Types of cables used

Various twisted pair options can be used to connect outdoor and outdoor cameras. Below we will consider the features of each of them.

This is an unshielded cable that has no shielding, and PVC-compound is used as an outer protective sheath.

This type of cable can be used for analog camera in the absence of external electromagnetic interference.

It is a cable with good electromagnetic shielding. He owns a common screen, and each of his 4 pairs of twists also has additional screening.

connecting, cctv, camera, twisted, pair

Twisted pair cables UTP and STP

Additional overall braiding can be copper or steel and is located under the outer insulation layer on top of all strands.

The cable is suitable in cases where the video signal is loaded in an environment with significant electromagnetic interference.

Twisted pair has 4 strands of conductors, which are protected by a common screen located under PVC insulation.

Video data transmission network structure

If the distance between the video camera and the recording device is small, and all the equipment is inside the building, you can do without additional amplifiers and grounding devices. In this case, the transmission is carried out over a conventional patch cord with a length of 150-200 m.If the transmission range of information exceeds 150 m, then part of the cable must pass outside the buildings, and the network acquires the following structure:

  • The transmitter is a compact device that is located in the immediate vicinity of the CCTV camera. As a rule, they are installed inside the thermo-housing or in a special compartment of the terminal box. Converts a unipolar asymmetric composite video signal into two antiphase symmetric ones, which are more suitable for long-distance transmission without attenuation;
  • Receiver. located directly next to video recording devices. video recorder, video server. Performs the reverse transformation of information that comes from the transmitter.

Principle of operation and features of functioning

Data transmission over certain distances, regardless of the channel used, is subject to various interference. This interference gradually drowns out the useful information signal. When its strength drops to the level of interference, it is almost impossible to distinguish and isolate the necessary data from the general background.

The twisted pair is a symmetrical line by its principle of operation. In such connections, interference is also transmitted symmetrically during data transmission. And when they converge, they are mutually destroyed, due to which the main data is easily recognized.

This principle of operation is ensured by a special design of the line, which, in addition to the cable itself, also includes a transmitter-receiver pair. Of this equipment, the transmitter is responsible for receiving and converting the unbalanced signal of the video camera into a balanced one. Then it is amplified and sent to the receiver. At the receiver, the signal is re-amplified and converted back to single-ended form.

But this scheme also has a couple of nuances. Even this method of transmission, although it allows you to neutralize interference, still does not exclude the weakening of the useful video signal. The transmission range in such systems is 50 Hz. 6 MHz. And since the channel capacity is much larger, the signal is fed unevenly. over, the higher the frequency of the transmitted video signal, the more it weakens. In addition, the degree of attenuation is also directly proportional to the range of the line used.

As a result, we can conclude that this transceiver format, which is also called passive, is suitable only for small cable infrastructures. Over longer distances, active equipment is better at transmitting. Such equipment includes various versions of jumpers or trimming resistors. With their help, two types of signal strength adjustment are carried out:

  • By means of a jumper. step-by-step adjustment;
  • The resistor adjusts the line more smoothly.

The first type of equipment is quite easy to use. After calculating the total length of the line, jumpers are mounted on precisely verified segments, which amplify the signal. Of course, there is no need to talk about fine tuning here, but for most surveillance systems, they are quite enough.

A trimmer resistor is capable of providing a finer setting. But it is possible only if additional equipment is used. At the same time, not every master can carry out the adjustment of such a scheme.

Having implemented the above measures and having properly configured the system, the range of signal transmission over twisted pair can be increased from the standard 2 km to 3-4 km.

It is very easy to connect an analog video camera via twisted pair. To do this, you need to 0determine the color of the required pairs for connecting the transceiver and the power plug from the side of the video camera and duplicate the sequence at the end of the line from the side of the DVR and the power source.

The voltage supply over the twisted pair is correct for a distance not exceeding 30 meters. With an increase in the distance beyond 30 meters, a voltage drop will begin due to the small cross-section of the cable.

Range and signal transmission rate

Twisted pair is characterized by the ability to transmit signals over long distances and at higher speeds. Provided that a special amplifier is used, there may be no signal loss at all.

As for coaxial transmission lines, their operation, and accordingly the signal attenuation coefficient, will be influenced by many factors, the effect of which cannot be excluded. This is the quality of the metal used, and the cross-section of the conductor, and the external temperature, electromagnetic interference, etc.

