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An Analog Door Phone by itself can only provide a bi-directional communication once installed. In order to provide door access an extra remote controller unit need to be installed as well as a matching door latch. Additionally to connect to your office IP network, an analog Door Phone requires an ATA device.

An IP Door Phone setup is much simpler and only requires a door latch.


Doorphone - Can be either IP or Analog. An IP phone will connect directly to your office network and will receive power from it using POE technology (power over Ethernet). An analog phone will need to be connected to a power source, which can be a regular phone line.

Door latch - The door latch allows for a remote opening of a door. There are mechanical types and magnetic types.

How to choose video intercom?

Choosing the video intercom the buyers often do not know a lot about this product. This is not surprising because the video intercom appearedrecently in our lives in comparison with other household utilities (such as TV, telephone, notebook etc). That is why to find more information about a video intercom buyers begin to surf the Internet to find the answer: how to choose video intercom? This article can help you to solve the problem. With our help you will find the real answer.

Color or black-white picture?

First of all you have to answer the question yourself do you need the video intercom with black-white picture or more up-to-date color video intercom? Both these variants should be discussed. The black-white variant fits perfectly for the office. But for the private house it is better to choose one of the color video intercoms to make the atmosphere at home secure and comfortable. The video intercom as any other thing in your house is the interior design item. That is why it should fit in the interior.

As far as we began to talk about the interior we should notice that the manufacturers present their equipment in three color schemes, namely: white, black and grey metallic. Everything depends only from your wishes.

Anyway having chosen do you want a black-white video intercom or the color one we can move along. Farther we will discuss the color video intercom because we should keep up with the times.

Do you need a handset?

As far as the model range is very various it’s time to speak whether you need a device with or without handset. At first let’s discuss the one with a handset. What is the main advantage? It is noteworthy that with a help of handset you can talk with a visitor and others around you won’t hear your conversation what is really necessary sometimes. The video intercom without handset also has own advantages. Firstly, it is very convenient. Secondly, it is up-to-date. The manufacturers expanded the model range without handsets and designed models with touchscreen.

As a result we can say that you have lots of choice. And it would be easily to make up your mind what you like. Someone likes to use the handset whether others want to use up-to-date function ?Hands free?.

Is the CRT size important?

So you choose whether you want the black-white or color video intercom and also make up your mind do you want it with or without handset, than it’s time for you to pay your attention what CRT size you want. The manufacturer Commax Co, Ltd. offers you CRT size 3.5, 5, 7 and 10.2 inches. That is why first of all you should measure the place where you want to install your video intercom. It’s important because sometimes people buy devices and during installation they clear up that there is not enough place for installation. Also you should remember that the devices you’re going to use should be handy for you.

What the diagonal influences on? It influences on the pictures that is why the bigger the image is the more details you can see. If truth to be told, it doesn’t affect anything, but you shouldn’t spare on the outdoor panel. If you choose the video intercom with the diagonal more than 5 inches, you should take the according panel. Selectingthe outdoor panel you should pay your attention on what viewing angle does it have. For example, for the 5-inches video intercoms fit perfectly outdoor panels with viewing angles V 75°, H 55°.This is enough big viewing angle and you will receive quality image. To compare if we choose, for example, the outdoor panel with theviewing angles V 55°, H 40° for the 5-inches intercom you should be ready that the image will be stretched.

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