Archived from groups: alt.cellular.verizon (
More info?)
Peter Pan wrote:
> "Quick" <quick7135-news@NOSPAMyahoo.com> wrote in message
> news:1092419279.614411@sj-nntpcache-3...
>> Peter Pan wrote:
>>> "Quick" <quick7135-news@NOSPAMyahoo.com> wrote in message
>>> news:1092344789.777373@sj-nntpcache-3...
>>>> Peter Pan wrote:
>>>>> "Notan" <notan@ddress.com> wrote in message
>>>>> news:411BB176.52483893@ddress.com...
>>>>>> Isaiah Beard wrote:
>>>>>>>
>>>>>>> Buck Turgidson wrote:
>>>>>>>
>>>>>>>> I am curious to know how cutting the cord has worked out for
>>>>>>>> those who've done it. We have 2 young children, and I am
>>>>>>>> wondering if it would work for us.
>>>>>>>
>>>>>>> So far, so good. No landline phone here for going on four years
>>>>>>> now, and haven't really missed it.
>>>>>>>
>>>>>>> The key to cutting the cord is making sure the cell coverage is
>>>>>>> VERY good where you live. As long as the signal is strong, most
>>>>>>> people won't even realize you're on a cell phone when they call
>>>>>>> you.
>>>>>>
>>>>>> Obviously, no need for a fax machine. Correct?
>>>>>>
>>>>>> Notan
>>>>>
>>>>> What the H does that have to do with it? There are many options
>>>>> for using fax with cellphones. There are even options for using a
>>>>> cellphone with the inhouse phone wiring so you can use any of the
>>>>> phones (and fax) in your home with the cellphone rather than a
>>>>> landline.
>>>>
>>>> Could be an issue. The fax machine will dial the number of the
>>>> far end fax machine. The cell phone/socket has no way of knowing
>>>> its a data call and will simply dial the number as a voice call.
>>>> When you use your cell phone as a modem/browser/etc. it is dialing
>>>> a special number which connects as a data call. It makes a
>>>> difference. Possibly codec, then VAD and maybe even ECAN, right?
>>>>
>>>> -Quick
>>>>
>>>>
>>>
>>> High speed modems will not work with cellphones (computer modems and
>>> CC machines), but a fax is much much slower (interestingly enough
>>> usually 9600 or 14,400 baud, does not use packet switching, but a
>>> direct connect, same speed as QWK2NET provides making direct calls
>>> to an ISP) and does not use data call parameters, it is a direct
>>> connection. There are two main types of connections, circuit
>>> switched and packet switched. A low speed (FAX or QWK2NET call)
>>> uses circuit switched, while the higher speed uses packet-switched
>>> (which is incompatible). Ever wonder why you can use QWK2NET at
>>> lower speeds the same as fax?
>>
>> I agree the bandwidth is not an issue. I still suspect there is a
>> distinction
>> between voice and data connections. Either at the phone or the
>> network and probably both. For example your fax won't work if a
>> compression codec is used (well, most compression codecs). A data
>> call will require end-to-end bit exactness. A voice call does not
>> and most often isn't.
>>
>> So when you initiate a data call from your phone you (in effect)
>> dial a special number which lets the phone, and in turn, the network
>> know
>> it's a data call (either circuit or switched). This (and/or the
>> associated parameters) gets propagated all the way to the far end
>> terminating equipment.
>> Currently, providers are doing aggregation in the core network so
>> this
>> is relevant even after you get past the air interface.
>>
>> With POTS a fax machine will dial a number and the network will set
>> up a voice call bearer path.
>> The fax will then (usually) send a 1100hz CNG to identify itself as
>> a fax machine.
>> The terminating fax machine will send/respond with a 2100hz tone.
>> Since the CNG is sort of iffy lots of network equipment ignores the
>> CNG and only detects the 2100hz tone. It is the 2100hz tone that
>> definitely identifies the
>> call as a data call (either fax or modem). (for completeness) the
>> faxs will then
>> turn on the V.21 preamble which is used by the network to
>> distinguish a fax from a modem.
>> So the network will initially set up a voice call and then convert
>> it to a data
>> call (usually on detection of the 2100hz).
>>
>> With cell phones this is all done by dialing a magic phone number
>> (Q2Net or NA) or identifying the connection type as wireless modem.
>> This tells your phone it is a data call and not a voice call.
>>
>> With something like a cell socket wouldn't you lose this information
>> and the cell phone would simply dial a number as a voice call?
>>
>> -Quick
>>
>>
>
> Unfortunately your description above is way way wrong. There are
> actually TWO types of calls Circuit switched and packet switched, and
> what you describe above, while good for packet switched, doesn't even
> come close to being correct for circuit switched, which is what a fax
> data call (or qwk2net calling a 10 digit number instead of the "magic
> number") call will be.
>
> While you can always dial the "magic number" (usually #777), use the
> verizon network and have it packet switched, you can ALSO, and always
> have been, able to dial the actual 10 digit number and have it
> circuit switched! (works differently and at a MUCH slower speed,
> actually 14.4 but some people think it is 19.2 cuz that's the number
> that displays on the screen). Note dialing the 10 digit number
> totally skips the verizon (computer not phone) network.
Ok... (thinking aloud) When you make a voice call dialing through
the phone keypad, a new CDMA phone is likely to use EVRC for
the codec. EVRC is a variable rate *compression* codec that usually
runs at around 8K. Clearly not good for fax/modem. When you make
a normal voice call with your cell phone dialing a normal 10-digit number
where does it go? My assumption was that it was circuit switched?
If this is true how does the far end know whether to decode using EVRC
or not?
Is this where I'm confused?
Is it the case that since a cell socket type of thing plugs into the serial
port on a phone that *all* outgoing calls will be made as "data" calls?
-Quick
/www.telular.com a few years ago,
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