hes@ecsvax.UUCP (Henry Schaffer) (07/30/85)
I have been involved in buying surge protection devices for both
power lines and telephone-type lines, and have been very satisfied
with the equipment I've bought from:
TII Industries, Inc.
1375 Akron St. Copiague, NY 11726
(516)789-5020
(I used a local dealer, Noramco in Raleigh, NC.)
Most of their telephone line protectors are based on three-
electrode gas tubes which ground "both sides of the pair
simultaneously when a surge arrives on either line of the pair.",
and so "protect against both longitudinal and metallic surges".
They have equipment to protect one line, as well as equipment
suitable for the multiple lines running into a Central Office
(or computer room.) E.g., a rack mounted (7" high) 100 pair
unit.
We had constant trouble with underground metallic pairs.
They were, and are, used in a control system for electrical
peak shaving, and every time there was a lightning stroke in
the county (.5 * :-)) at least one of the optical isolators
on one of these circuits bit the dust. We put in a cabinet of
these TII gas tube devices and the trouble went away.
(standard disclaimer)
--henry schaffer n c state univ