2-wire video intercom systems remain in demand as long as there are so many houses left with old wiring in the walls, which is indeed quite problematic to replace. Therefore, our friends from BAS-IP UK came up with a solution to address the issue. A so-called “RetroFit” video intercom system, allowing us to get the benefits of an IP network-type system but with old wiring, and with no replacements done. Today, you are going to learn what it is, how it works, and how to make it work for you.
What you see above is a common application scenario. The indoor monitor and the outdoor video door phone. The trick is that we have 2 converters on both ends of 2 lines – SWO1 and SWO2
The door phone is powered with a 12V PSU, as the master converter, but with a 48V power supply. So basically, what happens here is that the video and audio data come from the door phone to master converter 1 via standard UTP cable → that data is converted in that way to make it able to be transmitted over 2 lines and plus power, and then it is converted back to its original state. And from the SWO2 converter, the video and audio data go to the monitor along with power, since the slave converter provides PoE, unlike the master SWO1. We can also swap the positions of the monitor and the door phone with no other changes applied. So, this way you will get a Door Phone powered via PoE, and a power supply for the monitor as well.
The Operating Range Matters
Maximum distance between the converter and the door phone or a monitor reaches from up tp 60 to 100 meters
The limit of distance between 2 switches is up to 30 meters.
Demonstration
From the moment when the system is online, here is where we get to awesome features due to that the system is based on the Android OS. The manufacturer emphasizes that you can use the AT-07L monitor as a middle link between you and other 3rd-party video surveillance, security, and smart home-related devices, some kind of a Hub where you have it all
Devices Overview: Door Phone
A few words about the door phone and the monitor: The AV-04FD calling panel unit is designed to be flush mounted, while the AV-04SD is intended for surface mounting. The aluminum face plate, body were built to match an IP65 protection rate and to be vandal-resistant. 720p HD camera module with LEDs around it to light up a scene at night. 125 degrees FOV, speaker, single call button with backlight, and the microphone below it. On the rear part, we’ve got 12V power in and RJ-45 for Ethernet, that you can use for PoE if you have a switch, and you also have the terminals to connect within different peripherals like electromagnetic, electromechanical locks, exit buttons, and et on.
Intercom Monitor
The monitor is pretty nice, comes in 3 different colors: silver, gold, and black to fit well with your furnishing color. The good thing is that within the box, you get 2 brackets for surface and flush mounting, and by the way, there are magnets in here on the rear to make it as convenient as it can be. AT-07L is an intercom monitor, made from aluminum and glass on the front, and Plastic rear. 7-inch 1024×600 LCD touch screen, and what’s behind the screen is an Android 6.0-based system, powered by a 12V power supply or due to the PoE feature. We can get up to 9 door phones at once, 8 additional monitors, 8 alarm sensors, and up to 32 IP cameras, where 4 of them can be viewed at once on a single screen. The maximum microSD capacity supported is 32 GB, on which we can store photos, videos, and audio files.
