Hmm.. you are sending to Saudi equipment for remote control of electrical
devices ...

Can you design them NOT to work with the American phone system ?  ;-)

Tal

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of nouman
> Sent: Sunday, June 09, 2002 6:32 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]: Any one knows the ringing shape on Saudi
>
>
> Hi all
> Since two years I build a small system RCT-02 that used to control
> electrical devices remotely via phone line
>
> it is a simple system and one of the important thing is to detect the ring
> signal
> I connect the phone line directly to the PIC with big resister protection
> So the shape of ring in my country is like this  (Freq 20Hz)
>
>
> 5 V             _______            _______
>              ___|          |_______|           |_____
> 0 V                   a          b
>
> a = b = 25 ms
>
> and if there is a caller Id data it looks like this
>
> 5V              _______            _______
>             ___|          |___/\___|           |_____
> 0 V                             C
>
>  C = 8 ms Id data
>
>
> But last month I have send some devices to Saudi and it did not
> work because
> these devices did not detect the ringing  .......
> any one knows what it might be the shape of ring signal in Saudia ......?
>
>
> Thanks in advance
>
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