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Groups > comp.sys.laptops > #317
| From | Paul <nospam@needed.com> |
|---|---|
| Newsgroups | comp.sys.laptops, microsoft.public.windowsxp.general, alt.os.linux.ubuntu |
| Subject | Re: how to connect PC Card Modem to laptop - please help |
| Date | 2011-06-21 23:05 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <itrm6l$9v3$1@dont-email.me> (permalink) |
| References | <ir71jb$3ma$1@dont-email.me> <ir746m$gq2$1@dont-email.me> <ir7547$l4l$1@dont-email.me> <itr9ig$8ki$1@dont-email.me> |
Cross-posted to 3 groups.
Adam wrote:
> "Adam" <adam@no_thanks.com> wrote in message news:ir7547$l4l$1@dont-email.me...
>> "ED" <xxagon@hotmail.com> wrote in message news:ir746m$gq2$1@dont-email.me...
>>> "Adam" <adam@no_thanks.com> wrote in message
>>> news:ir71jb$3ma$1@dont-email.me...
>>>> Operating System: Windows XP
>>>> PC Card Modem: Psion Gold Card Global 56k + Fax
>>>>
>>>> My old laptop had a couple of PC Card slots,
>>>> one of which was used for a PC Card Modem.
>>>> Now, I am interested in connecting this PC Card Modem to
>>>> my new Windows XP laptop, which does not have PC Card slots.
>>>> So, I am looking for a good PC Card Reader. Any suggestions?
>>>> Or, is there a better approach?
>>>>
>>> One of the following should suit your purpose:
>>>
> http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH
>> &Description=usb+modem+56k
>> Thanks!!
>>
>> Unless I hear otherwise, I guess I'll try the following ...
>> Rosewill RNX-56USB Conexant Hardware Based 56Kbps USB (Plug & Play) V.92
>> Data/Fax/TAM Modem
>>
>
> It looks like I may need a PCMCIA USB adapter after all in order to
> salvage my PC Card Fax Modem (which works with DSL) after all.
> The problem is that many fax modems will not work with DSL.
> And, Rosewill Tech Support just confirmed this.
>
> Anyone with DSL using a 56k fax modem to send fax? If so,
> what's the make/model of your 56k fax modem?
[Note - copy and paste the below into Notepad or equivalent,
and use Courier font, if you want to view the diagrams as I
drew them.]
I think before running off to the store, I'd slow down a bit first.
There are many kinds of phone lines, but some are obscure enough
we don't have to worry about them.
Two common situations now, involve "ordinary POTS" versus VOIP.
The definition of POTS is here - it's the old copper phone
line we had in the 50's, with 4KHz or lower bandwidth.
http://en.wikipedia.org/wiki/Plain_old_telephone_service
Some telephone companies are eliminating POTS service, in favor of
VOIP solutions. There might not even be a customer premise piece
of equipment doing the VOIP, so the difference might not even be
apparent to the home owner.
We can take my house as an example. I still have POTS, plus they
added ADSL to the line. I don't own a FAX machine, but if I did,
it would work. I can add at least four filters and taps to the
line if I want (I own four filters). Only one analog phone can
go off-hook at a time, so there is only "one line".
28KHz-1MHz DSL RJ45
Telco --------------------+---------------+----- ADSL modem ------------ Computer
4KHz baseband | | ethernet
Filter Filter
4KHz or lower 4KHz or lower
| |
analog phone analog FAX
RJ11 connector RJ11 connector
In the previous diagram, I would be running a traditional, clunky,
standalone FAX machine. No computer involvement in the faxing process
in that example.
Now, if I wanted, I could use a FAX modem on the computer, like this.
28KHz-1MHz DSL RJ45
Telco --------------------+---------------+----- ADSL modem ------------ Computer
4KHz baseband | | ethernet |
Filter Filter USB FAX
4KHz or lower 4KHz or lower Modem
| | |
analog phone +---------------------------------+
RJ11 connector RJ11 connector
The previous diagram also works, because of the regular, reliable 4KHz
passband.
When the telephone company stops supporting POTS, they use VOIP or
voice over internet protocol. That can involve the ADSL modem. So
only the modem "sees" the phone line, like this. Now, there is
no 4KHz analog content at all. Just the modulation above 28KHz for
ADSL. The ADSL sees the full spectrum, just as before, because there
is no filter in front of the ADSL modem.
28KHz-1MHz DSL RJ45
Telco --------------------+---------------+----- ADSL modem ------------ Computer
ethernet
To make it more transparent as to what is happening, now I add VOIP to the picture,
and also include a router for more computers. VOIP is "downstream" of the
modem, and "upstream" of the router. The reason the first implementations
sat upstream of the router, was to make it easier to access all the port
numbers used by VOIP protocols (control path and data path). So this diagram,
compresses that useless wire in the middle of the picture, to make more
room for the other junk.
