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The Telecom Digest for June 07, 2010
Volume 29 : Issue 153 : "text" Format
Messages in this Issue:
Re: DSL and filters for old phones--question (Bob K)
Re: DSL and filters for old phones--question (David Kaye)
Please tell me if you like the new look and feel (Bill Horne)
Re: DSL and filters for old phones--question (Rich Greenberg)
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Date: Sun, 06 Jun 2010 01:24:45 -0400
From: Bob K <SPAMpot@Frontiernet.net>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: DSL and filters for old phones--question
Message-ID: <4C0B311D.8040803@Frontiernet.net>
On 6/5/2010 5:29 PM, David Kaye wrote:
> Bob K<SPAMpot@Frontiernet.net> wrote:
>
>> Filtering the entire legacy phone wiring helps protect the DSL signal
>>from losses due to poor installations or lossy phone wires. I ran into
>> a situation where the yellow wire had been connected to one of the
>> signal wires (red or green) for some reason, [....]
>
> Isn't that the standard way "private line" phones were wired from the days
> when party lines were in existence? As I recall splitting out the 3rd wire
> and putting a capacitor or a diode or something on it allowed two different
> ringing schemes to be used (pulsed DC one way for one phone and pulsed DC the
> other way for the other phone on the same line).
>
In this area, the yellow wire was connected to ground at the demarc --
and if you had a Princess type phone that needed power for lights, that
power was supplied from a transformer and fed along the black wire,
using the yellow for return.
Lots of homes had been wired with just 3-wire cable.
You are right on the ringing. Party-line ringing was accomplished by
using the 4 possible combinations of pulsed DC from each side of the
talk pair (red and green) to ground. But, the yellow should never have
been connected directly to the red or green.
In my daughter's house a satellite TV installer plugged a receiver into
a phone jack without thinking about a filter. That almost completely
killed the DSL signal. Using the whole-house filter idea, that type of
thing would not happen.
Someone else here posted that filters aren't always needed. The filters
eliminate the strange sounds a DSL signal might generate in a telephone,
but with some phones that would not be a problem. That satellite
receiver could care less about a noisy line -- it only had to check for
a dial tone once a day. Maybe you can put up with some buzzing on an
answering machine.
But, the filters also keep some phones and other things from sucking out
the DSL signal. Without them, your DSL might still work, but just not
work as good as it could.
....Bob
Date: Sun, 06 Jun 2010 21:37:16 GMT
From: sfdavidkaye2@yahoo.com (David Kaye)
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: DSL and filters for old phones--question
Message-ID: <huh4ea$t2n$5@news.eternal-september.org>
Bob K <SPAMpot@Frontiernet.net> wrote:
>In this area, the yellow wire was connected to ground at the demarc --
>and if you had a Princess type phone that needed power for lights, that
>power was supplied from a transformer and fed along the black wire,
>using the yellow for return.
The Princess phones came along after party lines were all but abandoned, thus
the new use for the yellow wire. But indeed, the yellow was used as part of
the party line ringing circuit.
Here is a schematic of the Model 500 Bell phone. Note that it has red, green,
and yellow wires (and no black at all). The arrow points to the place where
the ringer wire had been separated out to the yellow wire during party line
service, but for private line service it is merged onto the green wire and the
yellow is no longer connected to anything.
http://www.porticus.org/bell/pdf/500_modification.pdf
Date: Sun, 6 Jun 2010 11:46:00 -0400
From: Bill Horne <bill@horneQRM.net>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Please tell me if you like the new look and feel
Message-ID: <sPOdnfjLU63IKDLXnZ2dnUVZ_j2dnZ2d@speakeasy.net>
I'm experimenting with a new look and feel for the online version of
the Telecom Digest. Please take a look at today's Digest in it's new
form, and feedback your opinions offline.
I've included a link to the "stanard" Digest for comparison.
TIA.
Bill Horne
The New Version:
http://massis.lcs.mit.edu/telecom-archives/archives/back.issues/recent.single.issues/daily-alt.html
The Ordinary Version:
http://massis.lcs.mit.edu/telecom-archives/archives/back.issues/recent.single.issues/latest-issue.html
Date: Sun, 6 Jun 2010 19:27:52 +0000 (UTC)
From: richgr@panix.com (Rich Greenberg)
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: DSL and filters for old phones--question
Message-ID: <hugsro$mtm$1@reader1.panix.com>
In article <135b830e-e2e4-45ed-aae8-9e6de224792b@l6g2000vbo.googlegroups.com>,
Jeff <hancock4@bbs.cpcn.com> wrote:
>I would like to get DSL. However, I have an older 554 (wall rotary
>dial) phone hard wired and mounted on the wall. The phone is in
>regular use.
[...]
>***** Moderator's Note *****
>Here in my house, when I got DSL, I went to the cellar, installed two
>modular jacks next to the inlet point of the drop wire, and connected
>one jack to the incoming line, and the other to my old "JK" wire to
>feed the house phones. Then, I plugged in a DSL filter between them.
>
>There's only one filter for every phone, and I didn't need to touch
>anything else. I recommend the method for all DSL installations.
Our esteemed moderator is correct here. At my previous house I did the
same thing, but completely in the NIJ box. It was a 6 line NIJ with
only one line in use. (the previous owners of the house had 3 lines.)
Most of the jacks were "home run" to the NIJ so it was easy to isolate
the one going to my DSL modem. I plugged the DSL filter into the line 1
jack and plugged the leads from 2 of the other lines into the DSL &
phone outputs, then moved the wireing from the line 1 terminals to the
other line's terminals for voice & DSL.
That worked fine for a few years until I needed a service call (for a
problem outside of my house not related to my wireing). The tech looked
at my filter installation and said "I can do it better than that", and
he did. He removed the line 1 terminal block and replaced it with one
having the DSL filter built in, moved the wires back to it. Worked fine
and was in use until I moved.
took the lead
--
Rich Greenberg Sarasota, FL, USA richgr atsign panix.com + 1 941 378 2097
Eastern time. N6LRT I speak for myself & my dogs only. VM'er since CP-67
Canines:Val, Red, Shasta & Casey (RIP), Red & Zero, Siberians Owner:Chinook-L
Retired at the beach Asst Owner:Sibernet-L
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End of The Telecom Digest (4 messages)
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