The Most Simple Way to Live Doorbells

Doorbells Development: 

From the initial music electronic doorbell, to intercom access control, password access control, and then video surveillance access control, with the rapid development of such as the Internet and AI new technologies in recent years, the application of access control is also rapidly updating: With the continuous improvement, QR code access control, face recognition, fingerprint and other bio metrics continue to emerge, smart access control systems application is also more extensive.

There are also many public areas such as factories and parking lots, important telecom base stations, and intelligent motor control. Intelligent access control system is applying to different fields.

Network Pains:

Intelligent access control system is inseparable from network support, at least between indoor unit and outdoor unit request network connection. Well, traditional network connection mainly relies on network cable transmission, such as CAT5E / CAT6 network cable, wireless WI-FI transmission, Bluetooth transmission, etc.

Extensive market demand rises to a large number of users’ needs for the renewal and transformation of access control systems. However, the replacement of access control systems faces a big problem, that is, except newly developed buildings, the old buildings or other application scenarios, access control almost haven’t the conditions for network wiring.

That means if you use wireless or Bluetooth access control to transmit signals, in case the distance between the outdoor and the indoor unit is a little far away, or there is a partition wall, the signal will be greatly attenuated. If use the wiring network cable, will cause increased cost of the network cable, as well as the construction cost.

Power line Communication (PLC) PROS:

At this time, Powerline communication (PLC) technology is a high-quality option for upgrading and replacing access control. The low-cost 200Mbps PHY Rate PLC solution can fully meet the network support in common scenarios.

When under normal power line environment, the Home plug AV transmission distance is 300 meters, the coverage area is 5000 square feet, PLC Peak Throughput of UDP is 90Mbps, TCP is 70Mbps, of PLC nodes Total nodes is 8 pcs, Simultaneous active is 4 pcs, with 4 simultaneous active One node can fully satisfy the transmission of three high-definition 4K images.

typical topology diagram of access control application

The biggest feature of using Powerline communication (PLC) products is that there is no need to rewire the original access control system. The rewiring will damage the wall, if it is with open wires, it will be very unsightly and require drilling and threading across the wall. Using PLC products, there is no such problem.

You can easily use the power lines in the original early doorbell or intercom system for network signal transmission. Compared with wireless WI-FI and Bluetooth, PLC transmission can easily transmit through walls, and the signal Relatively more stable.

Suitable Powerline (Homeplug AV )modules: 7TM120/7LP120

7TM120 is a 200 Mbps PHY Rate powerline communication (Homeplug AV) module, featuring high integration, small size, stable operation and reliable performance. The standard size is 38×36.4x15mm (LxWxH), one end can be embedded into the indoor unit of access control, the other end can be embedded into the outdoor unit, and can even be directly embedded into the outdoor camera. The working voltage is DC12V, which is very convenient to take power.

7TM120 dc12v in powerline module

7LP120 is a powerline communication module device more suitable for retrofitting old access control. It has an ultra-thin design with a thickness of up to 8mm. (In the case of the limited volume of the original access control), the ultra-thin and pin design has a thickness of up to 8mm. 8mm, suitable for PCB embedding in the small space of the original access control .

dc powerline module embed in intercom board

In addition, 7LP120 supports PLC filtering, overcurrent and lightning protection, and customers can choose freely. 7LP120 also supports fault self-recovery function, which improves the reliability of product operation.

7LP120 powerline module ultra thin


Of course, the use of Powerline communication (PLC) products in the access control system also have some restrictions and requirements, mainly related to its technical characteristics. Because PLC uses high-frequency signals to transmit data, part of the frequency of switching power supply and PLC signal transmission frequency part overlap, so switching power supply,  voltage regulator and other electrical appliances may affect the transmission of signals. In addition, electrical appliances in the grid / Too many devices/long distance between modules/   old quality wires, the non-standard overlapping of power lines, etc., will affect the signal transmission.

Therefore, before purchasing and installing, you can communicate with the supplier about the use requirements. According to different specific needs, manufacturers choose models reasonably to meet the needs of users to the greatest extent.

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