28KHz-1MHz DSL RJ45 RJ45 RJ45
Telco ------------------ ADSL modem ---- VOIP 2 Port Box ---- Router ----- Computer
| RJ11 | RJ11 ----- Computer
| |
(4KHz) (4KHz)
analog analog
phone FAX
Now, again, I can replace that clunky, separate "analog FAX" machine, with
a FAX modem on the computer. I'll run a line from the second computer,
which has a USB FAX or PCMCIA FAX device plugged into it.
28KHz-1MHz DSL RJ45
Telco ------------------ ADSL modem ---- VOIP 2 Port Box ---- Router ----- Computer
| RJ11 | RJ11 ----- Computer
| | |
(4KHz) (4KHz) USB FAX
analog | Modem
phone | |
+----------------------------+
RJ11 connector
Now, what you're attempting to do, is run "FAX over VOIP". This is not the same
as running "FAX over 4KHz baseband", as in the first diagram.
And that's what you need to research. What impairment does using VOIP
to *emulate* an analog phone service cause ? You need to be absolutely
certain, you know how your telephone company (or you yourself) have
arranged to make that "phone line" you're using. VOIP is a lot different
than an old POTS copper line.
So it's not really an argument about how sweet a particular
brand of FAX modem happens to be. It's an argument about
whether the phone line is "plain" or "VOIP" type.
In some households, the "VOIP box" is in the pedestal or outside
the house, and the home owner may not even be aware they're on
VOIP. Depending on when you did your setup (like some of
my samples above), you as the home owner may already be
aware you're using VOIP, because you actually own a VOIP
box sitting in the room with you.
Try search terms, such as "FAX over VOIP". One web page,
tries to sell you a different IP protocol to send faxes
(presumably, with a monthly bill). This web page, talks
of dropping the FAX transmission rate, to make it work.
The success or failure, might even depend on delay jitter
in the VOIP service. Who knows...
(site uses a lot of popup crap...)
http://askbobrankin.com/fax_over_voip.html
"The best tip I can offer is to reduce your fax transmission speed to
9600 bps to maximize VoIP fax success rates. The faster one tries to
send a fax, the more likely it is to fail on a VoIP connection."
Now, back to the discussion about which FAX modem is superior
to which other FAX modem :-)
Have fun,
Paul
Back to comp.sys.laptops | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
how to connect PC Card Modem to laptop - please help "Adam" <adam@no_thanks.com> - 2011-05-20 17:37 -0700
Re: how to connect PC Card Modem to laptop - please help "ED" <xxagon@hotmail.com> - 2011-05-20 21:23 -0400
Re: how to connect PC Card Modem to laptop - please help "Adam" <adam@no_thanks.com> - 2011-05-20 18:39 -0700
Re: how to connect PC Card Modem to laptop - please help Bob Villa <pheeh.zero@gmail.com> - 2011-05-21 05:18 -0700
Re: how to connect PC Card Modem to laptop - please help "Adam" <adam@no_thanks.com> - 2011-06-21 16:30 -0700
Re: how to connect PC Card Modem to laptop - please help "Adam" <adam@no_thanks.com> - 2011-06-21 16:33 -0700
Re: how to connect PC Card Modem to laptop - please help "Adam" <adam@no_thanks.com> - 2011-06-21 17:20 -0700
Re: how to connect PC Card Modem to laptop - please help richgr@panix.com (Rich Greenberg) - 2011-06-22 00:23 +0000
Re: how to connect PC Card Modem to laptop - please help richgr@panix.com (Rich Greenberg) - 2011-06-22 00:37 +0000
Re: how to connect PC Card Modem to laptop - please help Paul <nospam@needed.com> - 2011-06-21 23:05 -0400
Re: how to connect PC Card Modem to laptop - please help "Adam" <adam@no_thanks.com> - 2011-06-22 14:58 -0700
Re: how to connect PC Card Modem to laptop - please help "Adam" <adam@no_thanks.com> - 2011-06-22 18:40 -0700
Re: how to connect PC Card Modem to laptop - please help "BillW50" <BillW50@aol.kom> - 2011-06-25 04:41 -0500
Re: how to connect PC Card Modem to laptop - please help Roger Mills <watt.tyler@gmail.com> - 2011-06-22 09:54 +0100
Re: how to connect PC Card Modem to laptop - please help BillW50 <BillW50@aol.kom> - 2011-06-22 15:32 -0500
Re: how to connect PC Card Modem to laptop - please help "Adam" <adam@no_thanks.com> - 2011-06-22 14:48 -0700
Re: how to connect PC Card Modem to laptop - please help Roger Mills <watt.tyler@gmail.com> - 2011-06-22 22:54 +0100
Re: how to connect PC Card Modem to laptop - please help "Adam" <adam@no_thanks.com> - 2011-06-22 15:02 -0700
Re: how to connect PC Card Modem to laptop - please help Andy <nospam@> - 2011-06-22 19:06 +1000
Re: how to connect PC Card Modem to laptop - please help wrat@panix.com (the wharf rat) - 2011-06-22 18:39 +0000
Re: how to connect PC Card Modem to laptop - please help Dominique <me@domain.net> - 2011-06-23 21:55 +0000
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