[asterisk-users] Sipura 3000 replacement ---> SPA3102 how reliable is it?

[Andrew Latham]

It sounds to me like you have a improperly bonded ground.  This is
common in larger industrial build outs.  I have seen this many times.

Verify that the Demarc is only grounded to its rod and the house is
grounded to another rod.  Measure the energy from ground rod to each
other and to the water supply to see if the is a water ground in the
home.  Most electricians do a good job and mean well but lack the
knowledge of what some of this equipment is doing (FXS ATA for
example).  A UPS is only good for stopping brownouts which can ruin or
worse physically harm CMOS chips (think hard disk controller drawing
power from the case in small arcs...).  And as I have found don't
assume you know what is happening, I have discovered a lot by
following the wrong trail toward fixing items...



On Sat, Jul 12, 2008 at 5:23 AM, Dave Cotton <dcotton at linuxautrement.com> wrote:
> Hans Witvliet wrote:
>> There's not much that can stand lightning (not just a direct hit), so
>> you cant't blame the sipura box for that.
>> Even when it was build, using a Faraday-cage with double insulation with
>> optocouplers, the amount of energy picked up by a 3 km line is beyond
>> commercial engineerd products.
>
> So I've found out.
>
> We moved here exactly a year ago. Up until April everything was OK,
> That's after I forced the telco to virtually recable the whole run, (a
> neighbour likes to take pot shots at road signs etc. they actually found
> pellets in the cable)
>
> April we had a sequence of very violent thunderstorms, the first took
> out a Sipura 3102, a Linksys 8 port switch and the POE etc of an Aastra
> 9133i. The shock was so strong it caused the cutout at the meter to drop
> out, that's 200mtrs away.
>
> Exactly one week later a repeat performance, but this time I'd not
> replaced the Aastra.
>
> The third time I woke up to an enormous crash of thunder to see that the
> power had gone again, I was at the door of the office when the second
> strike occurred and actually saw the flash as the remaining SPA3000 I
> had grilled.
>
> When the electrician inspected the circuits the next day he told me the
> previous occupants had lost telephones nearly every time there was a big
> storm.  What is interesting is that crappy little handsets which take
> their power from the phone line survive and an ADSL modem on the same
> line has also survived.
>
> Who said lightening never strikes twice.
>
> DC
>
>
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-- 
Andrew "lathama" Latham
Principal
TuxTone Inc.
http://TuxTone.com
Andrew.Latham at TuxTone.com