TII-210 Coaxial Broadband In-Line Surge Suppressor (TII-210FF75F225-31)

Comcast fried our modem and tv this summer. TV was on a Monster surge protector, but the line transmitted the surge and fried the power-on module. This has no degradation to signal - comcast cannot see or control it and provides the affordable protection we need.

i've used these for commercial networks and they have saved equipment that sustained a close lightning strike. Lightning fried the ISP's trap in the pedistal outside, but didn't touch our equipment in the data room. Easy to install, no reduction in dnload/upload speed. They just work as advertised.

Pros:CheapNo speed loss at 50MB/s (using Testmy.net)In theory works perfectlyCan be installed instantlyCons:Hard to attach a ground wireWill take space behind modem if installed directlyGreat item to have. Nowadays, most surges which damage computer equipment are due to the network connection (ethernet cable) and not through power cables, as these are often adequately protected. Hence this product, which is great if you want to protect all of your equipment. I installed it on the coaxial cable which entered the home, just in front of the modem, protecting everything behind.My only problem is that my modem is not grounded, and this device does not absorb energy, it diverts it, so in theory I am virtually not doing anything yet until I install a ground wire to this device, which I will do soon. This isn't necessarily dificult. It could be as easy as connecting a wire from the case of some grounded equipment (computer case, hifi case, etc...) to the supressor (just wrap it around after sanding off the paint should be sufficient).The other problem is that you'll have a rigid tube sticking out the back of your modem, which could be an inconvenience but this is up to you.Besides these only slight problems, it's a great product, and I recommend it.If it's been helpful, please click yes below if you have a sec. In any case, thanks for reading and have a nice day.

Downstream Signal strength dropped less than 0.5 dBmV and Upstream return signal remained the same +/- 0.25 dBmV and SNR remained about the same +/- 0.50 dB. That's very good. This should be installed where your cable enters the home or business (usually outside) before the splitter (if any). Be sure this is connected and close to a grounded ground block or to a cable provider multitap (which are always grounded). For example, this item would be ideal if you already have a ground block and don't want to replace it with a ground block version of this Surge Protector (TII Network Technologies 212FF75F225-21 75 Ohm Female To Female Connector Lightning Surge Protector Coaxial Cable - Amazon: http://a.co/6h36CaN ). There is also a version that has a male connection on the customer side of the surge protector (TII-210 Coaxial Broadband In-Line Surge Suppressor TII-210MF75F225-31 - Amazon: http://a.co/ecB4W5Y ).From the specification Data Sheet - To Find it just google: In-Line Coaxial Lightning Surge Protectors - Tii Technologies pdf datasheet"tii’s patented proprietary coaxial gas tube surge protector is equipped with integral failshort mechanism for a power-cross condition which shunts both the coaxial cable’s center conductor and sheath for a common path to ground. The DC breakdown voltage of the protector provides superior protection against transient surges, yet is compatible with network powered applications. The protection element is designed to reset after each over voltage event."R.F. PerformanceDC – 1.0 GHzInsertion Loss (includes Flatness): < 0.3 dB / 0.2dB TypicalReturn Loss: 30 dB TypicalProtection:DC Breakdown @ 2000 V/SecImpulse Breakdown @ 100 V/µSecInsulation Resistance150 – 300 Volts< 450 Volts>100 Megohms

Product seems well made but no way to test its function without a lightning or power surge. It did NOT work well placed in line with a "host" Uverse cable box. Distorted the color fed to the TV. Had to remove. However, on a secondary cable box it worked ok (at least did not distort color.)