"new" wrote in message
...
While wiring in a new phone jack I got zapped. I measured 55vots accross
b&y zand R&G pairs.

I eventually went to outside telephone interface and plugged into test jack
and found it coming from phone company.

There is no way this is normal is it?

You could add to that 90VAC when the phone rings.

Bob

While wiring in a new phone jack I got zapped. I measured 55vots accross
b&y zand R&G pairs.

I eventually went to outside telephone interface and plugged into test jack
and found it coming from phone company.

There is no way this is normal is it?

"new" wrote in message
...
While wiring in a new phone jack I got zapped. I measured 55vots accross
b&y zand R&G pairs.

I eventually went to outside telephone interface and plugged into test
jack and found it coming from phone company.

There is no way this is normal is it?

Why not? 60 volts at idle, 90 volts at ring.

new wrote:
While wiring in a new phone jack I got zapped. I measured 55vots accross
b&y zand R&G pairs.

I eventually went to outside telephone interface and plugged into test jack
and found it coming from phone company.

There is no way this is normal is it?




AC or DC?

Were you using a digital or analog meter?

Do your phones work OK?

Most standard phone lines are 48 volts DC with no phones on that line
"off hook".

I wouldn't worry much about measuring 55 volts.

You can feel a shock from much lower voltages, particularly if something
like the sharp end of a wire drags through the dry outer layer of your skin.

HTH,

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
"Rudeness is the weak man's imitation of strength."

Thanks for the fast response Bob. This is a constant 55 volts so it is not
involved with the ring (and it is on both pairs anyway).

I had thought I had an old pricess transformer around but when I went out to
the jack I was suprised.

Again: is this normal?


"Bob" wrote in message
. ..

"new" wrote in message
...
While wiring in a new phone jack I got zapped. I measured 55vots accross
b&y zand R&G pairs.

I eventually went to outside telephone interface and plugged into test
jack
and found it coming from phone company.

There is no way this is normal is it?

You could add to that 90VAC when the phone rings.

Bob

An analog meter and AC voltage.


"Jeff Wisnia" wrote in message
et...
new wrote:
While wiring in a new phone jack I got zapped. I measured 55vots accross
b&y zand R&G pairs.

I eventually went to outside telephone interface and plugged into test
jack and found it coming from phone company.

There is no way this is normal is it?


AC or DC?

Were you using a digital or analog meter?

Do your phones work OK?

Most standard phone lines are 48 volts DC with no phones on that line "off
hook".

I wouldn't worry much about measuring 55 volts.

You can feel a shock from much lower voltages, particularly if something
like the sharp end of a wire drags through the dry outer layer of your
skin.

HTH,

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
"Rudeness is the weak man's imitation of strength."

new wrote:
While wiring in a new phone jack I got zapped. I measured 55vots accross
b&y zand R&G pairs.

I eventually went to outside telephone interface and plugged into test jack
and found it coming from phone company.

There is no way this is normal is it?

Yes, normal and expected.

In the US while the line is idle one of the pair is at approx. ground,
and the other at approx. -48V DC.

Ring voltage is a 20Hz sine-wave of 90VAC on the -48V line (peak V is
90-48, or +42V, and -peak is -48 -90 or -138V).

Dave

new wrote:

An analog meter and AC voltage.


"Jeff Wisnia" wrote in message
et...

new wrote:

While wiring in a new phone jack I got zapped. I measured 55vots accross
b&y zand R&G pairs.

I eventually went to outside telephone interface and plugged into test
jack and found it coming from phone company.

There is no way this is normal is it?


AC or DC?

Were you using a digital or analog meter?

Do your phones work OK?

Most standard phone lines are 48 volts DC with no phones on that line "off
hook".

I wouldn't worry much about measuring 55 volts.

You can feel a shock from much lower voltages, particularly if something
like the sharp end of a wire drags through the dry outer layer of your
skin.

HTH,

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
"Rudeness is the weak man's imitation of strength."




