[c-nsp] Surge protection on leased lines

[Jay Hennigan]

Brian Turnbow wrote:
> Hello,
>  
> We have several customers that our having problems every time a storm
> goes through. 
> Our national telco company seems to offer no lightning protection on
> their lines, and every storm causes a line outage and burns up the
> attached wic.
> We've made sure the chassis are grounded , but would also like to try
> and install a surge protection detween the v.35 interface of the telco
> and our CPEs.
> I see that Cisco offers a surge protection cable for smart serial
> interfaces, but not for classic serial interfaces. 
> I wanted ask what others would recommend / experiences regarding surge
> protection on leased lines.

This is an external CSU?

I think you want it between the telco smartjack and the CSU, not on the 
v.35.  This should be two pairs of wires.

First thing to do is ensure that the telco smartjack, the CSU, and the 
router are solidly connected to a common ground, as this may be the 
source of the problem if the sneak current is not coming across the 
leased line.

There are a number of companies making lightning protectors for twisted 
pair lines, Reliable Electric and Polyphaser are two.

But, triple-check the grounding first because if it's common-mode across 
a ground differential the protectors won't help.

--
Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
Impulse Internet Service  -  http://www.impulse.net/
Your local telephone and internet company - 805 884-6323 - WB6RDV