Why do you need receivers and transmitters?

Due to its technical characteristics, the twisted pair has a very high resistivity, which negatively affects the transmission of the video signal over a distance of more than 200 meters, therefore, if it is necessary to organize video surveillance over long distances, special transceivers are fixed at both ends of the cable, of which there are 2 types:

  • Passive transceivers;
  • Active transmitters.

Transmitters are installed on the camera side and receivers on the receiving equipment side.

Passive transmitters are used to transmit video signals over short distances. 150-500m, since they are not able to compensate for all interference. The main feature is that this type of device does not require power supply to operate.

For long cable lines, active transmitters are used, capable of transmitting a signal over a distance of up to 4 km, depending on the specification. For active transceiver devices to operate, a 12V power supply is required. With the correct organization of the system, the transmission range can reach 3000-4000 m.

To successfully organize video surveillance using these technical hearts, the following rules must be observed:

  • Use only compatible receivers and transmitters;
  • To achieve the best result, only active transceivers should be used, preferably with the ability to adjust the gain (adjusting the frequency response. amplitude-frequency characteristic);
  • Use cable with minimum capacitance between conductors.

The signal can be attenuated both due to the line resistance and due to the cable capacitance due to the transmission of a high-frequency signal, and since twisted pair is used to organize video surveillance over long distances, we need to minimize the risk of signal loss by amplifying it. It is to amplify the signal from the camera that active transceivers are used.

Since the frequency range of the signal is quite wide, the attenuation can be uneven. to ensure minimal differences between the image on the monitor and the image from the video camera, high frequencies must be amplified more than low frequencies. To do this, it is necessary to correct the frequency response, which can only be done using active receivers and transmitters.

SF / UTP

This type of twisted pair does not have individual shields for individual twists. The shielding is provided by a common screen in the form of a foil and a braid, which are located under the outer insulating layer. The cable is suitable for connecting an analog and IP camera, providing high-quality video signal transmission.

Twisted pair wire SF / UTP

The above cables can be produced in solid or multi-core versions. A single-core cable is not used for laying long routes that load video from CCTV cameras.

For this task, a multicore twisted pair is better suited, but provided that a video signal amplifier is used, which neutralizes signal losses when loading over long distances.

Connect CCTV Camera using Cat6 cable

Advantages and Disadvantages of Analog Cameras

  • Most of the cameras produced and almost all the old-style devices have rather limited functionality, but this problem is solved in new models that have received a hardware Motion Vector, built-in microphone and speakers, or a connector for their connection;
  • There are certain restrictions for integration with digital security systems and access control systems;
  • Video signal is not encrypted during transmission.
  • Difficulties in scaling and transitioning the system to digital technologies.

Twisted-pair analog video surveillance: the principle of signal transmission

Principle of operation and features of functioning

Data transmission over certain distances, regardless of the channel used, is subject to various interference. This interference gradually drowns out the useful information signal. When its strength drops to the level of interference, it is almost impossible to distinguish and isolate the necessary data from the general background.

Connect CCTV camera to DVR using video baluns and UTP cable

The twisted pair is a symmetrical line by its principle of operation. In such connections, interference is also transmitted symmetrically during data transmission. And when they converge, they are mutually destroyed, due to which the main data is easily recognized.

This principle of operation is ensured by a special design of the line, which, in addition to the cable itself, also includes a transmitter-receiver pair. Of this equipment, the transmitter is responsible for receiving and converting the unbalanced signal of the video camera into a balanced one. Then it is amplified and sent to the receiver. At the receiver, the signal is re-amplified and converted back to single-ended form.

But this scheme also has a couple of nuances. Even this method of transmission, although it allows you to neutralize interference, still does not exclude the weakening of the useful video signal. The transmission range in such systems is 50 Hz. 6 MHz. And since the channel capacity is much larger, the signal is fed unevenly. over, the higher the frequency of the transmitted video signal, the more it weakens. In addition, the degree of attenuation is also directly proportional to the range of the line used.

As a result, we can conclude that this transceiver format, which is also called passive, is suitable only for small cable infrastructures. Over longer distances, active equipment is better at transmitting. Such equipment includes various versions of jumpers or trimming resistors. With their help, two types of signal strength adjustment are carried out:

  • By means of a jumper. step-by-step adjustment;
  • The resistor adjusts the line more smoothly.