Well, you will only have AC voltage on a phone line during a "ring", but
even though your meter is set to measure AC it will probably still give
you a reasonably accurate reading from DC voltages.

Anyway, I think enough folks have responded to assure you that what you
measured is normal enough.

Jeff



--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
"Rudeness is the weak man's imitation of strength."

yes

new wrote:
Thanks for the fast response Bob. This is a constant 55 volts so it is not
involved with the ring (and it is on both pairs anyway).

I had thought I had an old pricess transformer around but when I went out to
the jack I was suprised.

Again: is this normal?


"Bob" wrote in message
. ..
"new" wrote in message
...
While wiring in a new phone jack I got zapped. I measured 55vots accross
b&y zand R&G pairs.

I eventually went to outside telephone interface and plugged into test
jack
and found it coming from phone company.

There is no way this is normal is it?
You could add to that 90VAC when the phone rings.

Bob

new wrote:
While wiring in a new phone jack I got zapped. I measured 55vots accross
b&y zand R&G pairs.

I eventually went to outside telephone interface and plugged into test jack
and found it coming from phone company.

There is no way this is normal is it?

As others have said, voltage sounds about right. But you shouldn't
feel it under normal circumstances. You will get quite the jolt
sometimes if the phone rings while you are playing witht he wires.

You have voltage on both sets of wires. Do you have 2 lines coming in
to the house?

According to Pat :

new wrote:
While wiring in a new phone jack I got zapped. I measured 55vots accross
b&y zand R&G pairs.

I eventually went to outside telephone interface and plugged into test jack
and found it coming from phone company.

There is no way this is normal is it?

As others have said, voltage sounds about right. But you shouldn't
feel it under normal circumstances. You will get quite the jolt
sometimes if the phone rings while you are playing witht he wires.

Heh. For reasons I won't go into here, I had to splice a telephone
line while sitting on a concrete floor in our detached garage, and
I was too lazy to sling something non-conductive underneath me.

That _hurt_. Even without ringing. Was unable to grasp/twist
the wire.

The SO could hear me swearing over 100' away in the house.

Finally gave up and sat on a piece of plywood.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.

Chris Lewis wrote:
According to Pat :

new wrote:
While wiring in a new phone jack I got zapped. I measured 55vots accross
b&y zand R&G pairs.

I eventually went to outside telephone interface and plugged into test jack
and found it coming from phone company.

There is no way this is normal is it?

As others have said, voltage sounds about right. But you shouldn't
feel it under normal circumstances. You will get quite the jolt
sometimes if the phone rings while you are playing witht he wires.

Heh. For reasons I won't go into here, I had to splice a telephone
line while sitting on a concrete floor in our detached garage, and
I was too lazy to sling something non-conductive underneath me.

That _hurt_. Even without ringing. Was unable to grasp/twist
the wire.

The SO could hear me swearing over 100' away in the house.

Finally gave up and sat on a piece of plywood.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.

Huh. I always work on phones barehanded and never had a problem.
Trying to remember if I've ever worked on them barefoot, too, but can't
think of any time I did that. Never had a problem. Bared wires with a
jacknife, pulled off cut insulation with my teeth, etc.

Maybe it's just me. My mother always said she wanted me to be well
grounded, but I don't think this is what she meant.

What's the consensus. Do most people feel the voltage out of a phone
or not?

BTW, my father (an electrician) always said that ringer voltage was
esp. dangerous because it was close to the voltage of your heart. I
don't have any idea if that is true or just an old wives tale.

BTW, my father (an electrician) always said that ringer voltage was
esp. dangerous because it was close to the voltage of your heart. I
don't have any idea if that is true or just an old wives tale.

It's dangerous because it is AC and muscles respond to changes of voltage.

According to Pat :
That _hurt_. Even without ringing. Was unable to grasp/twist
the wire.

Huh. I always work on phones barehanded and never had a problem.

So do I. But have you ever done it whilst in shorts sitting on
bare concrete?

