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'[OT:] UK vs. US Telephones'
2004\08\18@232051 by Andrew Warren

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A friend found a phone (wired, not cellular) for sale on the web, and
she wants to buy it, but she was told that it works only in the UK
and won't work here in the US.

Anyone know why not?

Thanks.

-Andy

=== Andrew Warren - spam_OUTaiwTakeThisOuTspamcypress.com
===
=== Principal Design Engineer
=== Cypress Semiconductor Corporation

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2004\08\18@233541 by Dave VanHorn

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At 10:22 PM 8/18/2004, Andrew Warren wrote:

>A friend found a phone (wired, not cellular) for sale on the web, and
>she wants to buy it, but she was told that it works only in the UK
>and won't work here in the US.

They are grossly similar electrically, but it won't be certified for part 68 compliance, and it will have the wrong plug. (shades of "Help")

AFAIK Anything that passes BABT for POTS should work on US lines.

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2004\08\19@061655 by cdb

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:: AFAIK Anything that passes BABT for POTS should work on US lines.

I believe one big difference is the ringing signal - in the UK this is
an extra signal line (and is combined in the phone) in the US it is
impressed at the HO - the phone will work but not ring, without some
minor  rewiring.

I know that the isolation specs and power specs are different for US
bound phones.

If I knew where I'd put it there is an ex BT engineers webpage that
shows the differences between the wiring systems.

Colin
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cdb, .....bodgy1KILLspamspam.....optusnet.com.au on Thursday,19 August,2004

I have always been a few Dendrites short of an Axon and believe me it
shows.

Light travels faster than sound. That's why some people appear bright
until they speak!

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2004\08\19@064013 by hael Rigby-Jones

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>-----Original Message-----
>From: pic microcontroller discussion list
>[EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU] On Behalf Of cdb
>Sent: 19 August 2004 11:17
>To: PICLISTspamspam_OUTMITVMA.MIT.EDU
>Subject: Re: [OT:] UK vs. US Telephones
>
>
>:: AFAIK Anything that passes BABT for POTS should work on US lines.
>
>I believe one big difference is the ringing signal - in the UK
>this is an extra signal line (and is combined in the phone) in
>the US it is impressed at the HO - the phone will work but not
>ring, without some minor  rewiring.
>

There are only two wires entering the house in the UK.  The master socket
splits the ring signal off with a capacitor, but the incomming lines
(including the ringing voltage) are still routed directly to the sockets.

http://www.wppltd.demon.co.uk/WPP/Wiring/UK_telephone/uk_telephone.html

Mike


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2004\08\19@133113 by Andrew Warren

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Michael Rigby-Jones <@spam@PICLISTKILLspamspammitvma.mit.edu> wrote:

> There are only two wires entering the house in the UK.  The master
> socket splits the ring signal off with a capacitor, but the incomming
> lines (including the ringing voltage) are still routed directly to the
> sockets.
>
> www.wppltd.demon.co.uk/WPP/Wiring/UK_telephone/uk_telephone.htm
> l

   Thanks, Mike (and others).  Looks as though she can make the
   phone work here by buying a master socket from someone in the UK
   and putting it between the phone and her USA wiring.  She'll be
   very pleased.

   -Andrew

=== Andrew Warren -- KILLspamaiwKILLspamspamcypress.com
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=== Opinions expressed above do not
=== necessarily represent those of
=== Cypress Semiconductor Corporation

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2004\08\19@134356 by Randy Abernathy

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In a message dated 8/19/2004 1:32:38 PM Eastern Daylight Time,
RemoveMEaiwTakeThisOuTspamCYPRESS.COM writes:

There  are only two wires entering the house in the UK.  The master
>  socket splits the ring signal off with a capacitor, but the incomming
>  lines (including the ringing voltage) are still routed directly to the
>  sockets.



Actually, here in the U.S., there are only two wires per phone line  as well
and the ringing signal/current goes over them so I would agree that as  long
as an adapter can be obtained it should work

Randy  Abernathy
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Acworth, GA 30101-4066
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E-mail: spamBeGoneCnc002spamBeGonespamaol.com

I  furnish technical support, repair, and other related services for your
industrial woodworking machinery. My background as Senior Service Engineer for
the SCMI Group for nearly fifteen years with factory training, combines with
my  extensive background in electronics, mechanics, pneumatics, electrical and
CNC  machinery to offer you needed support for your  machinery.

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2004\08\19@141212 by Peter L. Peres

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>A friend found a phone (wired, not cellular) for sale on the web, and
>she wants to buy it, but she was told that it works only in the UK
>and won't work here in the US.

