[Asterisk-Users] Sipura spa-2000 / 3000: surge protection

[Peter Hoppe]

I am located in the UK, and I am using Sipura spa-2000 adapters to 
connect analog phones to a voip network. The network connects to the 
PSTN as well via the Sipura spa-3000 adapter.

I would like to provide surge protection for the spa-2000 and the 
spa-3000 adapters.

1.	For spa-2000, fxs port: What is the maximum tip-to-ring voltage 
before damage to the the adapter occurs?

2.	For spa-2000, fxs port: What is the maximum voltage between both legs 
and ground before damage to the the adapter occurs? (I have looked 
inside an spa-2000 adapter and saw that the board has a ground plane 
integrated; the four screw holes seem to connect to that ground plane)

3.	For spa-2000, network port: Would I need any surge suppression? What 
would be a good way forward? I suspect all I need would be some clamping 
device on the TX/RX pairs that restricts the voltage?

4.	For spa-3000, fxo port: Again, maximum tip-to-ring voltage before damage.

5.	For spa-3000, fxo port: Maximum voltage between both legs and ground.

Thank you very much for your consideration!


Peter Hoppe