Trying to remember if I've ever worked on them barefoot, too, but can't
think of any time I did that. Never had a problem. Bared wires with a
jacknife, pulled off cut insulation with my teeth, etc.

Ordinary shoes/carpet make a _big_ difference.

What's the consensus. Do most people feel the voltage out of a phone
or not?

Generally speaking, if you're reasonably grounded (bare legs on
concrete ;-), most people start feeling things at around 35-40V.

BTW, my father (an electrician) always said that ringer voltage was
esp. dangerous because it was close to the voltage of your heart. I
don't have any idea if that is true or just an old wives tale.

I assure you, your heart doesn't run at 90V.

Ringer voltage is perhaps somewhat more, um, "memorable" for
two reasons. One is that it's closer to DC, which is inherently
somewhat nastier than the same voltage in AC. The second, more
important one, is that you're firmly grasping it thinking all is
right with the world, and _zap_ out of nowhere, you get hit.

Since your muscles are already gripping it, the ringer voltage
tends to keep you gripping it even harder. Longer duration
contact. Maybe a whole ring cycle before you can let go.

In contrast, you don't usually have anywhere near as good a
connection to line voltage when things start to hurt, and short
of a "fall into" or a misguided "firm grab", the muscular reaction
tends to knock your hand or finger _away_. Grab that switched
off switch leg firmly, and have someone flip the switch on. That's
very much different, and vastly more likely to be lethal than
a mere "graze".
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.

Actually DC can be just as dangerous as AC. The heart muscle "clamps"
instead of going into VF. If the current vector goes across the chest, it
can be more dangerous than AC mains.

Yes, the "close to the voltage of the heart" is an old wive's tale (in fact
I haven't ever heard that tale myself). The ion channels that produce the
muscle contraction aren't working anywhere near telephone ringer voltage.

"Stubby" wrote in message
. ..

BTW, my father (an electrician) always said that ringer voltage was
esp. dangerous because it was close to the voltage of your heart. I
don't have any idea if that is true or just an old wives tale.

It's dangerous because it is AC and muscles respond to changes of voltage.

On Tue, 05 Sep 2006 20:55:05 -0000, (Chris
Lewis) wrote:

According to Pat :
That _hurt_. Even without ringing. Was unable to grasp/twist
the wire.

Huh. I always work on phones barehanded and never had a problem.

So do I. But have you ever done it whilst in shorts sitting on
bare concrete?

Trying to remember if I've ever worked on them barefoot, too, but can't
think of any time I did that. Never had a problem. Bared wires with a
jacknife, pulled off cut insulation with my teeth, etc.

Ordinary shoes/carpet make a _big_ difference.

What's the consensus. Do most people feel the voltage out of a phone
or not?

Generally speaking, if you're reasonably grounded (bare legs on
concrete ;-), most people start feeling things at around 35-40V.

BTW, my father (an electrician) always said that ringer voltage was
esp. dangerous because it was close to the voltage of your heart. I
don't have any idea if that is true or just an old wives tale.

I assure you, your heart doesn't run at 90V.

Ringer voltage is perhaps somewhat more, um, "memorable" for
two reasons. One is that it's closer to DC, which is inherently
somewhat nastier than the same voltage in AC. The second, more
important one, is that you're firmly grasping it thinking all is
right with the world, and _zap_ out of nowhere, you get hit.

Since your muscles are already gripping it, the ringer voltage
tends to keep you gripping it even harder. Longer duration
contact. Maybe a whole ring cycle before you can let go.

In contrast, you don't usually have anywhere near as good a
connection to line voltage when things start to hurt, and short
of a "fall into" or a misguided "firm grab", the muscular reaction
tends to knock your hand or finger _away_. Grab that switched
off switch leg firmly, and have someone flip the switch on. That's
very much different, and vastly more likely to be lethal than
a mere "graze".
--

The on-hook voltage is DC and is going to be around 40-50 volts and
the current is near zero. You can feel this under certain
circumstances. The voltage drops dramatically when the phone goes off
the hook to perhaps 9 volts or so. Standing on a ground is not
usually a problem around telephone wires unless you are in an
electrical storm. The loop (off hook) current is limited by a
resistor at the phone exchange to about 20 ma or so, even if the wires
are shorted together.

