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- Newsgroups: comp.dcom.lans.ethernet
- Path: sparky!uunet!sci34hub!gary
- From: gary@sci34hub.sci.com (Gary Heston)
- Subject: Re: Mixing RG58/U and RG-59 cable
- Message-ID: <1992Jul23.211739.23240@sci34hub.sci.com>
- Reply-To: gary@sci34hub.sci.com (Gary Heston)
- Organization: SCI Systems, Inc., Huntsville, Al.
- References: <2017@tivoli.UUCP> <1992Jul20.183415.19005@sci34hub.sci.com> <10992@rls.UUCP>
- Date: Thu, 23 Jul 1992 21:17:39 GMT
- Lines: 31
-
- In article <10992@rls.UUCP> randy@rls.UUCP (randy) writes:
-
- >How do you go about determining the length of thin line cable that
- >wasn't installed too terribly well? I have some cable run in a rambling
- >and looping fashion throughout the laboratories. A great deal of the
- >cable is behind walls or above ceilings and we need to know what it will
- >take to expand. Anyone?
-
- Buy or borrow a cable tester with a TDR built in (many protocol analyzers
- have these as well); pull the terminator off one end, go to the other end
- plug in tester, and read the distance to the open.
-
- I use a MicroTest Quick Scanner for this; it works quite well. They can
- also be used to test the amount of cable remaining on a spool (up to
- 2000' with the Quick Scanner).
-
- If all you have is an ohmmeter, you might be able to short one end, pull
- the terminator off the other, measure the resistance, and compare that
- with a known length (like a new spool of cable) to get a rough estimate.
- You'll only see a few ohms over a several hundred foot length, though,
- and would need a fairly good resolution meter (and consistent cable type)
- to get a usable number.
-
- Gary
-
-
- --
- Gary Heston SCI Systems, Inc. gary@sci34hub.sci.com site admin
- The Chariman of the Board and the CFO speak for SCI. I'm neither.
- "Always remember, that someone, somewhere, is making a product that will
- make your product obselete." Georges Doriot, founder of American R & D.
-