There are some things that mortal men are not supposed to know, and
this web page has a breezy, lightweight, breathless explanation of one
of them - how our government, having allowed our "public utilities" to
sabotage a reliable communications network that was working fine for
146 years, has now decided to use our tax money to achieve a goal that
I didn't know existed and still can hardly believe was ever consideed
viable - constructing another cellular network in parallel with the ever-more-expensive, overly complicated, incredibly delicate network
of eyesores that ruin our landscape, turn our church steeples into
plastic monuments to mamon, and cause a generation of children to
become soulless automatons, unable to relate to other people inches
away from them, as they frantically flip through page after page after
page of images showing endless clones of a blow-dried-airhead telling
them to buy a new product while simpering and preening and trying
harder to look like whatever flavor of sincere is
Firstnet-fashionable.

Perhaps you will be able to make more sense out of it. My circuit
breaker has tripped.

Bill

- - - - - - - - - - - - - - - - - - - - - - - - - - -

"An official website of the United States government"

What's the news? AT&T is America's public safety communications
partner. In the nearly 5 years since we were selected by the First
Responder Network Authority (FirstNet Authority) to build and operate FirstNet(r), we have moved quickly to bring more coverage, boost
capacity and drive new capabilities for South Carolina first
responders and the communities they serve - rural or urban.

Today, we cover nearly all of the state with FirstNet, Built with AT&T
- helping to connect public safety agencies and organizations in more
than 150 communities across South Carolina. That's why we're focused
on increasing network capacity for South Carolina public safety by
deploying Band 14 spectrum - nationwide, high-quality spectrum set
aside by the federal government specifically for FirstNet. We've
rolled out Band 14 on over 1,000 sites across the state to provide
public safety with truly dedicated coverage and capacity when they
need it.

In addition, more South Carolina first responders are gaining access
to a one-of-a-kind 5G experience on FirstNet. 5G connectivity on
FirstNet is now available in Charleston and Hilton Head.

And we aren't stopping there. The FCC estimates that over 10,000 lives
could be saved each year if public safety were able to reach callers
just 1 minute faster. And since 80% of wireless calls take place
indoors, in-building dedicated public safety connectivity is essential
to public safety operations and overall safety. That's why we are
collaborating with Safer Building Coalition, the nation's leading
industry advocacy group focused on advancing policies, ideas, and
technologies that ensure effective in-building communications
capabilities for public safety personnel and the people they serve.

https://www.firstnet.gov/newsroom/press-releases/firstnet-built-att-connecting-more-first-responders-across-south-carolina

--
(Please remove QRM from my email address to write to me directly)

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On 3/31/2022 11:39 AM, Bill Horne wrote:

...
Perhaps you will be able to make more sense out of it. My circuit
breaker has tripped.

Bill

- - - - - - - - - - - - - - - - - - - - - - - - - - -

"An official website of the United States government"

What's the news? AT&T is America's public safety communications
partner. In the nearly 5 years since we were selected by the First
Responder Network Authority (FirstNet Authority) to build and operate FirstNet(r), we have moved quickly to bring more coverage, boost
capacity and drive new capabilities for South Carolina first
responders and the communities they serve - rural or urban.

I'm not exactly an uncritical fan of FirstNet, having been fairly
close to the process that created it, and having worked with real
public safety communications. There was a real mess in the 2005-2009
time frame, not worth recounting here, and it basically ended with
AT&T picking up the pieces. But the idea is not bad and it could be
useful.

FirstNet is a "broadband" public safety network intended to complement
the "narrowband" voice walkie-talkie systems that first responders
(police, fire, EMS) typically carry. It's basically a 700 MHz LTE
network, where the 700 MHz band has good indoor and cluttered-area
coverage. The idea is that AT&T gets to use the spectrum for
commercial (cellular) customers, but reserves and prioritizes its use
for first responders when they need it. FirstNet's customers, the
first responders, pay for the service, which allows them to download
images and video, which could help them in their front line work.

Not all first responders buy into this; real-world police in many
places, for instance, carry ordinary smartphones, which generally work
fine. But in some places where cell coverage is spotty, FirstNet gives
AT&T an incentive to build out, and it gives local governments an
incentive to permit the necessary towers to be built. Whether that's
good or bad is a matter of perspective...

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On Fri, Apr 01, 2022 at 08:52:33AM -0400, Fred Goldstein wrote:

On 3/31/2022 11:39 AM, Bill Horne wrote:

...
Perhaps you will be able to make more sense out of it. My circuit
breaker has tripped.

