the schemes and methods, and the useful information offered by us, as well as photos and videos, will help to deal with the issue.

The designs of stationary telephones are being modified and improved every year. And modern devices are significantly superior to their predecessors, favorably distinguishing themselves against the background of their high reliability and ease of use.

To ensure the smooth functioning of the device, two conditions are necessary:

Availability of a valid communication line from the automatic telephone exchange.
Possibility of electrical connection of a stationary device to this line.

The only thing that does not change in the field of telephony is the principle of operation of fixed telephones. However, there are significant changes in the designs and connection methods.

Old and new options for telephone switching are presented in the photo collection:

Image gallery

Of the tools for carrying out work, it is necessary to prepare:

building level;
crossover knife;
voltmeter;
screwdriver;
nippers;
lead pencil;
protective gloves;
Double-sided tape;
punch (if mounting a new point).

When choosing a screwdriver, they are guided by the type of surface and the dimensions of the screws used for fastening. To minimize the likelihood of electric shock, it is best to perform all manipulations with a screwdriver with an insulated handle.

Having outlined the installation point of the connection point, using a building level, they correct the horizontal and vertical position of its position

To connect a hidden-type socket, you must first make a hole in the wall for its installation -. This can be done using a perforator equipped with a special crown with a diameter of 60-70 mm.

In the absence of such, work can be done with an ordinary hammer and chisel. But manual labor will take much more time and effort. Then, to the hole made, it is necessary to grind a channel for laying a telephone cable.

There are certain nuances when installing a socket box in.

Stage # 2: Stripping the ends of the veins

Before proceeding with the melting of the wires, it is necessary to strip the ends of the wires, removing the outer layer. Expose the outermost 4 cm of the wires sufficiently.

When stripping a telephone cable, remember that it is very vulnerable to damage. Broken wires will only lead to equipment malfunction. Therefore, it is important to use specialized.

Since it is not always possible to accurately cut the first time, experienced craftsmen recommend making some margin along its length when laying the cable. The extra wire can then be hidden under the cover of the device.

Remove the protective insulation from the ends of the cable with extreme care, using a crossover knife, a sharpened blade or side cutters.

The task of the master is to strip the ends of the wires from the braid so that in their bare form they are intact and devoid of any defects.

Stage # 3: Connecting the outlet wires

The stripped wires with the strands apart are connected to the connectors of the box itself, focusing on the designations indicated on the front panel of the indoor unit. With a closed installation method, for the convenience of connecting, the wires are made protruding beyond the wall plane by 50-80 mm.

To observe the polarity when connecting the wires, they are guided by the rule: red insulation on the line with a "-" sign, and green braid with a "+"

If the rule is not followed, taking into account the polarity, there is a great risk that the telephone will malfunction from time to time during operation.

At this stage of work, a voltmeter is required. With its help, you need to check the readiness of the communication line. The line voltage should be between 40-60 volts.

The supplied cable cores are applied to the clamp and tightened tightly with special screws, ensuring a secure fixation. The shape of the grooves to which the conductors are attached facilitates the installation process. It is not necessary to wrap the joints with electrical tape.

When connecting devices, the design of which is equipped with four pins of a fork shape, only the two center pins are activated

Performing open mounting, at the final stage, it remains only to close the housing cover with a latch and secure it with screws. The finished socket is attached to the wall or floor, "planting" it on double-sided tape.

With a closed installation method, making sure that the wires do not intertwine in the socket box, according to the applied markings, the indoor unit is mounted into the wall. After giving the block the desired position, the structure is fixed with spacer screws and self-tapping screws.

At the final stage, it remains only to eliminate the gaps between the socket and the wall, covering it with plaster mortar, and also to close up the channels with the laid telephone cable.

After the gypsum is at the desired strength, the protective bezel is replaced and the bezel is attached. In modern devices, the protective bezel snaps into place on the indoor unit, and the front panel is fixed by screwing in the screws.

There is nothing difficult in connecting a telephone socket. The only thing is that you should not save money by purchasing equipment of a low price range. It does not always comply with the standards and can fail even at the connection stage.

Share your personal experience of connecting a telephone socket, leave comments on the article and ask questions. The contact form is located below.

Telephone is an electrical device that allows people to exchange information at a distance using an electrical signal. The word telephone comes to us from ancient Greece. Tele - translates as "far", and the background - "voice".

