Modern civilization provides a wide variety of benefits that make our lives easier. Among them are mobile phones and wireless. They help us hear the voices of our relatives and friends, friends and acquaintances at great distances, without using wires in this case. However, today still ordinary landlines continue to be relevant. Although they are large and require connection via special conductors, these devices can be useful at home with a discharged mobile phone or if you want to chat, spending a small amount of money on a call (tariffs, as a rule, are lower in this case). If you decide to connect such a phone or are just interested in this topic, then you should find out more information on how to check the voltage in the telephone line.
Stress concept
Before answering the question posed above, you should understand the concept of voltage. It is a physical quantity that shows the work of the electric field, performed when the electric charge is transferred from one point to another. It is measured in volts (abbreviated "B" in the Russian version and V in English).
Types of telephone communication lines. Principle of operation
Telephone communication lines are divided into two types: analog and digital. The first has existed since ancient times and is actively used today. It is relatively simple in functionality and also has stable settings (for example, voice pitch or volume). When we speak into the handset, the microphone converts our sounds into an analog signal, which is sent at lightning speed by wire to the central telephone exchange. She digitizes the received data. The result is all the same as we said, but only in a processed and improved version.
Thanks to such actions, the station clears the voice from interference and other noise, making it better. Then the signal again becomes analog and is already transmitted to the device through which the other person is listening. That is, we see that the first type of signal is used more often, and just the same it is used in the landline phones of our houses and apartments. So it's time to talk about voltage on an analog telephone line. We will learn about everything you need: from basic knowledge to incredible things about our topic.
What is the voltage on the telephone line?
It is no different from that which is in ordinary wires of the power supply network. More precisely, it has differences only in its size. The voltage in sockets, chandeliers, household appliances, switches and other devices is 220V. In a telephone line, it is much smaller, since very little is required of it. She does not need to power huge electric boilers or lighting fixtures. It only requires the transmission of voice over certain distances.
Therefore, you need to quickly answer the main question: "What voltage should be in the telephone line?". As a rule, it is 40-60V (in case the handset is on the phone). When a call is made to your stationary device, the voltage starts to change. Fluctuations can reach even 120V. The voltage in the telephone line when the handset is picked up, on the contrary, begins to drop sharply. In this case, it is 6-12V, which is quite small in size. However, if the cord of the handset is damaged, and you accidentally touch it, you can get quite an unpleasant sensation.
Determine the voltage of the telephone line yourself
Perhaps you someday decide to install a landline telephone at home. It is likely that you already have it, but for some unexplained reasons it has stopped working or is performing its tasks very poorly. In the first case (in order to choose a suitable device) and in the last (in order to correctly perform the repair) it is necessary to measure the voltage in the telephone line. This can be done using a special device called a voltmeter. It is connected in parallel and indicates the voltage in the form of numbers or using the arrow. Please note that this device is capable of showing the magnitude of the DC voltage (indicated by the “-” sign) and AC (the “~” sign). You will need to know the value of the DC voltage.
Learn the meaning in unusual ways
If you do not have a voltmeter (which is quite possible, because this is not an essential item), then specially for this case people experienced in this business came up with other methods for checking the voltage in the telephone line. The method is quite funny (at least it seems so at first glance), but very practical, easy and convenient. For its implementation, you will need a well-known vegetable - this is potatoes. Yes, it’s potato.
The root crop must be cut in half, then stick (preferably into the core of the vegetable) the two ends of the stripped wire to a depth of one to two centimeters. The distance between the two bare conductors should be very small. The main thing is that they do not touch, otherwise the network will close. And with potatoes the following changes should occur. Around the conductor, which is connected to the plus field, the flesh of the vegetable will turn green a little, and foam will form near the minus. In addition, the wire itself with a minus sign will become dark. This can be seen when you extract it from the vegetable.
Connect a new phone
As mentioned above, the voltage in the telephone line is usually checked when to install a new device or repair an existing one. Let's talk about connecting first. But before you begin this process, you need to consider the main types of telephone outlets. The first and most common form is RTShK-4. Communication is set up in this way: the socket contacts (the wires of the line are connected to them) must match the contacts of the plug (the wires of the phone are connected to them).
Socket 623K RJ-116P4C is a more modern option, but also outdated. It is used not only to establish telephone communications, but also to provide Internet access. Two line conductors should be connected, as a rule, to the green and red wires.
You can connect the phone without an outlet, using the RJ-11 plug. To do this, take the telephone line wire , strip its two contacts and insert them into the RJ-11 connector. The wire is clamped using special pliers (crimpers) or manually (for example, tapping the end of a flat screwdriver for the lamellas to the required depth).
Phone or telephone line repair
Consider the second case when using voltage measurement in a telephone line. We said that repair refers to this situation. A situation may occur in which the phone for some reason stops working. Then you should call the master: he will examine the device, find the cause of the malfunction, quickly and quickly fix it. Repair can be done on their own. This is where the methods of measuring the voltage of the telephone network help. With their help, it is easy to determine what specifically failed. The phone itself may have broken. In this case, the voltage will be OK. If it is absent, then, most likely, a breakdown in the communication line has occurred. Then you need to check the wire that goes to the outlet or the phone itself for damage. In the event of a malfunction, the wire should be replaced completely or directly at the site of failure.
Why else do you need to know the voltage of the telephone line?
Agree that you live in an apartment or house, stuffed with modern means, devices and other gadgets. All of them are somehow connected to the wires, because they can not work without electricity.
It’s probably still useful to know what voltage a particular conductor has, since we use these devices almost every day. Therefore, if you know the voltage passing through all the wires, then it is obvious that you can avoid danger. After all, a large electric discharge is capable of delivering a lot of unpleasant sensations to a person in case of damage to his carrier and contact with it. But in other situations, knowledge in this area and a firm belief in the inability of the wire for various reasons to electric shock will help maintain calm and good mood.
In conclusion
Thus, knowing the voltage in the telephone line, you can easily and simply install a new device, repair the old one, and avoid contact with bare conductors. It will also expand your horizons and erudition not bad, and you will have the opportunity to boast unusual knowledge to your friends.