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The Telecom Digest for September 11, 2011
Volume 30 : Issue 227 : "text" Format
====== 30 years of TELECOM Digest -- Founded August 21, 1981 ======
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Date: Sat, 10 Sep 2011 19:28:21 +1000
From: David Clayton <dcstarbox-usenet@yahoo.com.au>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: ANCIENT telephone transmission
Message-ID: <pan.2011.09.10.09.28.18.921580@yahoo.com.au>
On Wed, 07 Sep 2011 20:36:15 -0700, mattrix wrote:
> Cast your mind back to the first decade of the last century, no computers,
> no transistors, no valves.
>
> I'm mainly interested in the situation in Australia, which may or may not
> be the same as the US/UK.
>
> The historians tell me that 600 mile lines were common, and that they
> carried multiple conversations using Frequency Division Multiplexing.
..........
I don't know what "historians" told you that, but I suspect that they "are
full of it".
From:
http://www.retro-rotary-phones.com/ccp0-display/history-of-the-telephone-exchange-in-australia.html
"..in 1907, the first inter-capital telephone trunk line was opened
between Sydney and Melbourne."
So I seriously doubt that firstly they were "Common", or that they used
FDM without active equipment.
--
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: Sat, 10 Sep 2011 13:26:21 -0700 (PDT)
From: Joseph Singer <joeofseattle@yahoo.com>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: Does SMS messaging keep going when cellular voice is down?
Message-ID: <1315686381.26308.YahooMailClassic@web161510.mail.bf1.yahoo.com>
Tue, 06 Sep 2011 19:34:36 -0400 Bill Horne <bill@horneQRM.net> wrote:
>
> I just read an email that claims cell phone text messaging (SMS) keeps
> going when cellular voice service is down. Please tell me if this is
> true or not.
It's only sort of true. What's really going on here is that if you try to
make voice calls when the network is heavily loaded with people attempting
to make calls your call attempt may fail due to lack of voice circuits to
handle your call. SMS i.e. text messages are more likely to succeed in
being sent and delivered partly because they don't use the voice circuits
or use an infinitesimal amount of the mobile infrastructure to work. Of
course it will only work if the infrastructure to process it is live and
not cut off because either the base station has lost power or the back
hall[sic Mod.] from the base station to the rest of the network has been
damaged.
Date: Sat, 10 Sep 2011 13:47:58 -0700 (PDT)
From: Joseph Singer <joeofseattle@yahoo.com>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: "Next Bus" telephone information system
Message-ID: <1315687678.13700.YahooMailClassic@web161508.mail.bf1.yahoo.com>
Thu, 8 Sep 2011 11:20:23 -0700 (PDT)HAncock4 wrote:
>
> The New York City Transit Authority has introduced a new telephone
> "app" that tells riders waiting at a bus stop when the next bus will
> come, using real time information. I'm impressed by it since it
> requires only a regular Touch Tone telephone, not any kind of 'smart
> phone', and that the information is in real time (where the buses are
> actually physically located), as opposed to using merely the schedule,
> as older applications used to do. Surface buses are subject to
> traffic delays that disrupt schedules.
>
> Passengers simply dial the number, then enter the specific bus stop
> code (posted on the bus stop sign).
Here in Seattle we have such a system called "One Bus Away"
http://www.onebusaway.org which can be accessed multiples of ways --
by smartphone, text message, web browser, or phone. The service will
let you know what buses will be coming to a specific stop, and what buses
have recently departed, by entering the stop number.
Date: Sat, 10 Sep 2011 13:37:00 -0700 (PDT)
From: Joseph Singer <joeofseattle@yahoo.com>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Cellcos ripping people off (was: Does SMS messaging keep going ...)
Message-ID: <1315687020.84334.YahooMailClassic@web161520.mail.bf1.yahoo.com>
Wed, 7 Sep 2011 11:00:12 -0400 "Michael D. Sullivan" <mds@camsul.com> wrote:
>
> SMS uses the signaling or paging channels and does not require a
> dedicated connection, and moreover does not use much "bandwidth," so
> thousands of text messages occupy the same network capacity that
> would support only one voice call.
Which is why so many of us were absolutely torqued when the cellcos
increased the cost for individual text messages from piddling to 20 cents
or more for providing the service charging 1000% or more over the price
it actually costs to provide the service. They want to force people to
buy message packages. Just recently Death Star... er AT&T changed and
where they formerly offered a package of 1,000 messages for $5 discontinued
that package so they could have only one offering "unlimited" for $20 per
month.