After reading the article, any home craftsman can easily connect a landline, fax or several phones in parallel, including a radiotelephone.

What is the voltage in the telephone line

The telephone line is under 40-60 V DC voltage if the telephone is not connected or is connected, but the handset is on the telephone set. During a call, the voltage in the communication line becomes variable with an amplitude of up to 120 V. When you pick up the handset, the voltage drops to 6-12 V. This voltage is not life-threatening, but it can cause unpleasant sensations.

It is impossible to disable the communication line or damage the telephone set when connected. The telephone line may be disconnected for several minutes if the handset is lifted for a long time without dialing a number or if the communication line conductors are short-circuited. The telephone line is automatically disconnected by an automatic telephone exchange (ATS) to save energy. So you can safely start connecting your phone to the communication line on your own.

Before connecting a landline telephone, fax or radiotelephone to the communication line, it is advisable, but not necessary, to check the availability of the communication line. Line voltage can be measured with a voltmeter designed to measure DC voltage.

If the phone is not connected to the line or is connected, and the receiver is on the phone, the device should show a voltage of 40-60 V. If there is no voltmeter, you can check with a potato, and this is not a joke, but a real way of checking. It is enough to stick the noodle wires stripped from the insulation into the cut of the potato. No batteries are needed as the wires are already energized.

What current will flow
in case of short circuit of telephone line wires

The automatic telephone exchange has a system of protection against failure of equipment and communication lines, which limits the current in case of a short circuit of the telephone line to 40 mA.

For the communication line, one of the free pairs is taken, brown or blue. A twisted pair cable consists of two conductors twisted together. The insulation of one of them is painted in a solid color, and the insulation of the second is white with stripes in the first color.

Hello, dear lovers of experiments and experiments with their own hands!

We have already touched on the topic of telephone communication on the pages of a blog about science and technology with our own hands. Then it was about a phone made of plastic cups. Unfortunately, such a phone very well demonstrates some laws of acoustics, but in practice it can only be applied in fairly ideal conditions - the phone's thread should be taut and should not touch any obstacles. And the length of the thread is limited. An ordinary wired telephone is another matter. There is no doubt about its applicability. Despite the spread of mobile communications, it will not soon be ousted from apartments and offices. We will talk about it, and at the same time we will build our own simplest telephone network, devoid of the above disadvantages.

Did you know that telephone communication dates back to the 19th century, and since then the fundamental design of the telephone has remained practically unchanged? This is indeed the case. Of course, the details of the telephone have changed - a modern telephone set includes electronic components that simply did not exist at the time of invention. Automatic telephone exchanges function in telephone networks, which switch subscribers among themselves. Various telephone services have appeared. However, the purpose of the telephone set of any scheme has remained unchanged since its invention by Alexander Bell in 1876 - converting sound into an electrical signal and transmitting it through a communication line to the desired subscriber and converting it back into an audio signal. And in this classic telephone communication there is no equal.

To demonstrate this claim, let's compare the aforementioned plastic cup phone to a regular telephone network. We have already spoken about the disadvantages of the first one - this is a short range, the absence of obstacles in the path of the communication line, and ensuring the tension of the thread. In addition, let's estimate the speed of sound propagation in the first and second types of communication. So, the speed of propagation of a sound wave in iron is about 5000 meters per second. Even if we found a way to eliminate the attenuation of the sound wave, the sound, say, from Moscow to Vladivostok would go 30 minutes! I don’t know about you, but I would quickly get tired of such a phone - the radio signal reaches Mars faster! Another thing is the speed of propagation of an electrical impulse - 300,000 kilometers per second. There is no better intermediary for sound transmission. You just need to come up with a way to convert a sound wave into an electrical signal and vice versa. And such a method was found by Alexander Bell.

In his telephone set, the sound signal was converted into electrical impulses, which through the wires reached the opposite device and there they were converted back into a sound signal. Everything turned out to be as simple as ingenious! Of course, the first telephone network had no telephone exchanges, no dialers, or other modern telephone charms. There were only two telephones connected by an electric wire. I suggest you check the possibility of the existence of such a telephone network. Moreover, such a telephone connection is quite realistic to use in practice, for example, to telephonize a home workshop. And if you hold such a phone to the place where your child is playing, then it will remain a key link in many games for a long time.

