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The Telecom Digest for March 28, 2012
Volume 31 : Issue 81 : "text" Format
Messages in this Issue:
Re: T1 Carrier--What Hath Bell Labs Wrought? The Future (HAncock4)
Worst ISP that has ever and could ever exist (Bill Horne)
Verizon Wireless Customer Service Is So Terrible, I Actually Miss AT&T (Bill Horne)

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Date: Tue, 27 Mar 2012 12:31:48 -0700 (PDT) From: HAncock4 <withheld@invalid.telecom-digest.org> To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org. Subject: Re: T1 Carrier--What Hath Bell Labs Wrought? The Future Message-ID: <2c5ee280-7b6f-4d83-b170-0d42148142ab@i2g2000vbv.googlegroups.com> > ***** Moderator's Note ***** > The gap between the Labs and the field caused some very severe errors: > most notably, the choice of an 8,000 Hz sample rate for the T-1 > carrier system. Although it was Shannon's work that predicted the need > for a sample rate of at least twice the highest frequency to be > reproduced, the T-1 designers didn't do the field trials which would > have revealed that sampling ambiguities at even sub-multiples of the > "chop" rate would make 1,000 Hz test tones unusable. This is the > reason that "Milliwatt" test tones are now slightly offset from 1,000 > Hz - but I can only imaging the cost of rework and redesign that > far-reaching error caused. The following article describes the T1 system in technical detail, including 'framing' and synchronization. On page 1440, they describe how they use the 1,000 Hz tone for testing purposes, and other test procedures and equipment for T1. http://www.alcatel-lucent.com/bstj/vol44-1965/articles/bstj44-7-1405.pdf The BSTJ says T1 was based on earlier experiments, including field trials, of the PCM (Pulse Code Modulation) system. A January 1962 BSTJ article provides a technical overview of experimental results: http://www.alcatel-lucent.com/bstj/vol41-1962/articles/bstj41-1-1.pdf The January 1962 BSTJ issue has several PCM articles in addition to the above. Table of Contents: http://www.alcatel-lucent.com/bstj/vol41-1962/bstj-vol41-issue01.html (Note that the BSTJ articles run from 12 meg to 25 meg).
Date: Tue, 27 Mar 2012 19:36:33 -0400 From: Bill Horne <bill@horneQRM.net> To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org. Subject: Worst ISP that has ever and could ever exist Message-ID: <jktiu2$eq8$1@dont-email.me> CenturyLink continues to draw the ire of various consumers: CenturyLink is not only the worst ISP in the world, but is indisputably the worst provider of any service in human history. 300-500ms latency spikes at all times. Always over 50ms to the first hop (usually several times that.) Even with ancient technology this is not realistically possible. The only explanation is that their NIDs and hubs are nests of baling wire. http://centurylink.pissedconsumer.com/worst-isp-that-has-ever-and-could-ever-exist-20120327307917.html -or- http://tinyurl.com/7w4wsfk -- Bill Horne (Remove QRM from my address to write to me directly)
Date: Tue, 27 Mar 2012 19:43:19 -0400 From: Bill Horne <bill@horneQRM.net> To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org. Subject: Verizon Wireless Customer Service Is So Terrible, I Actually Miss AT&T Message-ID: <jktjap$ghh$1@dont-email.me> I found this on The Consumerist site: Verizon Wireless Customer Service Is So Terrible, I Actually Miss AT&T By Mary Beth Quirk on March 2, 2012 4:00 PM Peter thought he was doing something pretty sweet thing for Verizon Wireless. After fours years with AT&T, not only was he switching over, but he was bringing a total of four phones with her. So forgive him for assuming that maybe Verizon wouldn't make the entire experience a completely miserable one. When we say miserable, we mean it -- reading through Peter's sage brought to mind climbing up Mt. Everest in a blizzard wearing only flip-flops. http://consumerist.com/2012/03/verizon-wireless-customer-service-is-so-terrible-i-actually-miss-att.html -or- http://tinyurl.com/7o49kt5 -- Bill Horne (Remove QRM from my address to write to me directly)
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