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Question:

Why does modem/DSL need protection from surges?

i dont understand this, every surge protector claims to protect phone lines from surges but why?

Answer:

Two weeks ago we had a heavy duty thunder storm. it went through the Phone Line this is what got fried, Telephone, DSL modem. Router, Ethernet card in desktop computer, PS3 So I guess it went through phone then modem then Ethernet card, to router that was wired to the PS3. This is why you want to protect your phone lines if you have DSL. I learned a very expensive lesson. I now have my phone/DSL line surge protected.
If a heavy piece of electrical equipment in the vicinity (even a block away) suffers a serious failure causing a massive power surge, it can cause an inductive surge down ANY nearby cables. Considering ALL cables are often run underground, and have to be parallel to reach the same places, this can mean extremely high voltage spikes on the telephone cables, or cable tv lines. Also if overhead cables are used, a lightning strike a long distance off can present dangerous spikes on the line into the building. In a few buildings I have worked at, I have actually received a shock from an unterminated pair of network cables which where connected at the furthest end for testing. In one case it measured 110v with 240v power cables in use. I actually ran a small 110v light from it and then had 90v across the lamp. Really surprised me.
The surge protection works via combating the skill surges which could take place whilst a line is hit via lightning, or whilst skill unexpectedly is going off. In a worse case project you're able to desire to burn out ALL electric powered home equipment that are linked, and in spite of small surges your computer could desire to be broken. relatively a solid concept to have the computer secure, regardless of in case you haven't any longer something secure.
Because DLS and phone lines operate on voltages and currents and are susceptible to lags/spikes. GL

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