The first type of equipment is quite easy to use. After calculating the total length of the line, jumpers are mounted on precisely verified segments, which amplify the signal. Of course, there is no need to talk about fine tuning here, but for most surveillance systems, they are quite enough.

A trimmer resistor is capable of providing a finer setting. But it is possible only if additional equipment is used. At the same time, not every master can carry out the adjustment of such a scheme.

Having implemented the above measures and having properly configured the system, the range of signal transmission over twisted pair can be increased from the standard 2 km to 3-4 km.

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Connecting an analog video camera via twisted pair

Analog video surveillance over twisted pair is created by connecting transceivers to the line.

A huge advantage of a twisted pair cable over a coaxial cable is the number of connected video cameras. One 4-pair Lan cable can be used to fully connect 2 video cameras, i.e. simultaneously supply a signal and voltage.

It is very easy to connect an analog video camera via twisted pair. To do this, you need to 0determine the color of the required pairs for connecting the transceiver and the power plug from the side of the video camera and duplicate the sequence at the end of the line from the side of the DVR and the power source.

Features of the choice of equipment for twisted pair

Effective operation of this type of device is only possible if the correct components are selected. To do this, you should follow these tips:

  • It is desirable that the receiver or transmitter include an induced voltage or atmospheric electricity protection unit.
  • The product in question must contain information about the operating voltage, the permissible temperature range, compatibility with other types of equipment.
  • If you plan to purchase an active transmitter and receiver, they must definitely include regulators for setting up the device.
  • As a “plus”, you can also consider the marks of the type of characteristics of the protection system, frequency range and others. Of course, without proper qualifications, these designations will not say anything. But, on the other hand, they testify to the quality of the product.
  • Do not believe statements such as “720p image quality will not change even when transmitted over a couple of kilometers.” When transmitting a twisted pair cable over such a distance, insignificant loss of quality is an inherent moment.
  • Also, when choosing a suitable version of a twisted pair, it is advisable to pay attention to its capacity. reliable and efficient will be the option in which this value is less.

How to connect an IP camera via twisted pair

To connect an IP video camera, rg45 connectors are used. Twisted pair for IP video surveillance can be either 2-pair or 4-pair. To connect any IP camera, two pairs of Lan cables are enough. Do not believe if someone says that the signal transmission will be better with a 4-pair cable.

To connect an IP video camera over long distances (for example, up to 150 meters), you can use a POE injector. To power the video camera via POE, it is necessary to crimp 4 pairs under the connector.

The maximum operating distance of an IP video camera over a twisted pair cable without a poe injector does not exceed 100 meters. To increase the distance of the IP video camera, it is necessary to install an Ethernet extension cable for every additional 100 meters.

Crimping 4-pair cable.

Crimping 2-pair cable

How to connect an analog camera to a computer?

and more people want to organize home video surveillance, because at the moment it is not too expensive and quite easy to do. For such purposes, you don’t even have to purchase and configure special equipment (for example, a stationary video recorder). It is enough to have a more or less modern computer, cameras, as well as an inexpensive video capture card or other equipment that allows you to output an analog signal to a personal computer.

In most cases, it is recommended to use digital cameras, since they have better image quality, less power requirements for the computer and the presence of additional devices, and are very easy to set up. But this option is not suitable for everyone, because some people already have good analog cameras, and there is practically no sense in changing them to digital ones. Analog cameras most often have a “tulip” connector, so they cannot be connected directly to a PC without using additional devices.

The main ways to connect analog video cameras to a computer:

  • Using a video capture card (internal or external). The connection will be via USB;
  • Through a stationary video recorder with the ability to display images via Ethernet or Wi-Fi;
  • Using a special converter that connects to the Ethernet connector.

Using a video capture card

One of the most common ways to connect analog cameras to a PC is to purchase a dedicated video capture card. What needs to be done in the process:

  • purchase a suitable video capture card. It must contain “tulips” to connect a variety of analog devices.
  • install a video camera (or several cameras) in the most convenient place.
  • connect the camera to the capture card with the appropriate wire.
  • install the drivers and software that come with the board. In the absence of such software, you will need to download it from the manufacturer’s official website.
  • display a picture on a computer monitor through installed applications.

After that, the image from all connected cameras will be recorded on the hard disk of the computer.

Connection using a fixed video recorder

If you have any recorder available for organizing home video surveillance, analog video cameras can be connected to it, after which the stream can be sent to a computer via an Ethernet connection.