So, we need:

two telephones;
electrical wire.
constant current source.
telephone patch cord.

As for the electrical wire - you don't have to limit yourself here - any length of telephone wire can be used for your experimental or household needs. The type of wire can also be almost any. I used 30 meters of twisted pair in my experiments.

As for the direct current source, the following can be said. In the telephone network, the line voltage at rest (on-hook) is 60 volts. But for our experiments, the voltage from two batteries of the "Krona" type will be quite enough. You can also use a 12-20 volt power supply.

Take the patch cord and cut it in half.

We clean the ends. The veins of a patch cord are often very thin; it can be inconvenient to peel them off with a knife. You can burn them.

In the case of using batteries, we connect them in series. It is convenient to use clip-contacts, but you can do without them.

We include our current source in the circuit in series, that is, in the break of one of the wires.

Do not forget to isolate contacts.

Everything, you can use it! The only significant drawback of such a scheme is the inability to call a subscriber. To provide such a possibility, it is necessary either to provide an AC voltage supply to the line, as is done in urban networks, or to lay an additional line to provide a sound or light call.

A situation often arises when the question becomes relevant: "How to connect two phones to each other?" For example, you need to copy a large file with a video or program from one phone to another. Or move a large amount of music and photos. In addition to the traditional sending of files via Bluetooth and Wi-Fi channels, there are several more methods. This article will show you how to connect two smartphones with a USB cable.

Can smartphones be connected with a cable?

In order to connect two phones with a cable, you need to have a micro-USB to USB cable and a USB-female adapter for "OTG" in stock. For starters, it's worth noting that only phones that support One-touch-Go (OTG) can be paired. Thanks to this technology, you can connect any peripheral device to your smartphone, including a second phone.

USB adapters can be marked "master" or "slave", that is, they can be master and slave. If there is an adapter marked "master", then the phone with this adapter will be the main one, and the second phone will be displayed on its screen as a removable medium. If the adapter is marked "slave", then the situation will be mirrored.

All modern smartphones support OTG technology. It was designed to connect keyboards, webcams, removable media, printers, mice and other peripherals to Android devices.

To connect two phones, you first need to connect a USB-female adapter to one phone, and a micro-USB cable to the second phone. After the phones have identified the cable and adapter, you can safely connect them together.

There is no need to use additional software when connecting two phones. For this, the interface of a standard smartphone file manager is sufficient. In this case, the content of the slave phone is displayed in the file manager of the main phone as the contents of removable media. After connecting the phones with a cable, you can copy files at high speed and not worry about a possible disconnection or loss of data, as is the case with data transmission via the "Bluetooth" channel.

How to connect a smartphone to a tablet?

Today, tablets are no less popular than smartphones. And therefore, the question of how to connect a tablet to a phone with a USB cable arises quite often. Moreover, most modern users often have both of these devices. And sometimes it is very necessary to quickly copy a large amount of information from one of them to another.

As in the situation with two phones, a micro-USB to USB cable and a USB-female adapter for the "OTG" function will come to our aid. But some tablets already have a built-in USB interface. In such a situation, the task is simplified: you only need a micro-USB to USB cable to connect. Just remember that the built-in USB-female is often labeled "master" by the manufacturer, and take this into account when connecting.

Once you know how to connect your phone and tablet via a USB cable, transferring information between the two devices becomes even faster and more reliable. Of course, in the world of wireless technology, this capability is not always necessary. But situations happen differently. For example, the Wi-Fi adapter is broken on one of the devices. Then data transfer via the USB interface will be the only and no less reliable way.

Having two telephones, a coil of two-core wire of sufficient length and a small number of radio components, you can organize your own telephone line for two subscribers. For example, to arrange a connection between two neighboring apartments by throwing a wire between the windows, or between neighboring country houses, between the house and the gazebo. First of all, let's recall from the school physics course how the telephone works. In the simplest case, these are two telephone capsules connected by a two-wire line.

When one speaks in front of one capsule, its magnetic membrane moves from the sound waves and induces some alternating voltage in the coil, which is fed through wires to the coil of the second capsule and sets its membrane in motion. It turns out that the membrane of the second capsule moves in the same way as the first, creating sound waves that can be heard. But theoretically, such a connection is ineffective, too large losses in the wires and low efficiency of the capsule.

