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Telco Line Fault??

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ABLE1

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Apr 26, 2010, 7:11:28 PM4/26/10
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Hey to all,

I installed a new Fireworx FX-64RD panel a couple of months ago. Almost
from day one started to receive sporadic Telco Line Faults. Both Line 1 and
Line 2. Little correlation can be determined except it happens 9 times out
of 10 during the week Monday - Friday and during the day 9am to 5 pm. In
other words 90% of the time during working hours. (aka when the phone are
likely to be used)

It happens 1 to 3 times in a given day and then skip a day or two.

It was originally connected to their Line 1 and Fax Line, I have moved to
L-1 and L-3 no help. It is now on L-1 and L-2 and am waiting to see how it
goes. Line 1 happens less frequent so I have left it alone.

In calling UTC Tech Support........................... I was told that the
threshold voltage is 10vdc.

I have gotten the 10vdc from a couple of different techs so that must be the
number but it seems to be on high side. I remember on a burg panel that I
was having a problem a couple of years ago I was told the threshold was
6vdc.

What I am reading at the panel is 6.5 to 7.5vdc when a phone is off hook.
So if the threshold is 10vdc then the panel is going to go into trouble
after the timeout of 2 minutes which is the maximum.

The lines that I am working with are (what I think is) POTS lines on copper.
However I was told that if there is a digital converter?? it could cause
some trouble. How do I determine if this is the case???

Has anyone here experienced this?? Especially on this panel??

Any additional thoughts that may help would be appreciated.

TIA

Les


Jim Rojas

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Apr 26, 2010, 7:51:26 PM4/26/10
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Do you have these connected for proper line seizure?

Jim Rojas


ABLE1

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Apr 26, 2010, 8:29:06 PM4/26/10
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"Jim Rojas" <jro...@tech-man.com> wrote in message
news:4GpBn.93884$kj3....@newsfe08.iad...

Jim,

Yes, I have RJ31X's on both lines.

Thanks for thinking on this.

Les


Jim Rojas

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Apr 26, 2010, 8:32:16 PM4/26/10
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Check Viking's website. They might have something to help boost the line
voltage.

Jim Rojas

nick markowitz

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Apr 26, 2010, 8:43:54 PM4/26/10
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Improper / dirty grounding can cause line fault problems double check
your grounds.

ABLE1

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Apr 26, 2010, 9:00:18 PM4/26/10
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"nick markowitz" <nmark...@gmail.com> wrote in message
news:8274b13b-9bf6-4ebb...@q8g2000vbm.googlegroups.com...


Nick & Jim,

Are you guys thinking that 6.5 and 7.5vdc is really low?? Or is the 10vdc
threshold high??

What values have you seen with off hook voltages??

Thanks,

Les

Doug

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Apr 26, 2010, 9:07:55 PM4/26/10
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"ABLE1" <royboy...@somewhere.net> wrote in message
news:z4pBn.55010$vX7....@en-nntp-11.dc1.easynews.com...

If the threshold really is 10 volts, which as you say sounds too high, and
off hook you measure 6.5 to 7.5 volts which sounds about right then other
than changing to dedicated lines you are going to struggle to resolve this.

Honestly I can't see that the threshold voltage is really set at 10 volts or
it would be a major issue for them.

Doug


ABLE1

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Apr 26, 2010, 9:36:16 PM4/26/10
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"Doug" <n...@home.com> wrote in message
news:MNqBn.91758$iL1....@newsfe24.iad...

This is kinda where I am going on this, and I am glad you pointed it out.
I am wonder if the UL 864 specifies the voltage threshold in some way to
some how dictate that dedicated lines be used for fire panels??

I keep getting this statement from tech support that "UL requires dedicated
lines."

I am trying to get someone at UTC to explain the 10vdc threshold but it is
difficult.

Aside from that I will look into the ground and Viking issues.

Thanks,

Les


Rockytsquirrel

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Apr 26, 2010, 10:40:06 PM4/26/10
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I've noticed in rural Kentucky the pots line runs around 6 vdc but if
it has DSL it will run around 12 vdc..

Some of the newer equipment manuf. are setting there equipment to the 9-10
vdc limit..
(I was told that they expect most if not all off-hook voltages will be
raised to the higher limit..)

I doubt that will happen anytime soon in the third world phones of
Kentucky.
AT&T has been loosing ground to bad maintenance and failing equipment since
they took over BellSouth..


"ABLE1" <royboy...@somewhere.net> wrote in message

news:UmrBn.213044$Bs1....@en-nntp-01.dc1.easynews.com...

John R. Sowden

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May 31, 2010, 11:09:25 PM5/31/10
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ABLE1 wrote:

Regarding the voltage, on hook telco is about 50 volts (48 volt
batteries in the CO plus the excess to charge them).
Re the troubles, check to see if any prem phones have been installed
onto the ring and tip terminals instead of the output of the RJ. Some
panels look for a current flow when the voltage drops to the off-hook
level. If there is no phone off hook on the RJ output, then there is
no current flow. If you take an ohmmeter reading from tip in to tip
out, and ring in to ring out, you might see a small ohms difference.
This is the sense resistor that the panel is reading a voltage across
to determine if there is a current flow (ohm's law). The problem is
that telco people put their things on ring and tip, disregarding the
RJ hookup.

Hope this helps.
John Sowden
American Sentry

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