How to display a picture from the recorder on a PC:

  • First, you need to connect all video cameras to the corresponding connectors on the recorder.
  • Connect the DVR to a PC network card or router via Ethernet.
  • On a PC, you will need to open a browser and enter the required IP address (you can see the standard IP and login with a password in the instructions for the recorder). Attention! It is strongly recommended to change the standard IP and login with a password in the settings in order to avoid hacking cameras by various intruders.
  • Enable recording from cameras directly to a personal computer.

Some registrars come with a complete software, in which case it is recommended to use it, and not a third-party Internet browser. First, it will greatly simplify the recording setup. Secondly, it will increase the reliability of the entire system.

USB connection

It is not possible to make such a direct connection, since USB is an exclusively digital connector, and an analog signal cannot be transmitted through it. Therefore, for users of laptops and all-in-ones, on which an internal video capture card cannot be installed, it remains to use an external video capture card (connected directly via USB).

Setting up an external video capture card and connecting cameras is exactly the same as with an internal device. There are practically no differences.

Which is better: desktop or laptop.

If you have a regular computer and a laptop, it is better to use a laptop to organize home video surveillance for the following reasons:

  • It is much smaller and more compact than a regular PC, so it can be placed on almost any surface.
  • The power consumption of notebooks is significantly lower than that of system units. If a stationary computer consumes 200-300 watts per hour, then a laptop barely consumes a hundred watts (more often this figure is much lower).
  • Laptops have a built-in battery, which will allow you to continue recording from cameras even if the power outage is not too long (some cameras also have a built-in battery).

Through special converters

To use one or two analog video cameras, you can use special AV-to-digital converters. At the input of such a device there are classic “tulips”, and at the output there is an Ethernet connector. How to connect in a similar way:

  • First of all, it is necessary to determine the number of cameras, if there are more than 2-3 cameras, then the use of converters is unprofitable in terms of cost and setup time.
  • Connect the camera to the converter, and this device directly to the network card of the computer or to the router.
  • Go to the Internet browser and enter the IP address of the device connected to the network card or router.
  • Set up a username and password, after which you can safely start video recording.

Connecting an analog video camera to a computer at home is not too difficult and time-consuming task, since there is special equipment and software for this purpose. The same video capture cards are quite cheap and will allow you to connect multiple cameras at once. Although it is better to use a full-fledged video recorder to ensure video surveillance at an enterprise, since no existing video capture card can cope with such an extensive task, and recording to an ordinary personal computer is not a sufficiently reliable business. Therefore, video surveillance organized through a regular PC is more suitable only for home use than for a serious organization.

How to connect an analog camera using a twisted pair cable?

How to connect an analog camera using a twisted pair cable?

As you know, analog video cameras are connected to a video surveillance system using a coaxial cable. But few people know that an analog camera can be connected to a digital video recorder using a twisted pair cable, which allows not only transmitting video to the recorder, but also supplying power to the cameras.

What is it for? It’s simple. You have a digital video surveillance system, but you have analog cameras in your hands and you want to expand your system at the expense of them.

It is clear that directly connecting an analog camera to a digital video recorder, router, or to a computer’s network card just won’t work. To do this, you need to purchase a special converter that allows you to convert the analog signal to the TCP / IP protocol.

Of course, with this connection, you cannot do without a twisted-pair cable with a standard pinout of connectors, where the crimping procedure is the same as when connecting an IP camera of other devices using this protocol.

It is rather difficult to connect an analog camera to a digital video recorder using a twisted pair cable. The problem is that not all analog-to-digital converters provide high-quality video and stable operation of the video control system. Only a high-quality converter will give a normal result.

So, you have such a converter and a twisted pair, in order to make the connection, you need to connect the analog camera to the converter using a coaxial cable. Next, we connect the converter to the recorder, router or computer network card using a twisted pair cable.

If a Category 5 cable without connectors is used, it must first be crimped according to the appropriate diagram. Remember that for connection to a PC the scheme will be “computer-computer”, for connection to a registrar or router “computer-hub”. When using a router, it may be necessary to open additional ports through the settings of the router.

When connecting to a PC or router, you need to open a browser and enter the IP address of the converter, which is indicated in the instructions or written on the case of this device. When using a registrar, this is done in its settings. Here it is imperative to change the standard IP, username and password so that your video monitoring system is not hacked by unauthorized persons. After changing these parameters, the system is ready for operation.

