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'Modem ICs'
1997\09\25@115640 by Rob

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Hi,

I am trying to consolidate a design I have by eliminating an external
modem and replacing it with a Modem IC on the PCB.  I have used Cermetek
modem ICs and they are very easy to work with and very little support
circuitry is needed.  However they are costly (at least $100) for a 14400.
Does anyone here know of some Modem IC manufacturers or have used modem
ICs in their projects?  A recommendation of where to look or parts to
research would be great.  I tried a web search and found only one place
who had something but it required a lot of support circuitry.

Secondly, I have heard some mention of using a PIC as a modem.  If that is
true, how easy is this to implement?  Where could I find some code?

Thanks,

Rob

1997\09\25@124257 by John Griessen

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At 11:46 AM 9/25/97 -0400, you wrote:
>Hi,
>
>I am trying to consolidate a design I have by eliminating an external
>modem and replacing it with a Modem IC on the PCB.  I have used Cermetek
>modem ICs and they are very easy to work with and very little support
>circuitry is needed.  However they are costly (at least $100) for a 14400.
>Does anyone here know of some Modem IC manufacturers or have used modem
>ICs in their projects?  A recommendation of where to look or parts to
>research would be great.
Try Zilog in austin Texas.  You may find yourself programming a little in
Z80 since it comes along with the modem, but they aim at the same price
conscious engineers as PICs do.

Ask for Suresh Cheemalavagu their chief engineer for modem/controller ICs
at 512 707-7751, and tell them John Griessen sent you.

1997\09\25@124536 by WF AUTOMA‚̀O

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Rob wrote:
>
> Hi,
>
> I am trying to consolidate a design I have by eliminating an external
> modem and replacing it with a Modem IC on the PCB.  I have used Cermetek
> modem ICs and they are very easy to work with and very little support
> circuitry is needed.  However they are costly (at least $100) for a 14400.
> Does anyone here know of some Modem IC manufacturers or have used modem
> ICs in their projects?  A recommendation of where to look or parts to
> research would be great.  I tried a web search and found only one place
> who had something but it required a lot of support circuitry.
>
> Secondly, I have heard some mention of using a PIC as a modem.  If that is
> true, how easy is this to implement?  Where could I find some code?
>
> Thanks,
>
> Rob

Try http://www.temic.com

mIGUEL.

1997\09\25@144251 by Harrison Cooper

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one major reason the units are pricey is that it includes that FCC
certified interface with the phone lines.  Lots of just modem chips are
there, but to legally interfaced, it must be certified at least in the
states.

{Quote hidden}

1997\09\25@224507 by Roger L Stevens

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Rob is looking for Modem ICs

Check with XECOM
408-945-6640

They have several, some having transferable FCC Part 68 registration

Roger
-----------------------------------------
What is a JOWETT JUPITER ?
Are there really Jowett Nuts ?
rogerlstevensspamKILLspamjuno.com
-----------------------------------------

1997\09\26@003625 by tjaart

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Rob wrote:
>
> Hi,
>
> I am trying to consolidate a design I have by eliminating an external
> modem and replacing it with a Modem IC on the PCB.  I have used Cermetek
> modem ICs and they are very easy to work with and very little support
> circuitry is needed.  However they are costly (at least $100) for a 14400.
> Does anyone here know of some Modem IC manufacturers or have used modem
> ICs in their projects?  A recommendation of where to look or parts to
> research would be great.  I tried a web search and found only one place
> who had something but it required a lot of support circuitry.

Rockwell makes a range of modem IC's. Try  http://www.nb.rockwell.com/

>
> Secondly, I have heard some mention of using a PIC as a modem.  If that is
> true, how easy is this to implement?  Where could I find some code?

I've seen a California-designed house alarm with a built-in
modem/communicator. On closer inspection (opening the damn thing) it
turned out to be a 16MHz 16C74 doing to whole lot. Quite impressive.


--
Friendly Regards

Tjaart van der Walt
.....tjaartKILLspamspam.....wasp.co.za
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1997\09\26@112626 by Harold Hallikainen

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       I used the Cermetek CH1770 in a design about ten years ago.  It
was 1200 bps and had its own strange command codes.  If you've got room,
and the I/O pins, how about putting an 8 bit ISA socket on your board and
buy whatever internal modem board is available at the time.  These are
VERY inexpensive, and are FCC approved (you'll spend more money on an
approved DAA if you go with the modem chip approach).  As better modems
come out, you just plug them in!

