30 Years of the Digest ... founded August 21, 1981
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The Telecom Digest for June 21, 2012
Volume 31 : Issue 151 : "text" Format
====== 30 years of TELECOM Digest -- Founded August 21, 1981 ======
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Telecom and VOIP (Voice over Internet Protocol) Digest for the
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Date: Wed, 20 Jun 2012 09:55:53 -0700 (PDT)
From: HAncock4 <withheld@invalid.telecom-digest.org>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: AT&T Tech Channel--Cyber Security News, history
Message-ID: <9038eb81-881b-4806-aa1d-1de7853f13cc@d17g2000vbv.googlegroups.com>
The AT&T website has many videos available. They have a weekly
series, "AT&T ThreatTraq", formerly known as the "Cyber Threat
Report". This week's report discuss the week's top cyber security
news, and share news on the current trends of malware, spam, and
internet anomalies observed on the AT&T Network. Older videos are
available discussing a wide variety of cyber security topics. (The
bottom portion of the frame has an index of other available videos).
http://techchannel.att.com/play-video.cfm/2012/6/19/ThreatTraq-Xen-MySQL-F5-Internet-Weather
In addition, this website has historical AT&T films dating back
decades. This includes instructions on how to dial for subscribers
being converted from manual to dial service, how long distance calls
are placed in 1940 (all toll ticket handling was completely manual,
handled by a battery of clerks), introduction of various new services,
new Bell Labs inventions, and telephone courtesy.
The 1941 Long Distance Service video may be viewed at:
http://techchannel.att.com/play-video.cfm/2012/6/4/AT&T-Archives-Long-Distance-Service
The bottom of the frame has an index to other historical and
contemporary videos.
Date: 20 Jun 2012 20:43:43 -0300
From: Mike Spencer <mds@bogus.nodomain.nowhere>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: Ring voltage measurment question
Message-ID: <8762al7dn4.fsf@nudel.nodomain.nowhere>
bonomi@host122.r-bonomi.com (Robert Bonomi) writes:
> In article <87wr37hl3d.fsf@nudel.nodomain.nowhere>,
> Mike Spencer <mds@bogus.nodomain.nowhere> wrote:
>
>>Would the telco device that actually generated my ring voltage be
>>located in that DLC/RLC/box?
>
> IF the box contains =just= cross-connects of copper pairs, then the
> subscriber loop extends through the box, and ring-generator circuitry
> somewhere closer to, if not actually in, the C.O.
>
> OTOH, if the box is a termination for some form of high cap circuit, from
> the C.O., de-multiplexing it onto the individual copper pairs providing
> POTS service to subscribers, then the ring-generator circuitry IS, without
> question, in that box.
>
> I would say that it is "probable", maybe even "highly probable", that the
> box which your service goes through is a high cap termination, not just
> a cross-connect.
At one point, 8 or so years ago, a management guy (pinch-hitting for
striking techs) claimed to have replaced a "circuit board" in the
cabinet in question. Small factoidal evidence for "probable".
I still find it hard to believe that a Bell Aliant tech told me stuff
that, according to y'all here on c.d.t. and others elsewhere, was
flatly wrong. Working on it.
> But the Law of Perverse Statistics comes into play as well -- in any
> specific situation, the particular 'thing' in question is all too
> often NOT what is commonly found in that situation, and the more you
> -want- it to be that thing, the more likely it is 'something else'.
> <wry grin>
I've been both bitten and blessed that LoPS.
Tnx,
--
Mike Spencer Nova Scotia, Canada
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