Path: utzoo!attcan!uunet!husc6!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!decwrl!decvax!ima!mirror!frog!barr
From: barr@frog.UUCP (Chris Barr)
Newsgroups: comp.dcom.lans
Subject: Shielded vs. Unshielded
Keywords: ethernet, twisted pair, shielded
Message-ID: <1559@frog.UUCP>
Date: 28 Jun 89 23:41:00 GMT
References: <4015@quest.UUCP>
Distribution: na
Organization: Charles River Data Systems, Framingham MA
Lines: 14

In article <4015@quest.UUCP> stone@quest.UUCP (Scott Stone) writes:
>
>  I would like some informed opinions on shielded vs. unshielded cable.

1. Ethernet over Shielded twisted pair cable is rated for *shorter* length
   that UTP - I believe by about 10%.  (Yes, STP max. is *shorter* than UTP.)
   This is for Lattisnet, whose UTP max length is > 300 ft.

2. UTP is subject to interference.  When we had troubles, the vendor would
   always inquire about flourescent lights' proximity.  Our problems were
   due to loose connections - yet clearly noise can disrupt UTP.  

   I also wonder whether UTP Ethernet has emitted noise that affected
   other signals, e.g. telephone, async, ..