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Two-wire video intercoms use only two wires to transmit video and audio signals, which simplifies installation compared to complex multi-wire systems. Various options are available based on function, room, outdoor unit compatibility, and advanced tech features. Below are some common types:
Basic 2-wire video intercom systems
This is the most basic intercom that allows effective communication and a video view of the area/door in question. It is however a simple version, with basic audio communication and a video aspect that offers only a daytime view, with no additional features. This boxy intercom can be used when budget constraints rule out more expensive models. Still, it won't give much convenience because the screen is small, and the camera has low resolution.
2-wire video intercom system
This intercom adds essential functions to the basic model, enabling better audio communication between departments. The video feature may be wider than the basic intercom, allowing views of the person at the door. It operates smoothly even in low lighting (thanks to its enhanced audio features) and may have a few ring tones. It is a good option where different levels of communication are required, but it can be used effectively for secure places.
Multifunctional 2-wire video intercom system
This kind of intercom has several advanced options, such as letting the user communicate with other rooms and video door stations and even broadcasting messages to other intercoms. The intercom comes equipped with many indoor units connected to several outdoor units to increase efficiency. Video features, too, have advanced to include other functions, such as screen touching, and other safety measures like movement detection features. This one is suitable for big homes and businesses that would need advanced communications and security.
Wireless supplementary intercoms
Even though the intercoms are mainly wired to work together, the option for wireless supplementing helps add diversity, especially room areas with hard-to-reach spots or extensive wiring. They still use two wires for the basic systems for convenience while offering some extra benefits. Intercom Wireless helps users cover more areas easily and without major modifications in their current systems.
Inbound logistics
Commercial intercoms are installed on the main incoming doors of warehouses and factories to help control, monitor, and identify incoming goods and materials. Getting the right equipment allows workers to communicate quickly with the right departments about what they are handling and where it should go, which improves efficiency and decreases delays. Video capabilities of the intercom also ensure that items are checked visually for safety or right conditions before being let in.
Outbound logistics
Concerning the doors through which goods leave, video intercom systems allow the clear and timely operation of shipping activities. Employees can contact them with ease to confirm orders being shipped, make transport plans, or call upon visuals of any issues with the package, thus enhancing service delivery. The video aspect improves coordination efforts between the shipping and transportation departments.
Space management
In large spaces like office areas or industrial setups, intercoms smoothen the process of communicating within different spaces and even identifying areas where one has to go. This intercom is important, particularly in areas many engineers need to move around to do maintenance work. With the clarity and ease of communication that intercoms offer, they can locate areas that may need fixing or even changes that need to be made without delay. Video features can help workers identify spaces visually, making it easier to find areas of concern.
Emergency management
Video intercoms in commercial places have to be advanced compared to residential ones since they are mainly used for security measures and emergencies. They are usually installed in strategic places, thus allowing the quick report of any security issues or emergencies that may arise. The systems are used for safety measures by giving a visual of the areas monitored, which can detect intrusion and illicit activities and enable workers to respond quickly in case of any emergency.
Increased security at entries
Video intercom systems are installed at doors and entryways to give the first line of security for employees and visitors. They help facilitate the process of identification and registration via audio and video systems that ensure only authorized personnel access specific rooms or areas. This restricted access increases security in sensitive areas where confidential work is done or where valuable equipment is stored or kept.
Display screen size/intercom camera
The display screen sizes vary, with some being as small as 4 inches and others up to 10 inches. A larger screen means better visibility of the video feed, while small screens demand less space in their installation. In terms of camera quality/intercoms, there are standard definitions, while others have high definitions, hence clearer images of those at the door.
Two wires
The beauty of this intercom system is that it only needs two wires for its operation. Wires are used to transmit video feed and audio, simplifying the installation process compared to those with many wiring systems. Often, the wiring can be run through the building's existing infrastructure, which makes it easier to do the renovations.
Communication modes
Most video door intercoms enable hands-free communication while others demand to push and speak or talk with hands in a general way. This helps, particularly in cases when the user should be multitasking or be busy elsewhere.
Power
Video intercom is powered via two wires, which carries audio and video signals. There are models powered through a central transformer, while others are powered through PoE (Power over Ethernet). These power specifications ensure the system can work optimally depending on where it has been installed.