Therefore, a real telephone has a carbon microphone, the impedance of which changes in time with speech. In addition, some constant voltage is applied to the line. As a result, it turns out that a carbon microphone connected to the line, changing its resistance in time with speech, causes a change in the current in the line.

Thus, an alternating current is obtained in the line, which changes in time with speech. This current feeds the capsule of another telephone and emits sound waves, quite distinct and loud.

A schematic diagram of the simplest telephone line is shown in the figure. Two electronic telephones are used - handsets with push-button dialers, but you can take simple
disk devices. They are connected by two wires. A constant voltage of 60-80V is supplied to these wires through the resistance R1. When the tubes of both TA are hung between these wires, there is a voltage of 60-80V, since in this state the internal resistance of the TA is very high.

Suppose we pick up the receiver TA2, while its hook switch connects its talking unit to the line and the resistance of TA2 decreases sharply, so much that the voltage in the line drops to 8-10V (the voltage drops because from the resistor R1 and the resistance of the talking unit TA it turns out voltage divider, and the line turns out to be connected just through this divider).

If you start talking in front of the TA2 microphone, the resistance of its spoken node begins to change in time with the speech, which means that the total resistance of TA2 also changes. At the same time, R1 remains unchanged and the voltage in the line changes in time with speech. The TA1 telephone set is also connected to this line and if you pick up its receiver you can hear what is being said in front of the TA2 microphone. If the TA1 subscriber answers, his voice will be heard by the TA2 subscriber. This way you can talk to each other.

To call a subscriber, the telephone set has a bell or a buzzer, it is connected to the line whenever the TA tube is hung up and reacts to any significant voltage drop in the line. If you pick up the handset TA2, then the TA1 call will "ring" once, because there was one voltage drop in the line, hang up - TA1 will "ring" again.

As part of the TA there is a dialer, push-button or disk, it does not matter, in any case, it serves to create voltage drops in the line, these drops are received by the telephone exchange, counting them and thus determining the subscriber's number. In our case, there is no telephone exchange, but the dialer can be used to call a subscriber. If you dial the number "9", the TA creates nine voltage drops in the line, which means that the second TA will "ring" not once, but nine times, if the number "0" - ten times.

Thus, in order for you to call your friend on TA1 from the TA2 phone, you need to pick up the TA2 handset and dial "O" (or another number) several times in a row. As a result, TA1 will ring, your friend will hear the call, and after picking up the phone he will be able to talk to you. Similarly, you can call TA2 from the TA1 device.

The constant voltage for powering the line is obtained from the mains voltage 220V using a transformer T1 and a rectifier on diodes VD1-VD4. The ripple of the rectified voltage is smoothed out by the capacitor C1. Transformer T1 can be made from a small-sized transformer from a mains source to power toys or portable equipment. It is necessary to disassemble the source body and connect the transformer with an extension cord to the network to measure the voltage on its secondary winding. Suppose the voltmeter showed 6V.

We need 50 V. Now we disconnect the transformer from the mains, disassemble its lamellar core and unwind the secondary winding (not mains winding), carefully counting its turns. Let's say we counted 120 turns, this one despite the fact that the output voltage was 6V. Now we calculate how many turns a given transformer has for 1V: 120/6 = 20, a total of 20 turns. We need 50 V, which means that the secondary winding must contain 20x50 = 1000 turns. We take a thin winding wire, for example PEV 0.06 or PEV 0.09, and carefully wind 1000 turns with this wire instead of the old secondary winding.

Then we assemble the transformer core. You can take a ready-made transformer that produces at least 36V and at most 50V.
D226 diodes can be replaced with any rectifier, for example, D7 or modern KD102, KD103, KD105, KD226, KD209. Capacitor C1 for a voltage of at least 100V and a capacity of at least 160 μF. Resistor R1 with a resistance from 1 kOhm to 1.8 kOhm for a power of at least 2 W. S1 toggle switch of any type.

Structurally, the power supply can be connected to the line anywhere, near TA2, near TA1, or even in the middle. For example, if TA2 is in an electrified room, and TA1 is in a garden gazebo, it is clear that the source is connected near TA2.

During installation, do not confuse the polarity of the connection of the capacitor C1 and the diodes. For D226 diodes, a graphic image of the diode is applied to the body, along the body, so that you can understand the purpose of the terminals.