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Message Digest
Volume 28 : Issue 224 : "text" Format
Messages in this Issue:
Re: Sending ringing current toward a CO on a dial tone trunk
Re: Sending ringing current toward a CO on a dial tone trunk
Re: Sending ringing current toward a CO on a dial tone trunk
Re: End of a print publication and copyright comment
Re: End of a print publication and copyright comment
Re: End of a print publication and copyright comment
Re: End of a print publication and copyright comment
Re: Hub to get early look at next-level Web link / To test high-speed 4G cellular network
Re: Woodstock--telephone/telegraph issues?
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Date: Thu, 13 Aug 2009 18:59:34 -0500
From: Michael Grigoni <michael.grigoni@cybertheque.org>
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: Sending ringing current toward a CO on a dial tone trunk
Message-ID: <4A84A8E6.2020009@cybertheque.org>
Robert Bonomi wrote:
> In article <20090812163118.GA688@telecom.csail.mit.edu>,
> Telecom digest moderator <telecomdigestsubmissions.remove-this@and-this-too.telecom.csail.mit.edu> wrote:
>> This is an unusual question, so please bear with me.
>>
>> Once of the readers has asked for help interfacing a "Local
>> Battery/Local Magneto" PBX with the PSTN, and I'm trying to think
>> "outside the cubicle", and come up with a solution that doesn't
>> require spending a lot of money.
>
>
> Depends what you consider 'a lot' <grin>
>
> Interfacing a common-battery system to a local one _is_ going to take
> a fair amount of 'glue' hardware.
'Fair amount' is just that, not an overwhelming task and actually well
documented in the 'practices' if you have them or can find them online
or elsewhere.
<snip>
> Would need some (relatively) minimal additional outboard hardware to:
> 1) detect the magneto signal, and provide an 'interrupt' to a custom
> line handler module.
I used to detect ring (interfaces I made as a kid) using a diode charge pump
feeding a darlington or fet and comparing with a threshold level.
> 2) provide isolation/transformer coupling of the divergent battery sources.
A pretty standard task; I have a Tellabs box that I often use (with various cards)
for experiments such as these.
> 3) open/close the talk path when indicated.
I trust that the operator of the cord board will do this? Otherwise one could
set up some fancy voice recognition and automation robot for this ;)
<snip>
> Can probably be done for something in the low four-figure range, all in.
Interesting how I have found different interpretations of the "figures"
expression over the years; frequently folks use that expression to refer
to the number of zeros after a significant digit in a monetary value;
do you mean in the $10k range? IMHO, with surplus hardware (e.g. old PC,
the contents of most decent 'junk boxes', and donated time), one could
do this for the cost of pizza and a movie.
Michael
------------------------------
Date: Fri, 14 Aug 2009 14:02:27 -0500
From: bonomi@host122.r-bonomi.com (Robert Bonomi)
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: Sending ringing current toward a CO on a dial tone trunk
Message-ID: <TP2dnfM1ieleKRjXnZ2dnUVZ_gKdnZ2d@posted.nuvoxcommunications>
In article <4A84A8E6.2020009@cybertheque.org>,
Michael Grigoni <michael.grigoni@cybertheque.org> wrote:
>Robert Bonomi wrote:
>> In article <20090812163118.GA688@telecom.csail.mit.edu>,
>> Telecom digest moderator
><telecomdigestsubmissions.remove-this@and-this-too.telecom.csail.mit.edu>
>wrote:
>>> This is an unusual question, so please bear with me.
>>>
>>> Once of the readers has asked for help interfacing a "Local
>>> Battery/Local Magneto" PBX with the PSTN, and I'm trying to think
>>> "outside the cubicle", and come up with a solution that doesn't
>>> require spending a lot of money.
>>
>>
>> Depends what you consider 'a lot' <grin>
>>
>> Interfacing a common-battery system to a local one _is_ going to take
>> a fair amount of 'glue' hardware.
>
>'Fair amount' is just that, not an overwhelming task and actually well
>documented in the 'practices' if you have them or can find them online
>or elsewhere.