Mount the exterior front door unit
The first step in providing intercom service is to install the exterior unit mounted at the front door of the building. Most of these door cameras have to be set at eye level so that the visitors can be seen and spoken to comfortably. They must also be mounted at a sheltered place free from water or direct sunlight but still adequately capable of capturing those around.
Mount the interior monitor
A monitor is mounted on a wall close to the entrance of the building. The placement should be at a convenient height for those who want to use the system. Consideration also needs to be made for the proximity of power sources so that intercoms can be powered.
Run the wiring
Once the exterior and interior units have been mounted, intercom wiring has to be done. Using two wires simplifies installation because the video intercoms connect easily. The wires are run from the door unit to the monitor unit, either behind the drywall through conduit or along the surface. The existing building structure can also accommodate the wiring.
Connect and power on the system
Once the wiring has been done, the next thing is connecting the two units and powering on the system. Wires should be connected to the powering source and then set on the monitor to confirm they are properly set. The system should then be tested to ensure the video feed and audio communication transmit appropriately.
Daily maintenance
Maintenance on a daily basis can ensure monitors are clean and intercoms working properly. Daily testing of door systems will help identify and rectify faults early before they develop into major problems. Cables need regular checks to see if they are worn out or have loose connections; one may replace or fix them as soon as they are noted.
Weekly maintenance
Weekly testing involves checking the video quality, audio clarity, door chime sounds, and general system performance. Software updates, if applicable, need to be installed to ensure the system operates properly. When door units are installed externally, check for any environmental damage or weather elements affecting its functioning. Do a brief assessment to ensure all system elements are operating at their optimal efficiency.
Monthly maintenance
With installations done monthly, professional maintenance is done on intercoms where thorough checks are done. It involves deep cleaning both exterior and interior parts, checking for hardware updates, making system backups if required, and general inspections for future needs. At this particular time, older cables, connectors, or even components may need replacing if they have been in use for some time. Also, consider your maintenance schedule and how you will combine it with possible repairs to keep the system durable.
There are several quality and safety considerations related to the 2-wire video door intercom system. They include:
Wire gauge and material
The intercoms work optimally on 18-gauge or thicker wires for signal strength. If thin wires are used, the quality of the video and audio transmission decreases significantly. Using copper wires instead of cheaper aluminum ones increases transmission quality because copper has better conductivity. Ensure that the insulation on the wire is rated higher than the wire's operating temperature and that it can withstand humidity if the system is installed outdoors.
Shielded cables
Consider using shielded wiring, especially if the intercom is running near electrical wiring for low-noise purposes. Shielding helps eliminate electromagnetic interference (in short, EMI), which affects the performance of video transmission in particular. Use twisted pairs with shielded wire for more effective protection against interference and increased clarity in video and audio.
Outdoor unit protection
Ensure the outdoor unit has an IP rating of at least IP54, which protects against dust and splash water. Other outdoor elements, such as extreme temperatures, humidity, and ultraviolet rays, should be accounted for when selecting a unit. Components made of weatherproof materials will stay durable and with enhanced functionality.
Testing and certification
Video intercom systems that meet the manufacturer's standards, such as CE and UL, offer a higher level of quality and safety. These tests examine parts for quality and safety, like electrical hazards and emissions, that may cause interference. These certified systems usually undergo a test for stable performance in several environments.
Regular maintenance
Video intercom door systems should be cleaned, tested, and maintained to operate optimally. This begins with doing a visual check on both indoor and outdoor units for damaged parts, such as those that need replacing. Worn-out wires, sockets, and connectors reduce the quality of transmission; they should be replaced immediately upon being noticed. Ensure the outdoor unit is also clean from any dust or debris around the lenses or microphones that cause obscured or low-quality transmission.
A1: A 2 wired video intercom communicates through two insulated copper wires. They transmit audio and video signals between the indoor and outdoor units. One wire carries the audio signal, while the other carries the video signal. It powers the system, hence eliminating the need for extra power outlets or batteries.
A2: The main purpose of a 2-way intercom is effective communication between different people over short or long distances. They help improve communication efficiency in schools, offices, hospitals, and other places where fast coordination is necessary.
A3: Many video intercoms are equipped with additional features like touchscreens, intercoms with lots of other internal units, door releases, camera quality enhancement, and add-on for external units. They may have advanced options like movement detection and cloud recording.
A4: Yes, a 2-wire video intercom can be installed outside. However, ensure the outdoor units are weatherproof and have an IP rating.