If you have a computer, you can make the settings using special video surveillance software. using a browser for video surveillance on a PC is not recommended.

How to connect an analog camera to a DVR using a twisted pair cable is shown in the video below.

But what to do if you have analog cameras and a similar recorder, but you need to use a twisted pair cable, for example, when there is no way to supply power to the camera, except using a cable with a core to transmit electricity.

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Let’s face it, this is even more difficult than in the previous case. But nothing is impossible. To do this, in addition to the converter, you will also need a receiver that converts the digital signal back to analog. You will also need to correctly configure both the receiver and the transmitter so that they interact with each other, otherwise the signal will not reach the recorder.

For everything to work normally, you need to purchase a receiver and a converter in one set, in which devices are already selected that are configured for mutual work. If this is not possible and devices from different kits are used, and even from different manufacturers, you will have to connect them to the PC via an rj45 network cable and configure the IP addresses of both devices.

The disadvantage of using twisted pair in fully analog systems is the high cost of the converters and the rather large loss of video quality due to double conversion of the signal. But when it is impossible to supply power to the camera, except with the help of a twisted pair, you have to go to this step.

The connection itself is carried out as follows:

  • Before connecting, you need to configure the converter and transmitter to the same IP address.
  • We install a video camera and connect it to the transmitter using a coaxial cable.
  • We connect the converter to the receiver via twisted pair.
  • We connect the receiver to the DVR.

How to connect cameras according to this principle is described in detail in the video.

Well, we would like to remind you that since 2010 our company “We’ll Record Everything” has been designing, installing, upgrading and maintaining any video surveillance systems and video intercoms and the Moscow region.

We work quickly, efficiently and at affordable prices. You can see the list of services and for them here.

Call 7 (499) 390-28-45 from 8-00 to 22-00 any day of the week, including weekends. We will be happy to help you!

Types of IP cameras

  • Cylindrical. Bullet.
  • Box (outdoor IP cameras). Box.
  • Dome IP Cameras. Dome.
  • Pan (controlled, high-speed). PTZ.
  • Square. Cube.

Cloud connection method

  • Buy a digital video device.
  • Connect the network cable to the camera connector.
  • A special utility is supplied with the device that determines the IP address.
  • Cloud service switch activation, device ID detection, portal login.
  • Select Cloud ID and enter the device code there.

Viewing online and video archives, video, sound and voice on the air, connecting to all video servers at the same time, viewing images online from different servers at one client location. Plug N Play technology, multiplatform (Android TV, Apple TV, Mac OS, Windows, Linux, Android, iPhone OS, Windows Phone), the ability to differentiate access rights.

High probability of information leakage, high for storage devices.

How to connect an IP video surveillance camera

You can secure your property using technology that connects to a PC. It’s not enough just to connect the device, you need to be able to configure it. An IP camera is a device that transmits a digital video stream over an Ethernet and TokenRing network using the IP protocol. The device is networked and has its own address.

Configuring the router for Internet browsing

  • The configuration will only work if the IP address is direct. If the provider provides a “gray IP”, then the connection will fail.
  • You need to know exactly through which device the camera is connected (for example, through a home router).
  • Configuring the program via IP Surveillance.

How to check if the camera is working

  • Open a browser, write in the address bar the IP address of the camera and its port as follows: http: //your_unique_domain.ddns.ru: 8081 or http: // your_static_IP_address: 8081.
  • When logging into the camera from a computer that is in the same local network as the camera with a router, enter a unique IP address in the address bar.
  • In the address bar of the browser, when registering different ports, a picture from the corresponding camera should appear.

If all settings were entered correctly, the system works correctly.

Connecting an IP camera to a computer

  • The camera is connected via a twisted pair cable and a network card.
  • When connecting 2 or more cameras, use a router.
  • Find the IP address on the camera label or view it using a special program.

Differences from analog and application

  • After the video frame is received from the CCD (English CCD) or CMOS (English CMOS) matrix of the camera, the image remains digital until it is displayed on the monitor.
  • Received from the matrix, the image is compressed using streaming (MPEG-4, H.264) or frame-by-frame (MJPG) compression methods.
  • The ability to transmit video frames at the required frequency (for some types it exceeds 60 frames per second).
  • Using large extensions, including megapixel ones (640×48, 1280×1024, 1600×1200 pixels).
  • The audio stream is transmitted over the network in parallel with the video stream.
  • Remote and uninterrupted operation without conflict with other devices (network cable connection).
  • Remote monitoring of technological processes.
  • Remote project management.
  • Visual verification of abnormal situations.
  • Promotion of travel and other services in the network.