>
><snip>
>
>> Would need some (relatively) minimal additional outboard hardware to:
>> 1) detect the magneto signal, and provide an 'interrupt' to a custom
>> line handler module.
>
>I used to detect ring (interfaces I made as a kid) using a diode charge pump
>feeding a darlington or fet and comparing with a threshold level.
>
>> 2) provide isolation/transformer coupling of the divergent battery sources.
>
>A pretty standard task; I have a Tellabs box that I often use (with various cards)
>for experiments such as these.
>
>> 3) open/close the talk path when indicated.
>
>I trust that the operator of the cord board will do this? Otherwise one could
>set up some fancy voice recognition and automation robot for this ;)
The cord-board described didn't have any interfaces for 'common battery'
circuits from a C.O. You've gotta play some games interfacing the local
battery/magneto line from the PBX the E&M board in the Asterisk "C.O."
you can build all the requisite logic in hardware, or run a 'magneto detector'
that sends a signal to the PC, and the PC goes through the gyrations needed
to take the E&M link 'off hook'. This can be done with a couple of relays,
under software control, rather than using 'hard-wired' logic.
><snip>
>
>> Can probably be done for something in the low four-figure range, all in.
>
>Interesting how I have found different interpretations of the "figures"
>expression over the years; frequently folks use that expression to refer
>to the number of zeros after a significant digit in a monetary value;
>do you mean in the $10k range?
'4 figures' means greater than $999 and less than $10,000 -- i.e. _four_
figures ($1000-9999). The 'number of zeroes' approach gives the _upper_bound_
for the range -- good for "worst-case" estimating, but significantly over-
states the 'typical' amount.
> IMHO, with surplus hardware (e.g. old PC,
>the contents of most decent 'junk boxes', and donated time), one could
>do this for the cost of pizza and a movie.
You're clearly not an accountant, are you? <grin>
I was making the assumption of a 'business' transaction, since the job _is_
for a business. That means anything used goes at 'market' rates -- can't
"afford" to deploy an 'old PC', when you look at the price of a _new_ one
that includes a *warranty*. Parts that come 'out of the junk box' are still
'inventory', and have to be replaced (at *market* prices). And the guy
coding the custom software gets paid a 'professional' rate.
Yeah, a hobbiest -- doing it solely for his own personal use/enjoyment -- could
do it for a lot less, given a reasonably-stocked junk box.
------------------------------
Date: Thu, 13 Aug 2009 20:36:35 -0700 (PDT)
From: hancock4@bbs.cpcn.com
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: Sending ringing current toward a CO on a dial tone trunk
Message-ID: <45612fc5-a14a-484f-a041-f1c0d3f5c595@g31g2000yqc.googlegroups.com>
> ***** Moderator's Note *****
>
> The PBX in question definitely does _NOT_ have any interface
> capability. I'm told it's a military-surplus model, strictly local
> battery/local magneto. I asked if it's the same as the one Gary
> Burghoff used in "M*A*S*H", but it turns out to be closer to Bebe
> Daniels in "Chickie".
So, at present, the rooms have no ability to be connected to the
outside world.
The way you describe the place, its owners, and its patrons, maybe
that's the way it should be left. Presumably the resort offices have
normal lines to the real world in case of emergency, take
reservations, and conduct business; and guests have their own
cellphones.
(Otherwise, I'm confused as to what needs to be done and why.)
------------------------------
Date: Thu, 13 Aug 2009 20:48:34 -0700 (PDT)
From: hancock4@bbs.cpcn.com
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: End of a print publication and copyright comment
Message-ID: <921bc173-595d-49fb-ab1c-6b3545ec12cd@t13g2000yqt.googlegroups.com>
On Aug 13, 8:17 pm, Steven <diespamm...@killspammers.com> wrote:
> > I believe the following request would be a great deal of work, but
> > would it be possible to scan a few of the oldest issues for the
> > Telecom Archives? (They have the Western Union Tech Review and other
> > neat old documents).
>
> I'll e-mail the publisher and see what the say, and then dig out my old
> flat bed scanner and give it a try. I wonder if they have on line archive?
