Hi,
Recently I was searching for a GSM Gateway to use in my house in order to make and receive GSM calls
from my landline. First think I did is to look at ebay for one and I found some Chinese custom jobs for
30 euros shipped. When I searched further I found out that these are made from some stripped Nokia
mobiles phones interfaced with a micro in a custom case. I said ok, now I need to search more... :-)
It seems that there are not many of them out there. One thing I did not know is that they are called Premicells.
Luckily I found a great deal for the Vierling ECOTEL GSM3-110A for a silly price... These were sold for quite
a steep price and they are still sold for about 250 euros and more. The main reason I bought it is to be
able to use my mobile line around the house and more importantly to be able to talk without worrying for
the now proven harmful radiation.
Never heard of the company, but it looks like they are specialized in communication equipment.
Maybe its well known in Germany.
So, here is a brief look for those interested.
(you can click on the images for full resolution)
What came in the package:
![](http://s5.postimg.org/ohxm50nhj/GSM_Gateway.jpg)
First thing you notice is how lightweight the whole thing is. It feels very cheap and the plastics are indeed
cheap. The case is held together with some clips on the sides which are very easy to open.
But when you open it you will see that it is basically empty space. Its a single board mounted on the bottom.
The whole thing could have been 3 times thinner...
![](http://s5.postimg.org/jxg13tt5z/Mainboard_Overview.jpg)
Some input protection. Fuse for the DC In and some MOVs for the phone lines.
I thought that it was better to use GDTs for telecom applications (?)
![](http://s5.postimg.org/6dz6y4f6v/Input_Protection.jpg)
The GSM external antenna jack:
![](http://s5.postimg.org/jthm9tyav/GSM_Antenna_Connector.jpg)
and the RF on board module:
![](http://s5.postimg.org/klovmrrvr/RF_Module.jpg)
..no idea what this is. Its another little board on top of the mainboard which is soldered directly.
![](http://s5.postimg.org/b9y8c2pyf/Mystery_Board.jpg)
Some SMD Siemens relays. You can hear them clicking when the units boot up.
![](http://s5.postimg.org/y8uxuzlyf/SMD_Relay_Array.jpg)
A XILINX CPLD gate maze:
![](http://s5.postimg.org/uqixyll2f/XILINX_CPLD.jpg)
The usual suspect:
![](http://s5.postimg.org/hwkw597mv/ATMEL_8_Bit_Micro.jpg)
and some flash memory:
![](http://s5.postimg.org/y6b285iav/Winbond_Flash_Memory.jpg)
The power adaptor, again made with cheap plastics (slightly better) :
![](http://s5.postimg.org/ijjsus4iv/Power_Adaptor.jpg)
The interesting thing is that the modular AC jack clips on the actual PCB of the power
adapter. Not sure if this is a good idea though. I could not open it to see whats inside.
It looks like its ultrasonically sealed and I don't want to destroy it since it already seems
fragile enough.
![](http://s5.postimg.org/cu3kagycn/Modular_Jack.jpg)
Finally these are the front panel LED indicators:
![](http://s5.postimg.org/q723zcdt3/LED_Indicators.jpg)
and the rear panel connector terminals:
![](http://s5.postimg.org/f8vfuwelj/Rear_Panel.jpg)
Not sure what the FXS I/O port is yet. In the manual its printed as the FXS Fax port. Maybe its the same.
The SIM card slot is thicker than needed and you can easily drop the SIM card inside the case...
It comes with a software that you need to install in order to set it up via its serial interface.
No problems with the software. Works fine and has a ton of options.
![](http://s5.postimg.org/c5zb59p0n/Software.jpg)
Very versatile hook up options as well:
![](http://s5.postimg.org/jzzwqnwtj/Hook_Up_Examples.jpg)
Despite the fact that it is enclosed in very cheap plastic cases which does not instill any confidence at all,
it is a very well engineered unit that works fine. At least better than the hacked Nokia phone...
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/xsmiley.gif.pagespeed.ic.R8GFI-pF6f.png)
Recommended.
![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif.pagespeed.ce._JElyJQqdB.gif)