IP cameras have a built-in web server. The devices can work with the Internet and Wi-Fi, and connect to WAN and LAN. They are assigned an IP address, which makes it possible to receive information from any computers that are connected to the Internet. Not only software is suitable for viewing images, but also common browsers.

How to connect a CCTV camera

Video surveillance is gaining popularity among apartment and private house owners. The installation of equipment is usually carried out by qualified specialists, but this can be done on your own. In such cases, you have to decide how to connect a CCTV camera. Having the necessary knowledge, you can not only connect yourself, but also make all the necessary settings for the video system.

How to connect a security camera to a computer

The scheme for connecting cameras to a computer is significantly different from connecting video cameras to a TV. Images are not only viewed, but also saved to the archive. This simple operation can be performed in several ways.

The first option is to connect a video surveillance camera to a monitor using a video capture card, without which any actions with a mini-camera are impossible. It is available in various modifications with the number of video inputs 4-16, which allows you to use them to connect IP cameras in the same number. This element is located inside the system unit in special PCI slots. Therefore, laptops are not suitable for such a connection.

The set includes a program with which to control cameras and process incoming images. Board specifications must meet minimum PC requirements.

In another embodiment, a video surveillance camera is connected to a computer using a video server that digitizes images. With this device, an analog camera is converted into a digital one. The device is equipped with a BNC input and a LAN output that makes it possible to wirelessly connect even to a laptop or phone.

The most low-cost video surveillance is performed with a USB converter, which is also capable of digitizing analog signals from a camera or mobile phone. This video equipment connects to a computer via a regular USB input, that is, the program is not required in this case. The poor quality of the images transmitted by the device is fully compensated for by its low cost.

There is a possibility of direct connection of a mini-camera to a computer monitor. In this case, a BNC-VGA converter is required, with which the signal is transmitted directly to the VGA input, which is equipped with each monitor.

How to connect a CCTV camera to a TV

The dome camera, which is equipped with video surveillance, can be connected to almost any TV, if it has an RCA connector. Among users, it is better known as tulip or composite connector. It allows for efficient transmission of images and sounds in both directions. Through these connectors, not only video cameras are connected to the TV, but also other devices. music speakers, players, etc.

You can test the capabilities of the TV using a regular webcam connected to an intercom. Thus, the operability of the simplest system and its capabilities are checked. The user clearly sees how video surveillance works in practice. Before starting the test, the webcam is turned on in the viewing mode, and the power is connected to the analog one.

When connecting a CCTV camera to a TV, pay attention to the colors of the connectors and the RCA cable. The color combination of tulips is usually standard, including red, white and yellow. The video signal is transmitted to the router through the yellow cable, and the red black or white is used to connect power and transmit audio. Some analog camera models come with only two cables for power and video transmission. Many devices are connected according to this scheme, in which the use of microphones is not provided.

When checking the TV, the connection of the video surveillance system must be respected in the mode of operation of the audio-video channel (AV) to which the camera is connected. If all actions are performed correctly, pictures will appear on the TV screen that fall into the field of view of the lens of the device.

Analog cameras connected directly to the TV will cost significantly less than digital equipment, and the image quality is just as good. Basically, television receivers are used to view live images from outdoor video cameras installed in a private house or apartment.

Connecting an analog CCTV camera

As a rule, the standard connection of video surveillance with analog devices is carried out through Rostelecom using connecting coaxial cables and a power supply. Most often, you have to solve the problem of how to independently connect a CCTV camera to the recorder or directly to the monitor. If the devices are located at a considerable distance, the quality of the cable must be high, ensuring stable video surveillance.

To supply power to cameras or a DVR, you can use any type of connecting wires connected to a common power source. The cable for connection at the ends is equipped with special connectors that connect with similar connectors of all video system devices. Analog devices connected through Rostelecom are often used for outdoor surveillance. CCTV cameras are connected in the same way as indoors. The red connector connects the power supply, and the yellow and white RCA connectors include cables that transmit the corresponding video and audio signals through this connection. The color scheme for each model may be different, but the general principles of connection will be the same for everyone.

