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Posted by on June 7, 2008, 10:08 pm
As others have stated, the telco protector has to be grounded to work.
It sounds like you have a grounding issue.
The way these things work, is that when the voltage reaches a certain
level then the device shorts to ground. Earlier devices use carbon
blocks with an air gap between them. This limited the voltage exposure
to 1000 volts which was adequate for rotary phones but not necessary
for modern electronics. The next generation used gas tubes which
provide better protection (around 365V, if I remember correctly). The
following generation used solid state devices which provided even
better protection.
The question is what do you have. Depends on the age of your
installation. If you still have carbon blocks, I would see if the
telco would upgrade your protector. If you have a network interface
then you probably have gas tubes or solid state which is the best the
telco will supply.
As for the suggestion of making your own protector. I believe that the
ring voltage is 220 volts. I would not use 160V MOV as someone
suggested. There are companies that make telco protectors. Most use
cheap MOVs. If you can find one with solid state device which react
quicker, it would offer better protection but at a higher cost.
Part of the problem is tthat device manufacturers often do not realize
the voltages that can occur on telephone lines. The cheaper equipment
manufacturers often use components that cannot withstand these
voltages. It is easy to blame the teleco but the reality is that the
current generation protector offer the best protection while allowing
the network to work. I admit I am bias since I used to work for the
group that designed these protectors.
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