SatelliteSale DIRECTV 2 PACK - DIRECTV Broadband DECA Ethernet to Coax Adapter - Third Generation (with 2 USB Power Cables)

These are great for establishing a fast ethernet (100Mbps) connection over 75 ohm coax(TV and broadcast FM cable). It wasn't a drop-in device for my requirement but it works great in the end. They wouldn't establish a connection by just connecting a 5V DC power supply to the micro USB connection. I assume they need a USB data connection also if you want to use that method of powering the devices. I think they use some power saving protocol for communicating if you power them through the USB. Which means they would need drivers for that kind of configuration. The devices I wanted to connect in the attic (USB TV tuners) and basement (ethernet network) didn't have that capability so I abandoned the micro USB connection for powering these. Since I wanted to use one of these devices up in the attic as a simple fast ethernet connection to my basement media center, I had to run 12V DC up on the same coax cable I used for the data. I used a Satellite/TV splitter with DC pass capability on the satellite path in both the basement and the attic to inject and strip off the DC from the coax. There are no RF or data signals transmitted over the satellite frequencies, so this works well as a straight DC power injector/bias tee. I didn't have an appropriate DC connector for the unusual 12V DC port on these devices so I disassembled the outer case and desoldered the 12V DC port from the PCB. The only way I could get the connectors off the board was to carefully cut the metal ground cover off the connector and then heat each solder connection while gently pulling it out of the tiny hole that it was soldered into. I soldered speaker wire to the power connections and a more standard DC port to the short piece of speaker wire to be able to inject the 12V DC to the device. The installation required a bit of soldering/desoldering capability and being handy with small cutoff tools. The end result has been installed for a few weeks and is running flawlessly connecting my two TV tuners mounted directly on my antennas in the attic, to my media server in the basement. This exercise allowed me to isolate and use two antennas one aimed at local and one aimed at distant transmitting towers covering multiple channels the are bumping up to one another in the TV band - all without any filtering or concern about cable length to eliminate destructive interference. It also allowed me to connect the tuner right at the antenna - eliminating virtually all cable loss so I could get every last dB the antenna is capable of.

Sirven bien y puedes aprovechar tu vieja instalación coaxial solo que olvide comprar los cargadores.. Es muy difícil tener una conexion USB de .5 amperes así que no olviden comprar los cargadores. No se desesperen pueden tardar un poco en establecer conexión con tu router pero realmente funcionan

As richardrx4 outlined quite well - the USB power of these units requires a connection to a PC/Mac or any other DATA activated USB port to work. I have personally tried at least 11 different USB power adapters in vain + also tried a couple of Active USB hubs (the ones with external power supply). So far, the only success has been with a PC USB port on one side and my Android media player USB port on the other side. It is worth mentioning also that the ping between the two ends of a 10 meter BNC cable resembles a lot the result of a Powerline ping! I have done the Internet speed test from the same PC over BNC and over Powerline and the results are attached. So, bottom line is - even if one manages to find an independent USB power adapter that would power those devices - the end result might well compare to the result of the less hassle Powerline solution. UPDATE: As richardrx4 pointed out, the option with the 12V power supplies would not work either, as those power supplies are intended for the US 110V power network and would most certainly blow up if connected to the European 240V power grid. On other hand, I have seen in some forums that people have taken the liberty to buy the option with power adapters, just for the sake of cutting the wire with the barrel connector, which later would solder to a proper 240V-12V power supply, thus bypassing the 110V limitation. This might be an idea.

Used the product to connect CCTV to a local server. Works perfectly!

These devices work perfectly over your existing 75ohlm coax terminated with RG6 connectors. They operate at 100Mbps which is still good for most household LAN operations. Each device MUST be plugged into either a PC USB port or a router USB port or a combination of the two. They will not operate with a USB power brick. Plug and play, just give them a minute to discover earchother the first time and they will operate dutifully for you.