Harold

1997\09\26@113030 by Rob

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I checked them out, and the Xecom look fine.  But the price for a 2400
baud modem is just unacceptable.  The Cermetek 2400 baud is also
high priced IMO, but is significantly cheaper than the Xecom.  The
Cermetek from a price standpoint is at least competitive with a external
modem, though the external modem has a power supply allready and I can
steal my 5 volts from there.  The best part of the modem IC is the ease of
putting everything on one PCB. Most likely I will deal with Cermetek and
make everything compact, which I wanted in the first place.

Thanks everyone for their help in finding me some modem module sources!

Rob

On Thu, 25 Sep 1997, Roger L Stevens wrote:

{Quote hidden}

1997\09\26@113630 by Rob

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That is an idea I have been toying with for a while, but I do not know
much about ISA architecture.  The data from a modem card would be in
parallel, so i would have to shift to serial domain for my device (I'm
assuming).  I may have the I/O on the C74A available, I would just have to
rewrite the communication routines if i accessed the data in Parallel.

Rob

On Fri, 26 Sep 1997, Harold Hallikainen wrote:

>         I used the Cermetek CH1770 in a design about ten years ago.  It
> was 1200 bps and had its own strange command codes.  If you've got room,
> and the I/O pins, how about putting an 8 bit ISA socket on your board and
> buy whatever internal modem board is available at the time.  These are
> VERY inexpensive, and are FCC approved (you'll spend more money on an
> approved DAA if you go with the modem chip approach).  As better modems
> come out, you just plug them in!
>
> Harold
>


'Modem ICs'
1998\08\12@134402 by Carlos Fiestas
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part 0 1675 bytes
<META content=text/html;charset=iso-8859-1 http-equiv=Content-Type>
<META content='"MSHTML 4.72.3007.2"' name=GENERATOR>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT color=#000000 size=2>Hi everybody</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>Where can I find some information about modem
chips?. </FONT></DIV>
<DIV><FONT color=#000000 size=2>I need to conect this one whit a PIC for data
transmission over the telephone line.</FONT></DIV>
<DIV><FONT color=#000000 size=2>Any suggestion?</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>Let me know, thanks!</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>Best Regards</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>Carlos Fiestas Salazar</FONT></DIV>
<DIV><FONT color=#000000 size=2>INICTEL Lima-Peru</FONT></DIV>
<DIV><FONT color=#000000 size=2>email: <A
href="cfiestasspamspam_OUTinictel.gob.pe">@spam@cfiestasKILLspamspaminictel.gob.pe</A> </FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV></BODY></HTML>

</x-html>

1998\08\12@135904 by WF AUTOMACAO

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Carlos Fiestas wrote:
>
> Hi everybody
>
> Where can I find some information about modem chips?.
> I need to conect this one whit a PIC for data transmission over the telephone
line.
{Quote hidden}

The best way, i think, is to use a External modem with HAYES protocol
(with the pic).
I have developted for 8051 and worked well! YOu must to send some HAYES
commands, as ATD, and wait for RING... CONNECT etc!

Miguel.

1998\08\12@145305 by Rob

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Try Cermetek...about $60 US for a 2400 baud, and it's FCC liscensed.

Though I would want to try getting an external modem unless space is a
constraint.

Rob

On Wed, 12 Aug 1998, Carlos Fiestas wrote:

> Hi everybody
>
> Where can I find some information about modem chips?.
> I need to conect this one whit a PIC for data transmission over the telephone
line.
{Quote hidden}

1998\08\12@160356 by Harold Hallikainen

picon face
On Wed, 12 Aug 1998 14:51:11 -0400 Rob <TakeThisOuTrobzsEraseMEspamspam_OUTHICOM.NET> writes:
>Try Cermetek...about $60 US for a 2400 baud, and it's FCC liscensed.
>
>Though I would want to try getting an external modem unless space is a
>constraint.
>
>Rob


       If there is a size consideration, and you have enough I/O lines
to go around, how about just using a PC internal modem card?  These are
VERY inexpensive, small, FCC (or whatever country you're in) approved,
and allow for easy upgrading of the product (just plug in another.

Harold



Harold Hallikainen
RemoveMEharoldspamTakeThisOuThallikainen.com
Hallikainen & Friends, Inc.
See the FCC Rules at http://hallikainen.com/FccRules and comments filed
in LPFM proceeding at http://hallikainen.com/lpfm



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1998\08\12@171058 by Carlos Fiestas

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Well,

About my first message
I want to design a small, low power consumption system for biomedical
parameters data acquisition,
then I want to send this data through the telephone line to a PC host for
monitoring.