Long lines in rural areas might have higher loop current, but again,
phone wiring is not considered dangerous except with the thunderstorm
exception.

Ring voltage is going to be higher, anywhere from 90 volts AC or
higher, but normally not with enough current to kill you unless you
are at the top of a telephone poll and the shock you receive causes
you to fall off and break your neck.

Remember, transformers only pass AC and block DC. (Telephone audio
signals are considered AC even though they are really varying DC. - A
transformer is said to pass the AC component of the DC as long as it
is not overdriven or saturated).

Capacitors block DC and pass AC.

Beachcomber

In article ,
"new" wrote:

Thanks for the fast response Bob. This is a constant 55 volts so it is not
involved with the ring (and it is on both pairs anyway).

I had thought I had an old pricess transformer around but when I went out to
the jack I was suprised.

Again: is this normal?

Probably. Someone probably rang your phone at JUST the right time for you to
get really ZAPPED. Either that or you were WELL grounded when touching the
live wires.

Dialtone is -48-52VDC. I've never metered it at 55, but I suppose its
possible. We VERY rarely disconnect a working pair before working on it.

You'll notice inside the S/NI/D it says something like [to avoid shock, you
should disconnect the service prior to working on it]. Good advise, I guess.
--

JR

In article , "glenn P"
wrote:

Actually DC can be just as dangerous as AC.

Agreed.

An electric chair uses DC somewhere in the neighborhood of 2,000-volts.
--

JR

On Tue, 05 Sep 2006 21:58:50 -0500, Jim Redelfs
wrote:

In article , "glenn P"
wrote:

Actually DC can be just as dangerous as AC.

Agreed.

An electric chair uses DC somewhere in the neighborhood of 2,000-volts.

At one time "westinghouse" meant "electrocute"?

unknown wrote:

On Tue, 05 Sep 2006 21:58:50 -0500, Jim Redelfs
wrote:


In article , "glenn P"
wrote:


Actually DC can be just as dangerous as AC.

Agreed.

An electric chair uses DC somewhere in the neighborhood of 2,000-volts.


At one time "westinghouse" meant "electrocute"?


I used to think it described a place where you went to "west" after a
long day's work.

I remember the stories about the Edison (DC) and Westinghouse (AC)
rivalry and how Edison argued that AC was more dangerous. Edison even
went so far as to electrocute an elephant to support his case.

Don't watch this if you're an animal rights type:

http://www.youtube.com/watch?v=RnHXS...son%20elephant

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
"Rudeness is the weak man's imitation of strength."

On Wed, 06 Sep 2006 12:03:38 -0400, Jeff Wisnia
wrote:

unknown wrote:

On Tue, 05 Sep 2006 21:58:50 -0500, Jim Redelfs
wrote:


In article , "glenn P"
wrote:


Actually DC can be just as dangerous as AC.

Agreed.

An electric chair uses DC somewhere in the neighborhood of 2,000-volts.


At one time "westinghouse" meant "electrocute"?


I used to think it described a place where you went to "west" after a
long day's work.


Sounds right. I remember when I didn't understand names well, and
thought they were words. Some examples:

"Plymouth" is a disease you get from eating tires

"Douglas" ('dough glass') is a kind of plastic found in airplane
windows

"Prestolock" (found on my mother's pressure cooker) means "press to
lock"

"Fedders" (on an ice tray) means it's meant to be used to feed birds

I remember the stories about the Edison (DC) and Westinghouse (AC)
rivalry and how Edison argued that AC was more dangerous.

I have a book that has a chapter about that. It's called "current
wars".

Edison even
went so far as to electrocute an elephant to support his case.

