Hello ..
Dhirendra Pal Singh
I saw this group couple of days and couldn't believe what you folks are trying to do.. hell I always wanted to do this.. so I am very glad to be here..
Now I don't have any hardware background but will pick up what ever need.. so is there any doc or something I can start browsing through in my spare time.
Also would like to know how can I help.. please let me know if I can be of assistance in anyway..
--
Thanks
Dp
[The force is feminine in nature]
David Rowe
> Now I don't have any hardware background but will pick up what ever
> need.. so is there any doc or something I can start browsing through
> in my spare time.
A good place to start would be to learn a little about the sort of
microcontrollers we intend to use, for example PIC or Atmel ATMEGA.
Some devices are mentioned on previous posts. You could read about
them, or obtain a development board and/or samples.
> Also would like to know how can I help.. please let me know if I can
> be of assistance in anyway..
There are several areas that need some development for example:
1/ Audio I/O and handset interface
2/ DC-DC converter to generate ring and battery voltages.
3/ Asterisk channel driver
4/ Interface between microcontroller and router (e.g. RS232, Ethernet,
USB).
Feel free to work on any of these. I am working at a low level on (2)
using an ATmega development system.
Cheers,
David
>
> --
> Thanks
> Dp
> [The force is feminine in nature]
> >
--
Free Telephony Project
open embedded IP-PBX hardware and software
http://www.rowetel.com/ucasterisk
trave...@gmail.com
On Aug 29, 12:15 am, David Rowe <da...@rowetel.com> wrote:
> A good place to start would be to learn a little about the sort of
> microcontrollers we intend to use, for example PIC or Atmel ATMEGA.
> Some devices are mentioned on previous posts. You could read about
> them, or obtain a development board and/or samples.
Has ayone looked inside the wi-fi routers/APs with built-in ATAs? The
cost differential between those with ATAs and those without seems
pretty small. Are the products integrated or are the FXS electronics a
daughter board or something? I live in a small town so I can't get one
locally to pop apart.
--john
Andrew Nording
Every ATA, that i know to date is built around:
1) SLIC and CODEC chips (most recent designs have those as one chip, namely Silabs' Si3210)
2) CPU
3) DSP (recent designs tent do have DSP inside CPU - either as hardware or even as software)
4) RAM/Flash/etc.
Integrated boxes have CPU and RAM/Flash already, so only CODEC/SLIC is needed - hence low price difference. I a stand-alone ATA all this is not very helpfull, because - first: stand-alone SLIC/CODEC will not work by itself, and second: typical SLIC/CODEC chip with appropriate passives cost $10-$25.
Dhirendra Pal Singh
Thanks for the reply and tips...
Here is what I am going to do as I am a total newbea..
A) read lots about micro controller
B) get a pic micro controller, bread board, converter chip (ttl to rs232).
C) get it to work.
A friend here at work suggested the above.
Meanwhile, I was also thinking, in future, it would be a good idea if we can connect via 802.11 b/g/n I know that will raise the cost, but I think it would be a good idea to have it. Or may be have it as a module, which can be added as needed..
Anyway that is too far for me as of now..
Thanks and looking forward to make this happen..
Dp
Hi Dp,
> Now I don't have any hardware background but will pick up what ever
> need.. so is there any doc or something I can start browsing through
> in my spare time.
A good place to start would be to learn a little about the sort of
microcontrollers we intend to use, for example PIC or Atmel ATMEGA.
Some devices are mentioned on previous posts. You could read about
them, or obtain a development board and/or samples.
> Also would like to know how can I help.. please let me know if I can
> be of assistance in anyway..
There are several areas that need some development for example:
1/ Audio I/O and handset interface
2/ DC-DC converter to generate ring and battery voltages.
3/ Asterisk channel driver
4/ Interface between microcontroller and router ( e.g. RS232, Ethernet,
David Rowe
I haven't had a look inside any however I imagine that they have one of
the standard DSP chipset for the VOIP side plus something like a Silicon
Labs 3210 chipset for the FXS interface. It is also possible to do the
VOIP/DSP work on the host processor if it's just one or two channels.
- David
Felipe Uderman
Let's see if I can post here now, I was having problems before..
Ok, I also want to help this project happen! I have some experience with microcontrollers, but not much. I am having problems to find a local suplier for an atmega16 development board. I would like to buy one to start testing it and be able to help the project. But importing one can be expencive, as the importation taxes here in Brazil are 60% of the total value of what you are buying. Anyway, I can see that you guys are more inclined at using an Atmega16 controller, but have you guys allready decided? It seens to me that it is a good solution, as it is a very cheap chip.
Regards,
Felipe
David Rowe
> Let's see if I can post here now, I was having problems before..
Coming thru loud and clear :-)
> Ok, I also want to help this project happen! I have some experience
> with microcontrollers, but not much. I am having problems to find a
> local suplier for an atmega16 development board. I would like to buy
> one to start testing it and be able to help the project.
You know you could probably just a buy a ATMega16 chip and wire up a
board yourself. I think all they need is a few parts to get them
started. My download cable is just a few wires from a parallel port,
and all the Linux tools I use are free.
BTW you can get PICs for free (see earlier posts on this group), mine
arrived in about 4 weeks to where I live in Australia.
> But importing one can be expencive, as the importation taxes here in
> Brazil are 60% of the total value of what you are buying. Anyway, I
> can see that you guys are more inclined at using an Atmega16
> controller, but have you guys allready decided? It seens to me that it
> is a good solution, as it is a very cheap chip.
I just chose the Atmega16 as Kiko built a similar project around this
family, and I could get a dev system easily. I also have some USB PICs
that I will try out some day. I am more interested in trying out
algorithms right now that finalising a chip selection. Once we get some
working algorithms porting between chips wont be too hard.
Thanks,
David
Dhirendra Pal Singh
I am trying to read more about PIC.. :(
If the future is with Atmega16, then Atmega16 it is..
Thanks
Dp