I know that some (?) UK phones have separate ringer and voice circuits
(there are two pairs wired into the house ?). To modify a UK phone to work
somewhere else one connects the two pairs together and hopes for the best
(the voice circuits are not guaranteed to withstand ringer voltage
although they should withstand much more severe transients like lightning
in the line etc). They also have lower voltage varistors on the voice
circuits that would trip on the ringer voltage ? Anyone in the UK who can
clarify ?

hope this helps,

Peter

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2004\08\20@043741 by Alan B. Pearce

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>Thanks, Mike (and others).  Looks as though she can make the
>phone work here by buying a master socket from someone in the UK
>and putting it between the phone and her USA wiring.  She'll be
>very pleased.

She may be able to get an adapter plug which are sometimes available for
connecting such phones to RJ45 type cabling in business premises where the
building has been wired through for computer LAN, and some of it is used for
phones. Every desk then has two RJ45 sockets on the wall, and an adapter
plug is used for an analogue connection.

However I am not sure if the adapter has the capacitor in it. :)))

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2004\08\20@051930 by hael Rigby-Jones

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{Quote hidden}

BT don't sell master sockets AFAIK, as they are supposed to be the only
people fitting them. However http://www.solwise.co.uk/telesun.htm sell all
sorts of usefull bits, including master sockets and all sorts of adpaters.
I have no idea if they ship to the US though.

Mike

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2004\08\20@052552 by hael Rigby-Jones

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{Quote hidden}

Further to my last post I think have found exactly what you need:

http://www.euronetwork.co.uk/acatalog/Telephone_Modem_Adaptors.html

This converts a US plug to a UK socket and includes the ringer circuit.
Again don't know if they ship to US or not.  If not I would be happy to buy
it and ship it out to you.

Mike


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2004\08\20@084111 by Bob Ammerman

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Since all you really care about is the ring capacitor, why not just build
your own adapter rather than trying to get a UK master socket.

Bob Ammerman
RAm Systems

----- Original Message -----
From: "Michael Rigby-Jones" <RemoveMEMichael.Rigby-JonesTakeThisOuTspamspamBOOKHAM.COM>
To: <EraseMEPICLISTspamspamspamBeGoneMITVMA.MIT.EDU>
Sent: Friday, August 20, 2004 5:23 AM
Subject: Re: [OT:] UK vs. US Telephones


> >{Original Message removed}

2004\08\20@101452 by Dave VanHorn

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At 04:27 AM 8/20/2004, Michael Rigby-Jones wrote:

>>-----Original Message-----
>>From: pic microcontroller discussion list
>>[RemoveMEPICLISTKILLspamspamMITVMA.MIT.EDU] On Behalf Of Andrew Warren
>>Sent: 19 August 2004 18:33
>>To: PICLISTSTOPspamspamspam_OUTMITVMA.MIT.EDU
>>Subject: Re: [OT:] UK vs. US Telephones
>>
>>
>>Michael Rigby-Jones <spamBeGonePICLISTSTOPspamspamEraseMEmitvma.mit.edu> wrote:
>>
>>> There are only two wires entering the house in the UK.  The master
>>> socket splits the ring signal off with a capacitor, but the
>>incomming
>>> lines (including the ringing voltage) are still routed
>>directly to the
>>> sockets.

In the end, it's just a capacitor...

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2004\08\20@120200 by Andrew Warren
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On 20 Aug 2004 at 8:40, Bob Ammerman wrote:

> Since all you really care about is the ring capacitor, why not just
> build your own adapter rather than trying to get a UK master socket.

   Good advice, but a master socket is available for just a few
   dollars, and it'll take no longer to arrive here than the phone
   will.

   Besides, I'm a software guy; building my own adapter sounds like
   it'll involve scary, mysterious stuff like soldering.  Yikes!

   -Andy

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2004\08\20@120749 by Andrew Warren

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On 20 Aug 2004 at 10:27, Michael Rigby-Jones wrote:

> http://www.euronetwork.co.uk/acatalog/Telephone_Modem_Adaptors.html
>
> This converts a US plug to a UK socket and includes the ringer circuit.
> Again don't know if they ship to US or not.  If not I would be happy to
> buy it and ship it out to you.

   Thank you, Mike, that's very kind.

   I've already found and ordered an adapter, but I appreciate the
   offer.

   -Andy

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2004\08\21@023114 by Richard Prosser

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And the line levels are different. She will hear everything  on the quiet
side while everyone else will hear her booming in. Or it might be the other
way around
RP






>{Original Message removed}

2004\08\21@094243 by Dave VanHorn

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At 01:03 AM 8/21/2004, Richard Prosser wrote:

>And the line levels are different. She will hear everything  on the quiet
>side while everyone else will hear her booming in. Or it might be the other
>way around
>RP

Levels won't do that, but impedances might.
I don't remember offhand if they are significantly different.

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