I have some idea about it:

1. Acquire the data using serial A/D and store it in EEPROM serial memory
2. Send the data to a remote PC host through telephone line
3. PIC 16C84 controls all operations in the system.

Anybody could suggest me another option?
Another IC modem source?

Yours faithfully

Carlos Fiestas
INICTEL Lima-Peru
Email: cfiestasEraseMEspam.....inictel.gob.pe

-----Mensaje original-----
De: Harold Hallikainen <EraseMEharoldhallikainenspamJUNO.COM>
Para: RemoveMEPICLISTEraseMEspamEraseMEMITVMA.MIT.EDU <RemoveMEPICLISTspam_OUTspamKILLspamMITVMA.MIT.EDU>
Fecha: Miircoles, 12 de Agosto de 1998 04:05 p.m.
Asunto: Re: Modem ICs


{Quote hidden}

1998\08\12@191804 by Felix Centeno

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part 0 2853 bytes
<P>Felix Centeno
<BR>RemoveMEcentellaKILLspamspamtelcel.net.ve

<P>Carlos Fiestas wrote:
<BLOCKQUOTE TYPE=CITE>Well,

<P>About my first message
<BR>I want to design a small, low power consumption system for biomedical
<BR>parameters data acquisition,
<BR>then I want to send this data through the telephone line to a PC host
for
<BR>monitoring.

<P>I have some idea about it:

<P>1. Acquire the data using serial A/D and store it in EEPROM serial memory
<BR>2. Send the data to a remote PC host through telephone line
<BR>3. PIC 16C84 controls all operations in the system.

<P>Anybody could suggest me another option?
<BR>Another IC modem source?

<P>Yours faithfully

<P>Carlos Fiestas
<BR>INICTEL Lima-Peru
<BR>Email: cfiestasSTOPspamspamspam_OUTinictel.gob.pe

<P>-----Mensaje original-----
<BR>De: Harold Hallikainen &lt;spamBeGoneharoldhallikainenSTOPspamspamEraseMEJUNO.COM>
<BR>Para: KILLspamPICLISTspamBeGonespamMITVMA.MIT.EDU &lt;EraseMEPICLISTspamEraseMEMITVMA.MIT.EDU>
<BR>Fecha: Miircoles, 12 de Agosto de 1998 04:05 p.m.
<BR>Asunto: Re: Modem ICs

<P>>On Wed, 12 Aug 1998 14:51:11 -0400 Rob &lt;@spam@robzs@spam@spamspam_OUTHICOM.NET> writes:
<BR>>>Try Cermetek...about $60 US for a 2400 baud, and it's FCC liscensed.
<BR>>>
<BR>>>Though I would want to try getting an external modem unless space
is a
<BR>>>constraint.
<BR>>>
<BR>>>Rob
<BR>>
<BR>>
<BR>>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; If there is a size consideration
,
and you have enough I/O lines
<BR>>to go around, how about just using a PC internal modem card?&nbsp;
These are
<BR>>VERY inexpensive, small, FCC (or whatever country you're in) approved,
<BR>>and allow for easy upgrading of the product (just plug in another.
<BR>>
<BR>>Harold
<BR>>
<BR>>
<BR>>
<BR>>Harold Hallikainen
<BR>>spamBeGoneharoldspamKILLspamhallikainen.com
<BR>>Hallikainen &amp; Friends, Inc.
<BR>>See the FCC Rules at <A HREF="http://hallikainen.com/FccRules">halli
kainen.com/FccRules</A>
and comments filed
<BR>>in LPFM proceeding at <A HREF="http://hallikainen.com/lpfm">http://hallikai
nen.com/lpfm</A>
<BR>>
<BR>>
<BR>>
<BR>>_____________________________________________________________________
<BR>>You don't need to buy Internet access to use free Internet e-mail.
<BR>>Get completely free e-mail from Juno at <A HREF="http://www.juno.com">http:
//http://www.juno.com</A>
<BR>>Or call Juno at (800) 654-JUNO [654-5866]</BLOCKQUOTE>
&nbsp;</HTML>

</x-html>

1998\08\13@140755 by Claudio Rachiele IW0DZG

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                  Status Distribution August 12, 1998 17:39:43

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1998\08\13@173718 by Claudio Rachiele IW0DZG

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1998\08\13@183719 by Dale Sponseller

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