If the publisher has an archive would you share the URL with us? But
I strongly doubt they'd have 30 year old stuff on it.
When you say contact the publisher I presume you mean to check about
copyright usage.
I don't follow copyrights too closely, but I understand not long ago
the time limit of a copyright law was greatly extended (others could
elaborate on the details). That is, a copyright used to expire after
so many years, with an option to renew for one second period, after
which the work would become public domain.
I can understand the desire for creators to maintain control and
receive royalties for their works, especially things like motion
pictures which were extremely expensive to produce and have a long
lifespan. This was debated in rec.arts.tv, with many feeling old
works ought to be public domain, but others recognizing not every
creator is a huge corporation and individuals deserve protection, too.
The flip side is historical documents such as 30+ year old technical
magazines and manuals. They have some historical value, but virtually
no monetary value. Copyright law does provide some exceptions of for
educational insitutions to use material without royalty in certain
circumstances. I would hope that such old manuals and journals could
get the same kind of exception.
------------------------------
Date: Fri, 14 Aug 2009 11:05:38 -0700
From: Steven <diespammers@killspammers.com>
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: End of a print publication and copyright comment
Message-ID: <h649hh$rrk$1@news.eternal-september.org>
hancock4@bbs.cpcn.com wrote:
> On Aug 13, 8:17 pm, Steven <diespamm...@killspammers.com> wrote:
>>> I believe the following request would be a great deal of work, but
>>> would it be possible to scan a few of the oldest issues for the
>>> Telecom Archives? (They have the Western Union Tech Review and other
>>> neat old documents).
>> I'll e-mail the publisher and see what the say, and then dig out my old
>> flat bed scanner and give it a try. I wonder if they have on line archive?
>
> If the publisher has an archive would you share the URL with us? But
> I strongly doubt they'd have 30 year old stuff on it.
>
> When you say contact the publisher I presume you mean to check about
> copyright usage.
>
> I don't follow copyrights too closely, but I understand not long ago
> the time limit of a copyright law was greatly extended (others could
> elaborate on the details). That is, a copyright used to expire after
> so many years, with an option to renew for one second period, after
> which the work would become public domain.
>
> I can understand the desire for creators to maintain control and
> receive royalties for their works, especially things like motion
> pictures which were extremely expensive to produce and have a long
> lifespan. This was debated in rec.arts.tv, with many feeling old
> works ought to be public domain, but others recognizing not every
> creator is a huge corporation and individuals deserve protection, too.
>
> The flip side is historical documents such as 30+ year old technical
> magazines and manuals. They have some historical value, but virtually
> no monetary value. Copyright law does provide some exceptions of for
> educational insitutions to use material without royalty in certain
> circumstances. I would hope that such old manuals and journals could
> get the same kind of exception.
>
They go back 13 years on line,here is the link, at the bottom of he
http://telephonyonline.com/ at the bottom of the page. Some problems
getting permission because of a different publisher, and on a article at
a time, some are owned by writer.
--
The only good spammer is a dead one!! Have you hunted one down today?
(c) 2009 I Kill Spammers, inc, A Rot in Hell. Co.
------------------------------
Date: Fri, 14 Aug 2009 13:30:31 -0700
From: AES <siegman@stanford.edu>
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: End of a print publication and copyright comment
Message-ID: <siegman-025EA6.13300114082009@news.stanford.edu>
In article
<921bc173-595d-49fb-ab1c-6b3545ec12cd@t13g2000yqt.googlegroups.com>,
hancock4@bbs.cpcn.com wrote:
> On Aug 13, 8:17 pm, Steven <diespamm...@killspammers.com> wrote:
> > > I believe the following request would be a great deal of work, but
> > > would it be possible to scan a few of the oldest issues for the
> > > Telecom Archives? (They have the Western Union Tech Review and other
> > > neat old documents).
> >
> > I'll e-mail the publisher and see what the say, and then dig out my old
> > flat bed scanner and give it a try. I wonder if they have on line archive?
