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- Newsgroups: comp.dcom.lans.ethernet
- Path: sparky!uunet!cs.utexas.edu!qt.cs.utexas.edu!yale.edu!yale!actcnews!sun1x!utrc.utc.com!wjm
- From: wjm@utrc.utc.com (Bill)
- Subject: Re: Info on ribbon cable for AUI connections
- Message-ID: <8JAN199310323324@utrc.utc.com>
- News-Software: VAX/VMS VNEWS 1.41
- Sender: news@sun1x.actc.res.utc.com
- Nntp-Posting-Host: utrcv1
- Organization: United Technologies Research Center
- Date: Fri, 8 Jan 1993 15:32:00 GMT
- Lines: 48
-
- -----------------------------------------------------------------------------
- Paul Hyder writes:
-
- A significant number of in-house made ethernet transceiver (AUI) cables
- made with DB15 connectors on (unshielded) twisted pair ribbon cable
- are (fairly rapidly) appearing on the local network here. As is true
- of many such shortcuts they seem to be working (when pairs are matched
- properly).
-
- My experience and a general attitude of "follow the spec to the letter"
- cause these cables to scare me. So, the question is:
-
- Does anyone out there have any hard data (pro or con) on AUI cables
- created by clamping a pair of connectors on a twisted pair ribbon
- cable?
-
- Email responses appreciated. I'll post a synopsis.
- Paul Hyder
- -------------------------------------------------------------------------------
-
- At our location we have also used lengths of ribbon cable with DB15
- connectors on them. They are usually used to connect a thick to thin wire
- converter (DESTA or equiv.) to a system or workstation, or to daisy chain
- DELNIs or make short connections between other similar devices.
-
- None of the cables are more than around three feet.
-
- At first, I too was leary about this. (We used straight ribbon cable - no
- twist - and crimp-on connectors.) Overall, I would say that there are
- around 100 such cables in use in various locations/applications here, and
- we have not seen any problems yet. I would guess that if the cables were
- any longer, we would have trouble.
-
- On a different note, one thing that I would warn against, is NOT to extend
- the center conduct of a thin wire "T" when dasiy-chaining a thinwire ethernet
- run between systems. That HAS caused immeadiate problems. The T connector
- MUST be right on the workstation or DESTA type device.
-
- Hope this helps,
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- + Bill Mazeika WJM@UTRC.UTC.COM +
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