Line/trunk surge suppression 1

[verland]

I'm trying to protect my Legend from surges over the phone line. Many setups I've seen don't really concern themselves with it but my location has smoked modems through the phone lines before so it's a bit of a worry.



I was hoping to use an APC PNET-4. It's designed for cat-5 stuff but I put a cable scanner on it and verified that all 8 positions go through clean. However, plugging a loopstart line into it causes a short somehow, so the line never answers!



I also tried another APC product designed for analog phone lines (forgot the model). This worked for a while, but recently quit working. I replaced it with an identical unit and it still didn't work. The line was recently swapped from loop to ground start, but it's still a mystery I'm working on.



So right now my system has no protection. Anyone have a cool setup they'd share? Thanks all.

 

[Phoneguy15]

Verland,
Panamax makes a surge suppression system specifically for Avaya systems.
They are modular connection types, so you can just plug in a line cord from where your lines come in and then plug another line cord to the trunk port on the system. They make surge suppression designed for A/C current, OPX stations(IROB) and CO line level protection.

The reason you were shorting the APC protector was because the clamping voltage for the protector is probably around 7 volts or so. Talk battery on a loopstart line sitting idle is about 48 volts. Ringing current on a loopstart line is around 95 to 120 volts depending on the provider, distance from the CO, etc...
So, just plugging in your loopstart line was exceeding the clamping level of the surge suppression you were using.
Usually the clamping level on the CO surge protection is around 130 volts.

 

[verland]

Wow, that would answer that. Thanks much!