AVR-Chat

Kathy Quinlan wrote:
>>Kat, are any of these designs in the public domain?
> 
> Nope, all the designs are behind NDA's due to the cost of the permits 
> for them :(

I understand

> But I can advise on design issues to maximise safety etc, I would not 
> worry about running on batteries, they will not last long (unless you 
> are talking a big battery) It is very easy to design for safety, just 
> make sure you use lots of isolation transformers and relays etc.

I understand. I wanted to make sure that people didn't get the wrong idea 
about the safety aspect of this kind of work - not safety for the user, but 
the telecoms service provider.

> I can provide some schematic snipets of line and phone interface 
> circuits, and if you are in WA I can probably give you some SLIC's etc 

OK, simple (?) question then ... if I have two lines in, and 8 phones, and I 
want any phone to connect to any line, then what's the cheapest and/or easiest 
way to have a cross-point switch to do that? I'm assuming that somewhere 
there's an AVR that may have to do some tone decoding (or interface to a tone 
decoder) to perform the transfer function from one phone to another phone.

> from NEC as I have a fair few (ummm well most of the Spares in WA for 
> the D3 series)

I'm in the ACT and I use TransACT, a service provider who uses fibre to within 
300 m of all endpoints. They also provide high speed packet switching and a 
"cable TV" service, all on the one fibre.

Peter Gargano