Path: utzoo!attcan!uunet!cs.utexas.edu!sun-barr!newstop!texsun!texbell!vector!telecom-gateway From: zygot!john@apple.com (John Higdon) Newsgroups: comp.dcom.telecom Subject: Re: Tanks near Telephone Poles Message-ID:Date: 8 Aug 89 16:17:49 GMT Sender: news@vector.Dallas.TX.US Organization: ATI Wares Team Lines: 14 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us X-TELECOM-Digest: volume 9, issue 285, message 11 of 11 In article , claris!apple!netcom! wasilko (Jeff Wasilko) writes: > I've seen compressed gas cylynders near poles and I've always wondered what > purpose they are used for? Could anyone shed some light on this? These tanks are filled with nitrogen. By using positive pressure withing the cable housing, moisture is kept out and sudden loss of pressure could indicate cable damage or failure. BOCs generally pressurize from central points; GTE and other independents use those tanks that you have noticed. -- John Higdon | P. O. Box 7648 | +1 408 723 1395 john@zygot.uucp | San Jose, CA 95150 | M o o !