Date: Tue, 6 Nov 2001 10:09:36 -0800 (PST) From: Bill Schoolcraft <bill@wiliweld.com> To: Bill Moran <wmoran@potentialtech.com> Cc: <questions@FreeBSD.ORG> Subject: Re: Welders causing dial-out to fail Message-ID: <Pine.GSO.4.33.0111060920220.28168-100000@corten8.billschoolcraft.com> In-Reply-To: <3BE81735.7020302@potentialtech.com>
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At Tue, 6 Nov 2001 it looks like Bill Moran composed: wmoran->This may be a little off-topic ... wmoran->I have a client who I installed a FreeBSD proxy server for. wmoran->It uses pppd to dial out on demand. Right from the start, the wmoran->client has been having problems with the reliability of the wmoran->dial-out. To make a long story short, after a lot of testing wmoran->and speculating, we determined that its electric welders in the wmoran->shop causing the problem. There are five resistance welders in wmoran->the shop and when all five are working, the Internet connection wmoran->is simply unusable. If two or three are in use, the Internet wmoran->is slow, the connection drops a lot and has to dial 2 or 3 times wmoran->to get a connection. If nobody is welding, the Interenet wmoran->connection works perfectly. wmoran->The interference exists on all 4 phone lines, it's audable at wmoran->times on the voice lines (but never very bad) and has never wmoran->been bad enough to disrupt the fax machine. wmoran->We had the phone company (Verizon) come in and they basically wmoran->said, "Our wiring isn't the problem, you may want to have this wmoran->building rewired." wmoran->Does anyone have any experience with this kind of thing? Rewiring wmoran->the building is pretty much cost-prohibitive. Verizon did install wmoran->a noise filter at their junction box, but the improvement is very wmoran->minimal. wmoran->We're searching a few avenues for a solution, one being the wmoran->manufacturers of the welding machines, but I thought I'd put the wmoran->question out to this list and see if anyone else has worked through wmoran->and found a solution for a problem like this. wmoran-> In my old shop http://wiliweld.com/calbody we had the wires not only covered for sparks but for "noise" since we had CAD programs running on computer driven burning/punching machines. If this is only a few phone lines I'd imagine running them through some "noise" proof conduit, possibly PVC of some sort till you get out of the area, or possibly see if the interference is coming from the actual welding contacts or the machine(s) internal panels, then you may enhance the shield by wrapping the source of noise. AM radios were useless in the shop, but FM was fine. etc. etc. Hope something helps here. -- Bill Schoolcraft | PO Box 210076 San Francisco, CA 94121 http://ForwardSlashUnix.com "UNIX, A Way of Life." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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