Bill

- - - - - - - - - - - - - - - - - - - - - - - - - - -

"An official website of the United States government"

What's the news? AT&T is America's public safety communications
partner. In the nearly 5 years since we were selected by the First >Responder Network Authority (FirstNet Authority) to build and operate >FirstNet(r), we have moved quickly to bring more coverage, boost
capacity and drive new capabilities for South Carolina first
responders and the communities they serve - rural or urban.

I'm not exactly an uncritical fan of FirstNet, having been fairly
close to the process that created it, and having worked with real
public safety communications. There was a real mess in the 2005-2009
time frame, not worth recounting here, and it basically ended with
AT&T picking up the pieces. But the idea is not bad and it could be
useful.

One of the things that happens when I take a vacation from the Digest
is that I come back to work with "new eyes" - I notice things that
weren't grabbing my attention before, and I've just realized that I
don't know as much about radio and Cellular technology as I had
thought I did.

Ergo, I'll ask you to give us more detail about the underlying
technology behind FIrstNet(R), and to explain some of the acronyms
that have been mentioned. I hate to do it, but I'll (respectfully)
request an "Executive Overview" that gives a layman's view of the
possibilities and problems.

FirstNet is a "broadband" public safety network intended to complement
the "narrowband" voice walkie-talkie systems that first responders
(police, fire, EMS) typically carry.

OK, here's my first double-take: my only experience with two-way radio technology, outside Amateur radio, was fixing the radios in the snow
plows and staff cars used by the Commonwealth of Massachusetts, back
in 1972. At that time, "Narrowband" was what we called FM two-way
radios that were set for plus-and-minus 5KHz deviation. However, I've
been told that "Narrowband" now refers to radio transmitters using plus-and-minus 2.5KHz deviation, and "Wideband" is the older +/- 5KHz
system.

Pleae tell us if I'm right, and what that change did to increase the
available bandwidth in the bands used by First Responders, and why
FirstNet is considered "Wideband."

It's basically a 700 MHz LTE network, where the 700 MHz band has
good indoor and cluttered-area coverage. The idea is that AT&T gets
to use the spectrum for commercial (cellular) customers, but
reserves and prioritizes its use for first responders when they need
it. FirstNet's customers, the first responders, pay for the service,
which allows them to download images and video, which could help
them in their front line work.

IIRC, 700 MHz was the range used for "trunked" two-way push-to-talk
systems: I thought it was still being used for that. Correct me if I'm
wrong, though: didn't T-Mobile have it's "Push-To_Talk" service in
that band as well?

And, Ghod forgive me, I have to ask what "LTE" means in this
context. Trunked radio systems are now decades old, so if that's what
AT&T is calling "Long Term Evolution," well, I want my tax money back.

Not all first responders buy into this; real-world police in many
places, for instance, carry ordinary smartphones, which generally work
fine. But in some places where cell coverage is spotty, FirstNet gives
AT&T an incentive to build out, and it gives local governments an
incentive to permit the necessary towers to be built. Whether that's
good or bad is a matter of perspective...

Let's pull over into the learning lane for a moment, and I'll ask a
few questions I hope will clarify what is going on.

1. Is FirstNet(R) a service that uses single-channel radios, like the
ones that Police used to have for their exclusive use, or is it for
"trunked" radios like the ones taxicabs, courier services, and
delivery trucks use now? Some Police and Fire departments have
switched to "trunked" systems, because some municipalities have
combined all their departments onto a single "trunked" system in an
effort to save money.

2. If FirstNet is a "Wideband" service that allows First Responders to
"download images and video," how can it be shared with older
"narrowband" Release-To-Listen users? Are there multiple systems with
different capabilities sharing the FirstNet band(s)?

3. Unless I misunderstand the FirstNet PR, the system is equipped to
allow First Responders to interrupt existing "other" users when
First Responders make a call. Is that correct? Is there any public
info you can point us to?

Thanks for your help. I'm sorry to have to ask what are probably very
basic questions to you, but I need to have a common basis of under-
standing if the Digest is to have cogent threads about issues and
systems such as FirstNet.

Bill

--
Bill Horne
Telecom Digest Moderator

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* Origin: fsxNet Usenet Gateway (21:1/5)

On 4/1/2022 8:28 PM, Telecom Digest Moderator wrote:

...
One of the things that happens when I take a vacation from the Digest
is that I come to work with "nw eyes" - I notice things that weren't
grabbing my attention before, and I've just realized that I don't know
as much about radio and Cellular technology as I had thought I did.

Ergo, I'll ask you to give us more detail about the underlying
technology behind FIrstNet(R), and to explain some of the acronyms
that have been mentioned. I hate to do it, but I'll (respectfully)
request an "Executive Overview" that gives a layman's view of the possibilities and problems.

Happy to oblige.

FirstNet is a "broadband" public safety network intended to complement
the "narrowband" voice walkie-talkie systems that first responders
(police, fire, EMS) typically carry.