Don't watch this if you're an animal rights type:


BTW, Those who want to change 'dead' to 'fed' when describing
Schrodinger's Cat.

http://www.youtube.com/watch?v=RnHXS...son%20elephant


I guess they're overloaded. That might explain how I have a (otherwise
unused at this time) 4mbps connection and that downloaded at around
8Kbps.

Jeff
--
110 days until the winter solstice celebration

Mark Lloyd
http://notstupid.laughingsquid.com

"All your western theologies, the whole mythology of them,
are based on the concept of God as a senile delinquent."
-- Tennessee Williams

An electric chair uses DC somewhere in the neighborhood of 2,000-volts.
--

JR

Not True. Electric Chairs use AC.... not DC and the voltages have
varied depending on the state and locality. Sing Sing Prison was
known for its higher voltage chair, in particular.

http://www.straightdope.com/classics/a1_219.html

Beachcomber

Mark Lloyd wrote:
On Wed, 06 Sep 2006 12:03:38 -0400, Jeff Wisnia
wrote:

unknown wrote:

On Tue, 05 Sep 2006 21:58:50 -0500, Jim Redelfs
wrote:


In article , "glenn P"
wrote:


Actually DC can be just as dangerous as AC.

Agreed.

An electric chair uses DC somewhere in the neighborhood of 2,000-volts.


At one time "westinghouse" meant "electrocute"?


I used to think it described a place where you went to "west" after a
long day's work.


Sounds right. I remember when I didn't understand names well, and
thought they were words. Some examples:

"Plymouth" is a disease you get from eating tires

"Douglas" ('dough glass') is a kind of plastic found in airplane
windows

"Prestolock" (found on my mother's pressure cooker) means "press to
lock"

"Fedders" (on an ice tray) means it's meant to be used to feed birds

I remember the stories about the Edison (DC) and Westinghouse (AC)
rivalry and how Edison argued that AC was more dangerous.

I have a book that has a chapter about that. It's called "current
wars".

Edison even
went so far as to electrocute an elephant to support his case.

Don't watch this if you're an animal rights type:


BTW, Those who want to change 'dead' to 'fed' when describing
Schrodinger's Cat.

http://www.youtube.com/watch?v=RnHXS...son%20elephant


I guess they're overloaded. That might explain how I have a (otherwise
unused at this time) 4mbps connection and that downloaded at around
8Kbps.

Jeff
--
110 days until the winter solstice celebration

Mark Lloyd
http://notstupid.laughingsquid.com

"All your western theologies, the whole mythology of them,
are based on the concept of God as a senile delinquent."
-- Tennessee Williams

Boy has this thread taken a weird twist. From telephones to
electrocuting elephants. Who'd have thunk it.

Back then, they electrocuted elephants to prove they could. Now, they
can't test shampoo on a rat. How the world has changed....

Jeff Wisnia wrote:

At one time "westinghouse" meant "electrocute"?

I remember the stories about the Edison (DC) and Westinghouse (AC)
rivalry and how Edison argued that AC was more dangerous. Edison even
went so far as to electrocute an elephant to support his case.


Edison labs were used for research on the electric chair, electrocuting
various animals. This was part of Edison's attempt to show that AC was
dangerous. The first use of an electric chair (which used AC) was
horribly botched; the first attempt didn't work and the second was
gruesome. IIRC using "westinghouse" to be the same as "electrocute" was
part of Edison's PR campaign against AC.

There is an interesting recent book on the Edison - Westinghouse/Tesla
war (the name of which I don't remember).

bud--

On 7 Sep 2006 08:41:09 -0700, "Pat"
wrote:


Mark Lloyd wrote:
On Wed, 06 Sep 2006 12:03:38 -0400, Jeff Wisnia
wrote:


[snip]

BTW, Those who want to change 'dead' to 'fed' when describing
Schrodinger's Cat.

http://www.youtube.com/watch?v=RnHXS...son%20elephant


I guess they're overloaded. That might explain how I have a (otherwise
unused at this time) 4mbps connection and that downloaded at around
8Kbps.

