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Message Digest
Volume 28 : Issue 110 : "text" Format
Messages in this Issue:
Re: AT&T doubling 3G capacity
Re: Cell phone recycling: delete, then dispose
Re: size not a major consideration in wireline phone sets
Can I ring my own landline phone?
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Date: Tue, 21 Apr 2009 08:29:16 -0700 (PDT)
From: hancock4@bbs.cpcn.com
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: AT&T doubling 3G capacity
Message-ID: <7228884a-654a-458e-a06e-22773d6084e6@m19g2000yqk.googlegroups.com>
On Apr 20, 5:48 pm, Ergyn Sadiku <ergy...@gmail.com> wrote:
> Tweaks to the HSPA network will bring 3G capacity up to 7.2 Mb/s even
> before AT&T implements next-gen wireless technologies.
What is "3G" and "4G"?
> AT&T is increasing the downlink capacity on its high-speed packet
> access (HSPA) from 3.6 megabits per second to 7.2 Mb/s through
> software upgrades at the base station
I presume this HSPA is some sort of data communication. But what is
being "downlinked", and from what to what and what does that higher
speed mean in terms of service?
Will any of this improve the coarse quality of today's voice
transmissions over cell phones? Cell phone conversations are not the
easiest to make; if the speaker on either end is not careful to speak
clearly and directly into the mouthpiece, the words get "blurred" and
hard to understand.
***** Moderator's Note *****
I'm glad to see that I'm not the only one confused by all the new
acronyms.
I'm curious if any of the readers can weigh in on the trade-offs
between voice quality and bandwidth on cell phones.
Bill Horne
Temporary Moderator
------------------------------
Date: Tue, 21 Apr 2009 16:23:43 -0500
From: pv+usenet@pobox.com (PV)
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: Cell phone recycling: delete, then dispose
Message-ID: <D9CdnZA1GpnCpHPUnZ2dnUVZ_jVi4p2d@supernews.com>
"Tony Toews \[MVP\]" <ttoews@telusplanet.net> writes:
>>Overwriting a file many times, the standard way to
>>obliterate data, doesn't work.
>
>Somewhere an outfit is offering to ship you a hard drive with an erased
>file which was wiped once. If you can retrieve the data then you win a
>prize of some sort. When I read that page the contest had been running for
>a year with no winners.
Times have changed. Hard drive densities are such that the tricks that used
to be employed are now swamped in noise. If anyone can recover truly
overwritten sectors these days, they won't enter a contest because it would
be a hugely valuable trade secret or intelligence gathering asset.
>So convenional wisdom might be very wrong.
Well, conventional wisdom in deleting is to toss it in the trash, or do a
"quick format". Both of those methods are trivially reversible by anyone. *
--
* PV something like badgers--something like lizards--and something
like corkscrews.
***** Moderator's Note *****
Peter,
I love this job: it challenges my preconceived notions on a daily
basis.
(I thought|They say|Everyone knows) that you must write over a disk
sector multiple times in order to "really" erase it, or else someone
with an (Electron Microscope|Two-way Wrist TV|Super Seecrit Gov'mint
Gadget) can recover the data. The number of times you must overwrite
the data is as variable as people's opinions about whether it matters,
so lets have a discussion about how to "safely" erase a hard drive
without damaging it.
Since computerized voice answering services are subject to data
security concerns, I declare this to be telecom related.
Bill Horne
Temporary Moderator
------------------------------
Date: Tue, 21 Apr 2009 17:06:34 -0700 (PDT)
From: Joseph Singer <joeofseattle@yahoo.com>
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: size not a major consideration in wireline phone sets
Message-ID: <212042.46809.qm@web52708.mail.re2.yahoo.com>
Date: Sun, 19 Apr 2009 20:08:26 -0700 (PDT)
hancock4@bbs.cpcn.com wrote:
<<Initially cellular phones were so big that only cars
could accomodate them, though far more subscribers had access than in
the past.>>
It was the regular mobile telephones that were so big and used so much
electricity that they were trunk mounted. This was prior to cellular
phones.
Commercial cellphones didn't get commercially going til about 1983
when the AMPS ("Advanced" Mobile Phone Service) was introduced
commercially (in Chicago I believe.)
***** Moderator's Note *****
I think some of the early cellular phones were made to fit the same
mountings and use the same antenna cables as their MTS and IMTS
predecessors, so they may have been "bulky" in order to fit the old
hardware. Since cellular came long after transistorized RF decks were
common, cell phones never had to support the power demands of vacuum
tubers: ergo, they never had to be the same size unless there were
compatibility issues.
Any Motorola/GE/? techs care to chime in?
Bill Horne
Temporary Moderator
------------------------------
Date: Tue, 21 Apr 2009 13:32:30 -0500
From: "Phluge" <phluge1@yafarthoo.com>
To: redacted@invalid.telecom.csail.mit.edu
Subject: Can I ring my own landline phone?
Message-ID: <2joHl.33537$Ji5.2403@newsfe21.iad>
I have searched everywhere but I can't seem to get an answer one way or the
other. There used to be ways you could test your landline telephone's
ringer. Any suggestions?
Thanks, pflu
------------------------------
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End of the Telecom digest (4 messages)
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