If you connect an analog camera, the images will be broadcast on a separate monitor or TV screen. The connection is made using a pair of RCA cables directly connecting the corresponding video inputs and video outputs. The center conductor of the coaxial cable is connected to the video connector. Connecting an analog camera is easy as the colored wires cannot be confused.

How to connect a microphone to a security camera

Each video surveillance system includes a large number of components, among which mini-video cameras play a key role. If necessary, their functions can be significantly expanded by installing motion sensors, infrared illumination and other useful elements.

Often, a microphone is connected to an IP surveillance camera capable of capturing all the sounds that occur in the protected area. Therefore, many DVRs have inputs and outputs specifically designed for connecting audio devices. Microphones can be natively built into mini cameras or purchased and connected separately.

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Digital video surveillance cameras connected to a computer network and to the Internet through Rostelecom are a separate group of IP devices. In outdoor cameras installed outside, microphones are rarely used due to the negative influence of weather conditions and the environment. For these purposes, special devices are used that are resistant to high humidity and temperature extremes. Outside, it is better to use directional devices of increased efficiency that ignore extraneous noise, most suitable for a video surveillance device in the country.

Usually, the IP camera works in conjunction with the so-called condenser microphones. They have three wires of different colors for connection. The red cable carries voltage, the black cable serves as the ground, and the yellow cable carries the outgoing audio signal. The microphone connection depends entirely on the location of the mini-camera. If installed remotely, then a separate power supply will be required. Therefore, the signal transmission will be carried out over a shielded cable that protects against extraneous interference.

The microphone is connected to the recorder in the same way. For this, a coaxial cable or video surveillance transmission over twisted pair is used. For this purpose, they are connected to the jacks by means of RSA connectors. Each audio input of the recorder connected through Rostelecom is paired with the corresponding video channel.

How to set up video cameras on a computer

In order to maximize the correct operation of the installed IP video surveillance equipment, it is required that all components are configured. This procedure is carried out using free programs included in the set of connected and connecting devices.

There is a general order of the settings scheme, suitable for wired and wireless cameras working through a Wi-Fi router:

  • The “DVR-client” program is installed on the computer. After registration, you need to enter your username and password. Next, we enter the program and set up everything that is needed.
  • In the “Settings” option in the field where the text is entered, you need to select the “Add zone” parameter.
  • Several values ​​will be offered, from which you need to select the “Find device” command. Further, the program itself detects the recorder connected to the computer and all IP cameras connected to it.
  • In order to start viewing images, each device in turn is highlighted and fixed with the “Add” button.
  • Setting the recording format on the DVR is performed in the “Settings” menu.

Useful software functions that increase the efficiency and quality of a video surveillance system over the Internet:

  • The program allows the video camera to broadcast pictures via a Wi-Fi router online directly to the network.
  • When the motion sensor is turned on, the recording mode of the recorder is automatically activated.
  • Video can be recorded at intervals predefined and set by the user.

If the connection diagram in the system allows more than 10 mini cameras, the set of equipment can be supplemented with anti-thunder protection, uninterruptible power supplies, devices for recording and storing information. It is possible to check the performance of the Chinese video surveillance system with your own hands using special programs, for example, portscan.ru.

In the case of normal opening of ports and transferring them using a router to a virtual server, the test program will determine all video surveillance connections at home as normally connected and working.

How to connect a security camera to a computer

How to make a CCTV camera from a phone

TWISTED-PAIR VIDEO SURVEILLANCE

It makes sense to consider the topic of the twisted pair cable, touched upon at the beginning of the article in more detail. The fact is that due to the ability to successfully resist induced interference, video surveillance systems over twisted pair can provide much longer ranges than equipment connected via coaxial cable.

For such a connection, conventional analog CCTV cameras plus transceivers are used. Actually. on the side of the camera. transmitter, and on the side of the observation post. receiver. When organizing video surveillance in this way, you should adhere to the following rules:

  • receiving devices. gears must be compatible with each other,
  • use only active (power-demanding) equipment,
  • it is desirable that it has the ability to adjust the gain (frequency response correction),
  • use a twisted pair with the lowest possible capacitance between the wires.

Now. a few explanations to what has been said.

Since the connection of a CCTV camera via twisted pair has the goal of providing a transmission range of about 1000 meters or more, we need to minimize the level of the useful signal. Where can he go? At low currents, losses due to line resistance are not very significant. serious wire-to-wire leakage due to cable capacitance as we transmit a high frequency signal.