Jeff
-- Tennessee Williams

Boy has this thread taken a weird twist. From telephones to
electrocuting elephants. Who'd have thunk it.

Back then, they electrocuted elephants to prove they could. Now, they
can't test shampoo on a rat. How the world has changed....

I remember reading a story about a near future, where they tested new
products on people because they didn't have "animal rights".
--
109 days until the winter solstice celebration

Mark Lloyd
http://notstupid.laughingsquid.com

"All your western theologies, the whole mythology of them,
are based on the concept of God as a senile delinquent."
-- Tennessee Williams

On Thu, 07 Sep 2006 10:43:05 -0500, Bud--
wrote:

Jeff Wisnia wrote:

At one time "westinghouse" meant "electrocute"?

I remember the stories about the Edison (DC) and Westinghouse (AC)
rivalry and how Edison argued that AC was more dangerous. Edison even
went so far as to electrocute an elephant to support his case.


Edison labs were used for research on the electric chair, electrocuting
various animals. This was part of Edison's attempt to show that AC was
dangerous. The first use of an electric chair (which used AC) was
horribly botched; the first attempt didn't work and the second was
gruesome. IIRC using "westinghouse" to be the same as "electrocute" was
part of Edison's PR campaign against AC.

There is an interesting recent book on the Edison - Westinghouse/Tesla
war (the name of which I don't remember).

bud--

I suppose I haven't seen that book, that's just a single chapter in
the one I have. That book has stories about different inventions
(including Telephone and Microwave Oven).
--
109 days until the winter solstice celebration

Mark Lloyd
http://notstupid.laughingsquid.com

"All your western theologies, the whole mythology of them,
are based on the concept of God as a senile delinquent."
-- Tennessee Williams

According to Beachcomber :

The on-hook voltage is DC and is going to be around 40-50 volts and
the current is near zero. You can feel this under certain
circumstances. The voltage drops dramatically when the phone goes off
the hook to perhaps 9 volts or so. Standing on a ground is not
usually a problem around telephone wires unless you are in an
electrical storm. The loop (off hook) current is limited by a
resistor at the phone exchange to about 20 ma or so, even if the wires
are shorted together.

Remember that 20ma is potentially lethal under some circumstances,
however, getting hit by that much is _extremely_ unlikely (given
voltages and normal circumstances during handling of the wire).

[Even while sitting on a concrete floor in shorts ;-)]

Long lines in rural areas might have higher loop current, but again,
phone wiring is not considered dangerous except with the thunderstorm
exception.

Well, you sit in shorts on my concrete garage floor and touch the
wiring. ;-)

It's not likely to have been dangerous in terms of harm, but it
was certainly enough of a tingle to make it impossible to
make the wiring connections I wanted to do.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.

A little clarification:
On-hook voltage (hung up): 48V DC +/-10% at the demarc.
If it's outside that range, it doesn't meet specs.

Off-hook (receiver picked up: Between 8 and 14 V DC, depending on a LOT of
things.
Ringing Voltage: 90 V ac, riding ON 48V DC (90*1.414+48 = Approximate peak
voltage. The RMS of that figure exceeds the 42V "safety limit" for humans
to touch without possible lethal results, but, due to timing:
That is PLENTY to feel as a shock and can cause muscle convulsions &
injury, not usually death unless there is a pre existing heart condition or
the sitution lasts too long.
Ring frequency is 30 Hz unless special ring voltage features are used.
Ring is 2S on and 4 S off. One full ring cycle takes 6 seconds unless
special rings are provided by the telco.
Offhook current is limited to 110mA at the telco. Therefore, neglecting the
resistanct of the wiring between the phone and the telco, a shorted tip/ring
would provide up to about 100mA +/-. Realistically it's much lower as not
many phones are close enough to the telco to be able to draw that much
current (line resistance).

Off-hook ac voltages must meet strict longitudinal balance specs.

