Tons of surge suppressors and line filters for 120vac power. But I can't find anything (good) for protecting my cable internet RG-6 coax line. I assume CATV filters are one directional. Internet coax signals go both ways.
Because it is called a surge protect
or proves it does surge protection? Most only believe what they are ordered to believe. That is enough to know? Nonsense. That is how scams are promoted.
No protector does protection. None. But those who know blindly what they are told know otherwise.
The NIST (US government research agency) says what every protector does (and why that Belkin does not even claim protection in its numeric specs):
> You cannot really suppress a surge altogether, nor "arrest" it. What
> these protective devices do is neither suppress nor arrest a surge, but
> simply divert it to ground, where it can do no harm.
Will your protector stop what three miles of sky could not? That is what a Belkin will magically do. But as the NIST says, protection is an earth ground. Where do hundreds of thousands of joules dissipate? Inside that protector? Nonsense. Read its specs. Not possible.
Either a protector connects massive energy harmlessly to earth. Or it does absolutely nothing (like the Belkin). No protector does protection. A protector connects surges to earth. And yes, this must be repeated so many times because advertising makes it difficult to understand. A protector is only effective when it connects that surge current harmlessly to earth.
Your cable needs no protector. No protector is necessary to make a connection to earth. Cable is connected by a wire. What a protector might do is done better by a 12 AWG wire. But only if that wire is short, has no sharp bends, is not inside metallic conduit and other critically important electrical facts. Facts completely unknown to many who would recommend that Belkin.
The entire and best protector - that wire from RG-6 to earth - must be installed by the cable tech. Is required by the National Electrical Code. And must connect to the same earth ground also used by the AC electric 'whole house' protector. Any rule violation means an entire protection system is compromised.
But this is a most important fact from all posts combined. Single point earth ground is your protection. A protector either connects short (ie 'less than 10 feet') to earth (as defined by the NIST). Or you have no protection. That Belkin has no wire for an always required connection to earth. And does not even claim to provide that protection.
Don’t worry about a protector. Worry about the only thing that always does protection. Single point earth ground. A protector is only as effective as its earth ground.
That also applies to all AC mains protectors. Either you have earthed one 'whole house' protector. Then protected everything even from a direct lightning strike. Or that AC mains protector does not even claim protection in its specs. But again, from over 100 years of well proven science. A protector is only as effective as its earth ground.