home *** CD-ROM | disk | FTP | other *** search
- Path: abe-ppp360.fast.net!user
- From: shenning@fast.net (Stephen M. Henning)
- Newsgroups: misc.consumers.house,comp.dcom.modems,comp.sys.ibm.pc.hardware.comm
- Subject: Re: Lightning vs. My Modem (Round 5)
- Date: Fri, 22 Mar 1996 13:46:11 -0500
- Organization: Boy Scouts of America
- Distribution: world
- Message-ID: <shenning-2203961346110001@abe-ppp360.fast.net>
- References: <GE03429.96Mar20073652@loads1.mar.lmco.com> <76711.2013-2103960918120001@cnnmac9760.turner.com> <fontaine-2203960842550001@macaf.sri.ucl.ac.be>
- NNTP-Posting-Host: abe-ppp360.fast.net
- X-Newsreader: Yet Another NewsWatcher 2.1.8
-
- In article (Dans l'article)
- > <76711.2013-2103960918120001@cnnmac9760.turner.com>,
- >
- > > Nothing is faster than lightning... not even a surge suppressor. If you
- > > read the manual, you will see that repeated.
- > >
- > > The only way to guarantee protection is to unplug it.
-
- Actually lightning is rather slow. It has about a 10 microsecond rise
- time and a 1 millisecond fall time. The problem is that telephone
- protectors are rather slow. The carbon block and the gas tube do permit a
- spike to get through. The silicon diodes or MOVs that are used for
- secondary protection are plenty fast enough to clip these spikes, but die
- a little each time they take a strike. I lost a couple modems (in the
- 70s) before I installed protection and have never lost one since. I have
- lost several protectors to lightning, but they died saving my modems. May
- they rest in peace. Actually the whole thing is a little stupid. When my
- Hayes modems got zapped, I just sent them back to Hayes and they fixed
- them for free. Now when my secondary protectors (the ones with diodes and
- MOVs) get zapped, I have to buy new ones. There seems to be a
- contradiction here.
-
- Don't forget that lightning comes in on phone lines and power lines. You
- need protection on both.
-
- --
- Cheers, Steve Henning in Reading, PA USA
-
- http://www.users.fast.net/~shenning
-