Date: Sun, 11 Sep 2011 09:01:15 +1000
From: David Clayton <dcstarbox-usenet@yahoo.com.au>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: Cellcos ripping people off (was: Does SMS messaging keep going ...)
Message-ID: <pan.2011.09.10.23.01.10.947891@yahoo.com.au>
On Sat, 10 Sep 2011 13:37:00 -0700, Joseph Singer wrote:
> Wed, 7 Sep 2011 11:00:12 -0400 "Michael D. Sullivan" <mds@camsul.com>
> wrote:
>>
>> SMS uses the signaling or paging channels and does not require a
>> dedicated connection, and moreover does not use much "bandwidth," so
>> thousands of text messages occupy the same network capacity that would
>> support only one voice call.
>
> Which is why so many of us were absolutely torqued when the cellcos
> increased the cost for individual text messages from piddling to 20 cents
> or more for providing the service charging 1000% or more over the price it
> actually costs to provide the service. They want to force people to buy
> message packages. Just recently Death Star... er AT&T changed and where
> they formerly offered a package of 1,000 messages for $5 discontinued that
> package so they could have only one offering "unlimited" for $20 per
> month.
While the *transmission* of SMS is fairly trivial as far as network
resources go, it still requires back-end infrastructure to potentially
store all the messages (for a certain period) in case immediate delivery
is not available so there is a cost for that which will increase with
overall SMS use.
Even with that, all telco's everywhere seem to use SMS as a high profit
"cash cow" even though (in Australia) they shot themselves in the foot for
years by keeping the price so high it discouraged use of SMS. Once the
cost dropped the use of SMS skyrocketed and the telcos made more money
than they dreamed of - whoda thunk it!
--
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: Sat, 10 Sep 2011 20:20:49 -0400
From: ajbcommconsulting@frontier.com (Jim Bennett)
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: Fuse Panel Recommendation
Message-ID: <4E6BFEE1.9050704@frontier.com>
On 2011-09-09 02:47, W wrote:
> Can someone recommend a -48V DC fuse panel for a telecom rack that would
> meet two requirements:
>
> - let us manually configure the fuse or circuit breaker for each piece of
> equipment, up to 30A per box (most equipment would be at or under 20A)
>
> - show a spot reading of the total amps in current use across all devices
> that go through the fuse panel that are currently powered on
>
Trimm makes some really nice DC fuse and breaker panels. But, if you
really want a built-in current meter, they only offer that on their 767
series panels, which are high current panels made to Verizon specs.
They are nice panels, but be prepared for sticker shock...
http://www.trimminc.com/products/verizon_products.html
Jim Bennett
**************************************************
Speaking from a secure undisclosed location.
Date: Sat, 10 Sep 2011 18:55:59 -0400
From: Monty Solomon <monty@roscom.com>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: August browser stats: Safari dominates mobile browsing
Message-ID: <p062408ddca9194fa4ada@[192.168.182.73]>
August browser stats: Safari dominates mobile browsing
By Peter Bright
Ars Technica
Our browser stats post is late this month. The source we normally
use, Net Market Share, has changed the way it reports its data. This
is good and bad. Mostly good, but it took extra time to retrieve the
data and then decide what to do with it.
The good part is that we now have separate statistics for mobile
browsers and desktop browsers. This answers long-standing demands to
break this information out to take a closer look at that small but
increasingly important market. The bad part is that the new figures
are much harder to compare to historic ones; Net Market Share has
completely separated mobile usage from desktop usage.
...
http://arstechnica.com/web/news/2011/09/august-browser-stats-mobile-safari-on-top.ars
Date: Sun, 11 Sep 2011 09:01:19 +1000
From: David Clayton <dcstarbox-usenet@yahoo.com.au>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: ANCIENT telephone transmission
Message-ID: <pan.2011.09.10.09.33.08.952704@yahoo.com.au>
On Wed, 07 Sep 2011 20:36:15 -0700, mattrix wrote:
> Cast your mind back to the first decade of the last century, no computers,
> no transistors, no valves.
>
> I'm mainly interested in the situation in Australia, which may or may not
> be the same as the US/UK.
>
> The historians tell me that 600 mile lines were common, and that they
> carried multiple conversations using Frequency Division Multiplexing.
..........
And this link indicates that carrier technology only evolved in the mid
1920's:
http://www.austehc.unimelb.edu.au/tia/535.html
--
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.
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