Just FWIW.

Pop`



Chris Lewis wrote:
According to Beachcomber :

The on-hook voltage is DC and is going to be around 40-50 volts and
the current is near zero. You can feel this under certain
circumstances. The voltage drops dramatically when the phone goes
off the hook to perhaps 9 volts or so. Standing on a ground is not
usually a problem around telephone wires unless you are in an
electrical storm. The loop (off hook) current is limited by a
resistor at the phone exchange to about 20 ma or so, even if the
wires are shorted together.

Remember that 20ma is potentially lethal under some circumstances,
however, getting hit by that much is _extremely_ unlikely (given
voltages and normal circumstances during handling of the wire).

[Even while sitting on a concrete floor in shorts ;-)]

Long lines in rural areas might have higher loop current, but again,
phone wiring is not considered dangerous except with the thunderstorm
exception.

Well, you sit in shorts on my concrete garage floor and touch the
wiring. ;-)

It's not likely to have been dangerous in terms of harm, but it
was certainly enough of a tingle to make it impossible to
make the wiring connections I wanted to do.

Pop` wrote:
A little clarification:
On-hook voltage (hung up): 48V DC +/-10% at the demarc.
If it's outside that range, it doesn't meet specs.

Off-hook (receiver picked up: Between 8 and 14 V DC, depending on a LOT of
things.
Ringing Voltage: 90 V ac, riding ON 48V DC (90*1.414+48 = Approximate peak
voltage.
Ring frequency is 30 Hz unless special ring voltage features are used.

SNIPPAGE

Just to clarify: Ring freq may be 30Hz where you live,
but the much more common freq in the US (Bell Sys) is 20Hz.

Independents used a wide range of "harmonic ringing frequencies"
with ringers mechanically tuned to each freq.

Speedy Jim wrote:
Pop` wrote:
A little clarification:
On-hook voltage (hung up): 48V DC +/-10% at the demarc.
If it's outside that range, it doesn't meet specs.

Off-hook (receiver picked up: Between 8 and 14 V DC, depending on a
LOT of things.
Ringing Voltage: 90 V ac, riding ON 48V DC (90*1.414+48 =
Approximate peak voltage.
Ring frequency is 30 Hz unless special ring voltage features are
used.

SNIPPAGE

Just to clarify: Ring freq may be 30Hz where you live,
but the much more common freq in the US (Bell Sys) is 20Hz.

Independents used a wide range of "harmonic ringing frequencies"
with ringers mechanically tuned to each freq.

Oops, nope: I believe you're right. 30Hz should have been 20Hz. My
mistake.

Good catchg

Pop`

A little clarification:
On-hook voltage (hung up): 48V DC +/-10% at the demarc.
If it's outside that range, it doesn't meet specs.
Off-hook (receiver picked up: Between 8 and 14 V DC, depending on
a LOT of things.

What about a cable phone line?

On Sun, 10 Sep 2006 15:12:30 GMT, Bert Byfield
wrote:

A little clarification:
On-hook voltage (hung up): 48V DC +/-10% at the demarc.
If it's outside that range, it doesn't meet specs.
Off-hook (receiver picked up: Between 8 and 14 V DC, depending on
a LOT of things.

What about a cable phone line?




You'd probably have an interface device between the cable and a
regular phone. That would mean the voltages would have to be similar,
to get that phone to work.
--
106 days until the winter solstice celebration

Mark Lloyd
http://notstupid.laughingsquid.com

"How could you ask be to believe in God when there's
absolutely no evidence that I can see?" -- Jodie Foster

Pop` posted for all of us...

Off-hook ac voltages must meet strict longitudinal balance specs.

What does this mean?
--
Tekkie "There's no such thing as a tool I don't need."

In article ,
Tekkie® wrote:

Off-hook ac voltages must meet strict longitudinal balance specs.

What does this mean?

Each side of the pair (ring and tip) must be of "equal" length. This reduces
or eliminates noise (hum) on the line.
--

JR