Current manufacturers of up-to-date modem chips:
Makers of slow modems:
List of modem chips
Date: 19961008
From: Bruce Cannon
To: pics@parallaxinc.com
Subject: Re: [PICS] Modem
I have an application for using PIC16C84 and some serial EEproms in
a remote data logger. I have been using an old 2400 baud* external
modem but now need to build in quanity and am looking for a 1200
or 2400 modem on a chip or few chips.
Does anyone have any experience with or knowledge of single chip modems?
Xecom and Cermetek both make totally self-contained single-chip modems for
about $60 qty 1. I've used xecom's, but am thinking of switching to
Cermetek; seems to be more well documented, and are cheaper and smaller.
Both support a simple two-wire interface (TX and RX) to the micro*. NO
additional components are required.
Date: 19961016
From: Pekka Ritamaki
To: pics@parallaxinc.com
Subject: Re: [PICS] Modem Cermetek CH1786
I have an application for using PIC16C84 and some serial EEproms in
a remote data logger. I have been using an old 2400 baud* external
modem but now need to build in quanity and am looking for a 1200
or 2400 modem on a chip or few chips.
Xecom and Cermetek both make totally self-contained single-chip modems for
I just finished product development with Cermetek CH1786 2400 modem module
24 DIP. It connects directly to phone line and 8051 TX,RX pin ( or PIC). It
needs 5V DC power and modem control bit DTR. I use also Ring Indicator bit.
It works normally with AT-commands.
Basicly it works.
Pekka Ritamaki PROBYTE Oy Nirvankatu 31
FIN-33820 TAMPERE Finland www.sci.fi/~pri
Electronics product design: hardware+software+development tools
puh INT +358-31-2661885 fax INT +358-31-2661886
Date: 16 Oct 96
From: alan.ballweg@alias.fdn.fr (ALAN BALLWEG)
Organization: Association Informatique & Reseaux - Alias BBS France
To: PICS@parallaxinc.com
Subject: Re: [PICS] Re: Looking for so
Does any one have the experience of integrating RF Transmitter/or
receiver with the PIC ?
Where to get the ready made RF Transmitter and Rcver ( Short range
about 10 meters which can send digital data ).
LEE ( Malaysia)
I've used the MIPOT modules (AUREL is a similar product) which are
available in Europe, from the USA Holtek and Ming come to mind
(available from Digikey 1-800-DIGIKEY). They are small modules, very
easy to use, digital goes into one pin, is transmitted, received, and
the digital comes out another pin. The AM* modules transmit at up to 2400
baud*, the FM* modules up to 9600 baud*. About 100meter range. I don't know
what's available in Malaysia. I've had good experience with the MIPOT
and AUREL modules, in tough real-world field conditions. I've heard that
the Holtek modules can be 'tweaked' to give up to 5 miles range but I
don't know the details.
Rockwell presented their position in the telecommunications
IC* market and showed off a little about the 56K "modem"
technology (but I found most of that info beforehand on
plainfield.bypass.com/~gzaret/hiband.56k.html, especially
follow the link "56 Kbps Communications Across the PSTN", which
points to a white paper from Rockwell).
Ernst Ahlers
TI DSP Chipset Backs USR High-Speed Modems
HOUSTON, TEXAS (October 16, 1996) -- Texas Instruments
(TI), the industry leader in digital signal processing
(DSP) solutions, announced the immediate availability of
modem chipsets compliant with 56 kilobits-per-second
(kbps) "x2" technology from US Robotics Corp. (USR,
Chicago, Illinois). TI's chipset platform for the new 56
kbps modems gives modem makers a distinct competitive
advantage by providing a proven chipset that is currently
in full production, and facilitates a flexible software
modem solution based on a software programmable digital
signal processor (DSP) chip.
www.ti.com/ - Full text
