home *** CD-ROM | disk | FTP | other *** search
- Path: news.deltanet.com!jlundgre
- From: jlundgre@delta1.deltanet.com (John Lundgren)
- Newsgroups: misc.consumers.house,sci.electronics.misc,comp.dcom.modems
- Subject: Re: 60Hz buzz on phone line & modem problems
- Followup-To: misc.consumers.house,sci.electronics.misc,comp.dcom.modems
- Date: 8 Jan 1996 16:18:58 GMT
- Organization: Delta Internet Services, Anaheim, CA
- Message-ID: <4crg5i$gca@news2.deltanet.com>
- References: <4cf1le$49d@guysmiley.blarg.net> <DKow0B.4GM@nsc.nsc.com> <siegman-0401962114430001@tip-mp6-ncs-16.stanford.edu> <1996Jan6.035540.13484@3do.com>
- NNTP-Posting-Host: delta1.deltanet.com
- X-Newsreader: TIN [version 1.2 PL2]
-
- Dave Platt (dplatt@ntg.com) penned:
- : > Besides disconnecting phone lines or phone units one by one to
- : >see what happens, you could try opening your _circuit breakers_ one
- : >by one, to see if any particular electrical circuit is the culprit.
-
- : Also, check around the house (especially in the garage, or wherever the
- : demarc is) to see if there's a small power brick plugged into an AC
- : outlet, and into the phone wiring. This might be the culprit.
-
- : Some older phones (the "Princess", in particular) had dial or touchpad
- : lights, which received power from the yellow and black wires in the
- : four-wire cable. Power (low-voltage AC, if I recall correctly) is fed
- : to the yellow/black pair via a transformer. This method of lighting up
- : dialpads is obsolete these days, but I've seen a few older houses which
- : still have the transformers plugged in and providing "juice", even
- : though they haven't had a Princess phone plugged in for decades.
-
- : The presence of such a power-brick could cause a buzzing on your phone
- : line. It's not unusual for the phone junction boxes throughout the
- : house to get quite a coating of dust, dirt, mildew, and moisture inside
- : them as the years go by, and this can create a conductive path which
- : lets current leak from the yellow/black pair into the red/green (voice)
- : pair.
-
- : Note, though, that this is not the only reason there might be a power
- : brick hooked up to your phone system. In some areas, the phone company
- : is multiplexing two or more phone circuits onto a single wire pair,
- : using a "subscriber carrier" box (basically an ultrasonic
-
- This is called a DAML. Daml if I know what DAML means.
-
- : modulator/demodulator). These sometimes have power-bricks hooked up,
- : and the "brick" shouldn't be unplugged (it might cause one of the two
- : phone circuits to go dead when the carrier-box battery runs down).
- : --
- : Dave Platt dplatt@3do.com
- : USNAIL: The 3DO Company, Systems Software group
- : 600 Galveston Drive
- : Redwood City, CA 94063
-
- --
- #======P=G=P==k=e=y==a=v=a=i=l=a=b=l=e==u=p=o=n==r=e=q=u=e=s=t======#
- | John Lundgren - Elec Tech - Info Tech Svcs. | jlundgre@delta1 |
- | Rancho Santiago Community College District | .deltanet.com |
- | 17th St at Bristol \ Santa Ana, CA 92706 | http://rsc.rancho|
- | My opinions are my own, and not my employer's. | .cc.ca.us |
- | I have gone out to look for myself.. If I should |
- | return before I get back, hold me until I get here. |
- | "You can flame your brains out -- it won't take long." |
- #===T=u=z=l=a==C=o=m=p=a=n=y=.=.===t=h=r=e=e='=s==L=e==C=r=o=w=d=!==#
-