elmquist@nachos.SSESCO.com (Chris Elmquist) (12/06/90)
I'm looking for a piece of test gear that can be used to simulate long lengths of twisted-pair wiring... loss and distortion are the important things to simulate.. noise and cross-talk are not. Ideally, this device would simulate variable lengths of line with some kind of tap arrangement perhaps. We are trying to get away from buying miles of TWP and stringing it around the lab. Any clues would be appreciated. Thanks. Chris -- Chris Elmquist, N0JCF Internet: elmquist@SSESCO.com AMPRN: N0JCF@WB0GDB.MN.USA.NA BellNet: (612) 785-3516
larry@kitty.UUCP (Larry Lippman) (12/07/90)
In article <273@nachos.SSESCO.com>, elmquist@nachos.SSESCO.com (Chris Elmquist) writes: > I'm looking for a piece of test gear that can be used to simulate > long lengths of twisted-pair wiring... loss and distortion are > the important things to simulate.. noise and cross-talk are not. > > Ideally, this device would simulate variable lengths of line with > some kind of tap arrangement perhaps. We are trying to get away > from buying miles of TWP and stringing it around the lab. I have two Allen-Tel GB-8970 artificial line test boxes that will do exactly what you want. Each box will simulate over 100 kft of cable in different gauges. I purchased these from Graybar Electric in 1971 for an absurd amount of money. I don't know if Allen-Tel still manufactures such a product, however. I would suggest that you contact a local Graybar distributor. I believe that Wilcom and Porta-Systems also manufacture artificial line boxes. There are also active simulators which create phase jitter and various types of distortion, but they do not simulate the distributed network characteristics of long loops. Larry Lippman @ Recognition Research Corp. "Have you hugged your cat today?" VOICE: 716/688-1231 {boulder, rutgers, watmath}!ub!kitty!larry FAX: 716/741-9635 {utzoo, uunet}!/ \aerion!larry
lstowell@pyrnova.pyramid.com (Lon Stowell) (12/08/90)
Depends on the frequencies of the twisted pair you want... If you are looking to duplicate the public telco dial or leased line, there are a couple boxes...they can even emulate the CO switching... The most commonly used one is the TAS 1010...it can duplicate virtually ANY impairment that a telco circuit can... For LAN frequencies, good luck.