OK, here's my first double-take: my only experience with two-way radio technology, outside Amateur radio, was fixing the radios in the snow
plows and staff cars used by the Commonwealth of Massachusetts, back
in 1972. At that time, "Narrowband" was what we called FM two-way
radios that were set for plus-and-minus 5KHz deviation. However, I've
been told that "Narrowband" now refers to radio transmitters using plus-and-minus 2.5KHz deviation, and "Wideband" is the older +/- 5KHz
system.

Pleae tell us if I'm right, and what that change did to increase the available bandwidth in the bands used by First Responders, and why
FirstNet is considered "Wideband."

"Broadband" in the modern sense means that it supports more than
voice, and supports high-bandwidth applications like video. Think
high-speed Internet access, in this case via smartphones. FirstNet is
a cellular network, just one with special features for first
responders.

It's basically a 700 MHz LTE network, where the 700 MHz band has
good indoor and cluttered-area coverage. The idea is that AT&T gets
to use the spectrum for commercial (cellular) customers, but
reserves and prioritizes its use for first responders when they need
it. FirstNet's customers, the first responders, pay for the service,
which allows them to download images and video, which could help
them in their front line work.

IIRC, 700 MHz was the range used for "trunked" two-way push-to-talk
systems: I thought it was still being used for that. Correct me if I'm
wrong, though: didn't T-Mobile have it's "Push-To_Talk" service in
that band as well?

No. 700 MHz was TV channels 51-69, repurposed for mobile use around 15
years ago via the DTV transition. Trunked two-way uses frequencies in
the 800 MHz range (near but not the same ones as cellular) and on the
older UHF band (450-470 MHz). - When the second 700 MHz auction - was
being planned, there was a proposal on the table to reserve some for
first responders, and that ended up in FirstNet.

And, Ghod forgive me, I have to ask what "LTE" means in this
context. Trunked radio systems are now decades old, so if that's what
AT&T is calling "Long Term Evolution," well, I want my tax money back.

LTE is the name of the "4G" air interface, which has been the standard
for at least a decade. Since the 3G networks are being shut down, your
mobile phone either has LTE or it won't work. "5G" has an air
interface called "NR", for New Radio, but that is really just a set of evolutionary changes to LTE to support higher frequencies, wider
channels, multi-band aggregation, and similar tweaks. To make a long
story short, LTE uses full-channel OFDM in the downlink (base to
mobile) while the uplink divides the channel into narrower
sub-channels called Resource Blocks and thus allows multiple mobile
units to transmit at once. OFDM means that there are multiple
narrowband carriers, 15 kHz apart in LTE (can be more in NR), across
which the payload is divided. It's a basket of clever ideas (and
maybe some weird ones) thrown together by committee.

Not all first responders buy into this; real-world police in many
places, for instance, carry ordinary smartphones, which generally work
fine. But in some places where cell coverage is spotty, FirstNet gives
AT&T an incentive to build out, and it gives local governments an
incentive to permit the necessary towers to be built. Whether that's
good or bad is a matter of perspective...

Let's pull over into the learning lane for a moment, and I'll ask a
few questions I hope will clarify what is going on.

1. Is FirstNet(R) a service that uses single-channel radios, like the
ones that Police used to have for their exclusive use, or is it for
"trunked" radios like the ones taxicabs, courier services, and
delivery trucks use now? Some Police and Fire departments have
switched to "trunked" systems, because some municipalities have
cobined all their services into a single "trunked" system in an
effort to save money.

It uses a conventional cellular phone, so the channels are wide and
allocated using LTE's methods. Trunked systems are voice systems with
a lot of narrowband voice channels assigned on demand. Totally
different.

2. If FirstNet is a "Wideband" service that allows First Responders to
"download images and video," how can it be shared with older
"narrowband" push-to-talk users? Are there multiple systems with
different capabilities sharing the FirstNet band(s)?

It is totally separate from old PTT. It may synthesize PTT but that's
an "app". The network is full duplex with paired (frequency division
duplex) channels.

3. Unless I misunderstand the FirstNet PR, the system is equipped to
allow First Responders to interrupt existing "other" users when
First Responders make a call. Is that correct? Is there any public
info you can point us to?

LTE supports a lot of simultaneous users per cell, and divides
capacity among them. FirstNet prioritizes first responders, so if
there is a shortage of capacity on a cell, first responders get theirs
first, and ordinary cellular users either get less capacity or in
extreme cases may get thrown off. Basically the license is divided
into a cellular channel and a first responder channel, and the first
responder channel's share of capacity is available to cellular users
when first responders don't need it.

--
Fred R. Goldstein k1io fred "at" ionary.com
+1 617 795 2701

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