Try suggesting to BT that their copper sucks!
Jonathan k. Creasy wrote:
I think he's talking about putting protection from the PSTN lines not
the incoming power.
-Jonathan
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Mark
Phillips
Sent: Thursday, August 25, 2005 11:32 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Sipura spa-2000 / 3000: surge protection
You would? Why not just put then on a small UPS and have done with it?
The UK has some of the cleanest electricity in the world.
Unlike the US (what a big shock that was, moving here) where brown-outs
and over volts are common I've never needed to add protection devices to
the UK supply.
Mark
Peter Hoppe wrote:
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
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Mark, G7LTT/KC2ENI
Randolph, NJ
http://www.g7ltt.com
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