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How will 911 work with AC2?

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Anonymous
March 16, 2005 10:02:24 PM

Archived from groups: alt.cellular.verizon (More info?)

Back a few years, the common knowledge is that 911 found any signal
available and disregarded the PRL. Does anyone know the specifics, for
example, will 911 calls:
-only look in 800MHZ A/B for non PRL carriers?
-look in all PCS channels (even if not in the PRL)?
-look in any channels with NEG entries the PRL?

While I'm at it, on the phone models where the "emergency" number can
be changed in debug mode, what happens if you reprogram it to call a
normal number. Will the phone do an "any carrier" search for the
number (assuming an inter-carrier auto-roam agreement exists)?

Just curosities as I ponder the thought of switching from AC1 to AC2.

-MVL

More about : 911 work ac2

Anonymous
March 17, 2005 8:47:16 AM

Archived from groups: alt.cellular.verizon (More info?)

mvl_groups_user@yahoo.com wrote:
> Back a few years, the common knowledge is that 911 found any signal
> available and disregarded the PRL. Does anyone know the specifics, for
> example, will 911 calls:
> -only look in 800MHZ A/B for non PRL carriers?
> -look in all PCS channels (even if not in the PRL)?
> -look in any channels with NEG entries the PRL?
>
> While I'm at it, on the phone models where the "emergency" number can
> be changed in debug mode, what happens if you reprogram it to call a
> normal number. Will the phone do an "any carrier" search for the
> number (assuming an inter-carrier auto-roam agreement exists)?
>
> Just curosities as I ponder the thought of switching from AC1 to AC2.

I know that "Emergency" mode will do an A/B scan and ignore *all* PRL
restrictions. Roaming agreements are irrelevant for 911 calls. PCS is a
bit harder, since the pilot channels are not in fixed "places", as they
are for A/B, and the PRL says where to look for them. There might be a
fixed set of channels which are in fact the only ones that in practice
are ever used, but I don't know this for certain. I suppose as a last
resort, it could just brute-force scan every PCS channel looking for
pilot signals.

You could program your phone to treat some ordinary number as
"emergency", but the system you would be roaming on would treat it as an
ordinary call, so when the roaming system went to VZW to authorize the
call, you would probably get kicked out (or charged $$).

The bottom line is, AC2 and AC2 will have identical behavior for 911
calls: if the phone is physically able to complete the call, it will go
through.
Anonymous
March 17, 2005 5:46:57 PM

Archived from groups: alt.cellular.verizon (More info?)

Yes, you said it perfectly. If there is 911 service to be had, your phone
will connect to it. Doesn't matter what plan you are on! Oddly enough,
under AC2, you won't know if you can connect to 911 unless you try it. So
on AC2, if your phone says no service, it doesn't necessarily mean no 911
service.

I might have missed it, but I "hope" that all the carriers work this way.
Although I find the thought that you are in an emergency situation, you open
your phone and it says "no service" it means No Service!. But if all the
majors have two "flavors" no service (with 911 if it is available) and no
service meaning that there is no cell phone of any kind to your handset a
bit of a "risk"

How many movies have you seen; person in trouble, opens their phone, it says
no service, toss the phone, and find another way to get help. Imagine the
liability if there really was service, and the information on the phone
results in loss of property/life/time. I wonder if that has ever been
litigated. <gulp>.

But to restate: no matter what your plan, what your phone, if a 911 call
can be made with the technology that your phone is sensing, it will! Count
on it (maybe).

--
dr. wireMORE (don't accept "less", demand "more")
Wireless Consultant/Engineer & Midwest VZW Master Agent
Data, wi-fi, national access, smartphones, and home
computer healthchecks, stop worrying... just ask for the dr.

If you need specific help, leave your email address & we'll try to contact
you. Worred about leaving your email address..... yup, me too.
"CharlesH" <hoch@exemplary.invalid> wrote in message
news:ER8_d.19584$Pz7.18967@newssvr13.news.prodigy.com...
> mvl_groups_user@yahoo.com wrote:
<snip>
>> Just curosities as I ponder the thought of switching from AC1 to AC2.
>
> I know that "Emergency" mode will do an A/B scan and ignore *all* PRL
> restrictions. Roaming agreements are irrelevant for 911 calls. PCS is a
<snip>
> The bottom line is, AC2 and AC2 will have identical behavior for 911
> calls: if the phone is physically able to complete the call, it will go
> through.
Related resources
Anonymous
March 17, 2005 8:23:38 PM

Archived from groups: alt.cellular.verizon (More info?)

It is alleged that dr.wireMORE@VZW-MidWESTma claimed:

; I might have missed it, but I "hope" that all the carriers work this way.
; Although I find the thought that you are in an emergency situation, you open
; your phone and it says "no service" it means No Service!. But if all the
; majors have two "flavors" no service (with 911 if it is available) and no
; service meaning that there is no cell phone of any kind to your handset a
; bit of a "risk"

I've always assumed that "no service" was a matter of lack of signal,
not the tower telling you to go away.

--
Jeffrey Kaplan www.gordol.org
The from userid is killfiled Send personal mail to gordol

"There he is, on the Hell Mouth. All day every day. And that's gotta
be like being showered with evil. Only, from underneath." "Not really
a shower." "A bidet. Like a bidet of evil." - (Buffy and Willow,
"Buffy the Vampire Slayer")
Anonymous
March 17, 2005 8:23:39 PM

Archived from groups: alt.cellular.verizon (More info?)

Jeffrey Kaplan wrote:
> It is alleged that dr.wireMORE@VZW-MidWESTma claimed:
>
> ; I might have missed it, but I "hope" that all the
> carriers work this way. ; Although I find the thought
> that you are in an emergency situation, you open ; your
> phone and it says "no service" it means No Service!. But
> if all the ; majors have two "flavors" no service (with
> 911 if it is available) and no ; service meaning that
> there is no cell phone of any kind to your handset a ;
> bit of a "risk"
>
> I've always assumed that "no service" was a matter of
> lack of signal, not the tower telling you to go away.

First, the tower never tells you to go away. The phone
may decide not to listen.

There is signal (or not) at the RF section of the phone.
Then the software/firmware decides if the user sees
no service or not. You could have a useable signal and
see no service. When you dial 911 the software will
override the PRL, preferences, etc. and talk to any
useable signal.

-Quick
Anonymous
March 17, 2005 8:23:40 PM

Archived from groups: alt.cellular.verizon (More info?)

Quick wrote:
>
> First, the tower never tells you to go away. The phone
> may decide not to listen.

I'll take that back... If you keep shouting after the tower
has told you to quiet it down a bit it will tell you to go away.

-Quick
!