The adapters start out working but drop out. I think when the Ethernet goes to low power mode.

After my initial poor review, i set these up on a 150ft line expecting to get slow speeds under 10mbs since that was the results I got over 6ft of cable. Now that it has been in place for several months, I wanted to test the actual speed before I tried other solutions. It seems I am getting 100mbs both ways fairly reliably.On the down side, if the coax is not plugged in but the ethernet is, it can take down your network. It seems to cause some sort of feedback and my network gets flooded with packets to the point where it's saturated. It's not a normal use case but keep that in mind.

These guys can be made to work. I bought three pairs of them because the genius that wired my house had daisy chained my phone lines with CAT 5 and home runned my CATV. Furthermore, none of the phone jacks were where they would be useful and the CATV outlets were exactly where I wanted my network connections.You can imagine my disappointment when not one of the three runs actually worked. No amount of connection checking, wire securing or even praying worked. I had counted on one run or maybe even two not working but all three? So I get to work to prove that either they are totally worthless or discover the knack to get them working.I setup a test rig, for a best condition scenario, with just two feet of coax connecting a pair of these devices. At this point my theory was that they are so low quality that not a single pair had two working devices and I was determined to find two that would work and get at least one line working. What I found with my tests was that they are not so much low quality as finicky – sensitive to be polite. Slightest loose connection, not perfectly aligned cable, etc… would throw them off their game. What increased the chance of failure were the BNC adapters needed to connect the BNC coax end to the CATV coax. Right amount of gap, tight enough but not too tight… Furthermore I discovered that just one misconnected device could play havoc with the entire network. The router would not route correctly or new devices were not issued IP addresses – all sorts of craziness.Eventually I got all three lines working and came up with a how to recipe in the process. First I disconnected every NE-SE01-020Q from my network. Got myself an Ethernet switch (a smart hub although a dumb one would work too), and a coax terminator from my local hardware store. Plugged in the Ethernet switch’s power cord and then for each run I followed the following procedure:1) Plug an Ethernet jump cable into the switch. Port light on the switch should remain off.2) Plug the other end of the jump cable into the Ethernet port of NE-SE01-020Q. Port light on the switch should come on.3) Attach a BNC adapter to the coax end of NE-SE01-020Q, and test the connection by plugging the coax terminator into the other end of the adapter. Port light on the switch should go out. If the port light is not out, check the adaptor or check the NE-SE01-020Q. No point to continue if the port light does not go out.4) Remove the coax terminator and plug in one end of your coax cable instead. If the other end of the cable is not terminated, the light should remain on. To check the coax cable, plug in the terminator in to the free end and the light should go out.5) Now that one end is working, follow the same procedure, starting from the other end of the run.In the end I realized that most of my problems were caused by just one faulty BNC adapter. Amazon calls them “BNC Male to F Female Plug Coax RF Connector”. Also one run of my coax had a grounding wire attached to it but was not grounded. By making sure my Ethernet switch is grounded I got that run to work also.I hope either the manufacturer or the importer picks up on this and writes a proper how-to and or instructions for these devices. With the proper instructions they can be quite useful.

This is a terrific product. It does exactly what it claims to do.There are no cons with this product; it's all pros. They come neatly boxed with clear instructions. You open the box, plug them in, and you have Ethernet over coax, just that simple. I used these to convert an older CCTV camera installation to an IP camera. This turned out to be truly plug-and-play. I had 12VDC power at the location and a coax cable under 50 ft. in length. The camera I hooked up is a 4MP unit. Per instructions, I plugged it into a 10/100 switch running off my gigabit smart switch - worked like a charm. The line is sufficient to handle the full resolution of the camera. Worth every star!

Bought 4 of them and they worked great. Q few things to consider.Make sure you use a 10/100 switch or router. Will not work on a gig connectionReset camera if you dont see picture right away.

These converters didn't work at all in my environment. My RG-59 COAX is about 12-meters long and tests okay, but I was never able to pass a TCP connection. Further, a converter when plugged into one port of an eight-port Netgear switch would completely kill the other ports after about 30-minutes. Removing the converter and cycling the power on the switch would cause normal operation to resume.

Very impressed with the simplicity of these passive converters. I ordered 3 sets to test and installed 2 pairs on a job site to replace active extenders that have been failing. I extend a single IP camera (2Mbps) on 200' of RG-6 coax and 4 IP cameras (8Mbps) on 200' of RG-6 coax and these converters immediately synced and moved data without issue. I installed the third pair on a 450' run of RG-6 coax to replace another active converter to pass data (6Mbps) from 3 IP cameras and like the prior site these worked flawlessly. I did some experimentation and can verify that these will NOT work on 1000base T auto negotiating switches even when the RJ-45 cable is pinned out with only 4 wires to force 10/100 operation, these converters must get some minimal operating power from the 10/100 ports themselves as there is a board with minimal IC and SMC components inside the converter. The instructions also state that the RG-45 cable run from converter to switch and or device should be under 6.5'. I also noticed an issue when plugging in the converter to one of my work switches without being terminated to coax my switch would behave strangely and drop data until I terminated the connection, not sure what the cause is there. I plan to do some testing on some maximum distance runs to see the actual real world performance using RG-6 coax.Pros: Simple integration, no power requirement, fast sync, good data rate (100Mb @ 325') (10Mb @ 650')Cons: Will not work with 1000 base T Gigabit switches or some 1000 base T Gigabit devices, requires converter to be installed within less than 6.5' of category 5e/6 cable between converter and hub / end device.