house alarm systems and the fixed phone line

[sick_man]

hahahahah

the solution is staring me in the face
up convert the dtmf to 6khz
simply add a 1khz modulation tone am using a small audio mixer to the transmited signal
then on the other end filter it out to leave the data
using a pll locked to the removed 1khz tone {this should deviate at 1hz}
adding a further referance tone will give a higher order correction factor so the bandwidth can be increased
this way defeating the silence periods

problem solved

 

[jss]

Hi Monkey,

I assume you are proposing modifying all the existing alarm receivers in all Alarm Monitoring Central Stations around the world.

hahahaha, it's that easy!

Regards
jss

 

[sick_man]

i think the modification of them

has never been done

and it is not a case of modifying anything
just adding a small additional circuit to the unit
when adding gsm connections

you miss the point of the original thread

 

[mk3]

There are then some DTMF codes like ContactID (Ademco) or Scantronic Fast and some FSK like Silent Knight or SIA.
Spending some extra time I could find some more information if you really need it .

I really need some more info on home/fire alarm system transmission protocol, like the ones you had talked about so much time ago

Can anyone help me? :roll:

 

[ozgood]

There's a comercial product available that might help you out. It's available in both CDMA/GSM standards. Their website is www.ipscellular.com.

 

[jburbano]

Alarm protocols

Still hunting for the alarm protocols. Did anyone ever find a good source for the protocol details? ContactID, SIE, etc?

 

[artem]

For GSM implementation it is better to not use speech as transcoders will corrupt spectrum of your signal . But you have to make signal conversion on both ends .
Your GSM must send signals using CS data services (modem) . On receiving end you have to put sginal converter - modem <->CID . Combination of mcu + standard modem will suffice .
Thus you do not have to change the world - but only part of it .

 

[jburbano]

Thanks for the info. I will not be using GSM however. I am looking for something that will interpret alarm codes directly off the alarm panel. I am building a PSTN emulator that will decode and acknowledge the the alarm panel locally. What I am looking for is gory detail on the alarm communication protocols themselves (ContactID, SIE, etc.). Any details on the PSTN emulator would also be helpful but useless w/o the protocol details.

Thanks!

 

[najam696]

check out epanorama.net

discovercircuits.com