In any case, the signal will be attenuated, so it should be boosted. that is why active transceivers must be used for twisted pair. However, amplification. That’s not all. The video signal covers a wide range of frequencies, so the attenuation will be uneven within this range. Amplitude correction is needed. frequency response (AFC), which, again, can only be provided by active equipment.

The last in this section. if you are an advanced installer, then you probably don’t need this material. If you independently install your first video surveillance system, then for the convenience of adjustments it is not bad if the connected equipment has discrete (preset) settings for lines of different lengths.

CONNECTING A CCTV CAMERA

There are two main ways to connect a CCTV camera.

  • Coaxial cable (for video surveillance, it has a wave impedance of 75 Ohm) directly to processing devices (monitor, video recorder, multiplexer, quadrator, etc.).
  • Twisted pair (transmitter and receiver used).

The second method (the diagram is shown on the left) is used when the camera is far from the video signal processing devices.

It should be noted that the transmitter-receiver pair also converts the signal to match the coaxial cable (unbalanced link) with the twisted pair (balanced link). A twisted pair can be a specialized cable, TPP wire (vole). The optimal number of turns per meter of line is 20.

The supply voltage can be connected with a separate wire, for example, ball screw, or you can use a combined cable that combines a coaxial cable with power wires. True, the combined cable for video surveillance in installation is somewhat inconvenient. I want to draw your attention to the fact that when applying power, when choosing the cross-section (length) of the wires, you should take into account the voltage drop across the connecting line (see Ohm’s law).

CAMERA CONNECTORS

For analog cameras, BNC connectors are used. Various designs can provide a BNC socket for video signal, plus. a separate connector for supplying voltage (directly on the case or on a flexible lead). option 1.

In the absence of special connectors (3 flexible wires are displayed), the connection diagram of option 2 is used. The colors of the wires are given in the passport, most often used

  • black. common
  • red- “” power supply
  • yellow (green, blue). video signal.

Note that if the common wire is one, it is common for the signal and supply voltage. The supply voltage can be 12 Volts DC. more often, 220 Volts AC. less often or 24 V DC.

BNC connectors for cameras are structurally according to the connection method: threaded, soldered, crimped, screw. The most difficult connectors to install are soldered, much easier for a screw (justified if the central core is flexible), crimping requires a special tool. I consider the threaded connection of the connector to be optimal, however, the connection for soldering is more reliable.

Several photos of the process of connecting CCTV cameras can be found here.

The last figure conventionally shows the main elements of the cable and connector, their mutual pairing.

VIDEO SURVEILLANCE CABLE

We immediately cut off the topic of IP systems. they use twisted pair cables of various categories for local area networks. The choice here is quite limited and should not be difficult.

For analog video surveillance systems, there are two main types of connecting lines:

  • coaxial cable,
  • twisted pair wire.

Let’s start with the latter. “Vitukha” used in network systems for analog equipment is far from ideal. Omitting theoretical calculations and calculations, I will immediately give a practical conclusion. in this case, it is best to use a CCI telephone cable to connect the equipment. With this, albeit concisely, but figured out. go to coax.

Here, too, everything is ambiguous. Coaxial cable is designed to transmit a television signal. that is, a high frequency and a fairly narrow band. The video signal spectrum is much wider and starts from 50 Hz. Therefore, the specific technical characteristics of this cable will give us little. Thus, we use the following criteria:

  • the central core of the cable and its braid should ideally be copper,
  • the larger the cross-section of the center conductor. all the better,
  • characteristic impedance should be 75 Ohm.

Further, there are “little things” that we will walk through in passing:

For our video surveillance system, you can choose a combined cable, that is, coaxial, combined with an outer layer of insulation with power supply. Its use is advisable if the power supply is installed in the immediate vicinity of the DVR. Otherwise, the cable of this design will have to be cut to a considerable length or use additional switching devices, and from them lay ordinary power wires.This is laborious and inefficient.

For outdoor laying of switching circuits for video surveillance, you should choose a coaxial cable for outdoor use, that is, of the appropriate temperature range and moisture resistance. This, however, does not eliminate the need to seal the joints and inputs. quite obvious thing.

This is the main thing that can be said about the choice of cable for connecting cameras of analog video surveillance systems.

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