Are those of you reading this thread aware the lifetime production run
of the new departed Bell System Technical Journal -- one of the premier
scientific journals of the world from the early '20s through the early
'80s, full of classic pioneering papers like, just for example, the
first publication of Shannon's information theory work -- is *nowhere*
available to the general public online. Scanned copies of the entire
production run are allegedly available online inside Lucent/Alcatel, but
not to anyone outside.
By contrast, the complete production run of Phys Rev is available to
researchers, universities, and other subscribers, in scanned and indexed
form, back to Vol 1, No. 1 some time in the 1890s; Science magazine back
to 1880-something; and so on.
Efforts to make all the *publicly supported* knowledge in these journals
available to the public who paid for it have thus far been unavailing.
!!! FREE THE BSTJ !!!
------------------------------
Date: Fri, 14 Aug 2009 19:28:02 -0700 (PDT)
From: hancock4@bbs.cpcn.com
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: End of a print publication and copyright comment
Message-ID: <5c7a9547-83c3-4757-a139-0fcca6185b1d@j21g2000yqe.googlegroups.com>
On Aug 14, 6:57 pm, AES <sieg...@stanford.edu> wrote:
> !!! FREE THE BSTJ !!!
> Efforts to make all the *publicly supported* knowledge in these journals
> available to the public who paid for it have thus far been unavailing.
The Bell System Technical Journal was NOT a publicly supported
document. It was "paid for" by a private corporation and subscribers
to it, not the general public.
However, it IS available for study in major libraries.
------------------------------
Date: Fri, 14 Aug 2009 14:30:53 +1000
From: David Clayton <dcstar@myrealbox.com>
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: Hub to get early look at next-level Web link / To test high-speed 4G cellular network
Message-ID: <pan.2009.08.14.04.30.52.493878@myrealbox.com>
On Thu, 13 Aug 2009 20:18:54 -0400, wdag wrote:
> "AES" <siegman@stanford.edu> wrote in message
> news:siegman-552A59.11370613082009@news.stanford.edu...
>> In article <p06240846c6a9ae5f757a@[10.0.1.3]>,
>> Monty Solomon <monty@roscom.com> wrote:
>>
>>
>> > Verizon Wireless's new network, called 4G, will have the ability to
>> >
>> >
>> Is "4G" basically the generic name for a new (or at least emerging)
>> standard -- or does Verizon have some special rights in that name?
>>
>>
> 4G is the "generic" name for new high-speed digital (i.e. video) cellular
> service. What Verizon is _not_ talking about? Who knows...
And we all look forward to "Patentable" descriptions of newer technologies
to confuse us all in the future (.....we had 286, 386 and 486, so let's
call the next one "Pentium" because we can trade-mark that.....)
Maybe "5G" wireless will be called "Fuddlestick" or something equally
meaningless?
--
Regards, David.
David Clayton
Melbourne, Victoria, Australia.
Knowledge is a measure of how many answers you have, intelligence is a
measure of how many questions you have.
------------------------------
Date: Fri, 14 Aug 2009 09:53:42 -0700 (PDT)
From: hancock4@bbs.cpcn.com
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: Woodstock--telephone/telegraph issues?
Message-ID: <844e05c6-9d52-4326-8b9b-ba1233d84af8@d32g2000yqh.googlegroups.com>
On Aug 10, 3:29 pm, hanco...@bbs.cpcn.com wrote:
> Would anyone be familiar with what special facilities, if any, Bell
> and WU set up in advance or subsequent to serve the event?
I haven't found anything specific news items.
But by coincidence, one very key event occured for the telephone
industry during Woodstock: The FCC approved MCI's request to provide
alternative service between Chicago and St. Louis by a close vote.
Dissenters warned that this approval was cream skimming would
utlimately force AT&T to raise rates elsewhere.
I also found that in towns near Woodstock, townsfolk organized as
volunteers to help sick, injured, and hungry kids from the Festival.
An infirmary was set up to treat minor ailments with serious cases
sent to area hospitals. Hundreds of simple meals were prepared by
residents.
Although the traditional telegram was on the wane by 1969, WU
telegraph service played a critical role in the handling of Robert
Kennedy's funeral. Notices and invitations to ride the train and
attend the funeral were sent out by telegram.
------------------------------
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