>side of the modem electronics to the other and cause problems. unless you >use a surge suppresor with a fuse on the phone line, many surges will >hopelessly overload the the surge suppression and make those parts fail. >no surge arrestor completely blocks the transient signals, so there's >always some surge that gets through, particularly if the surge arrestor >isn't grounded or well grounded in which case many surges will be >dissipated in the modem rather than the surge suppressor (if there's a >large inductance in the ground line because of how the house is wired, or >the whole house ground is poor then it isn't much help). also, after >repeated surges surge arrestors often fail, usually shorted so the phone >won't work and it's easy to find, but it is possible for them to fail open >and essentially just stop working without interfering with normal phone >function so there's no warning. > I sometimes get terrible lightning here in TN and lost a few phones & answering machines, so I designed a multi-stage filter-supressor for my phone line. It consists of multiple delta ZNR supressors in series with inductors & small resistors. Since then I have never lost anything connected to the phone lines except pieces of the filter, which occasionally blow up during strikes. Usually just the first stage explodes. I can describe it in more detail if there is any interest.
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