I have an ageing panasonic PABX that is capable of feedi9ng either
straight POTS or digital p[hones.

To feed a POTS its uses two wire extenbsion cabling and a master socket
with ring cap.

To feed digital phones it uses 4 wires.

Ive now acquired a bargian bundle of panasonic digital phones for it,
but of course they don't currently work.

My question is this: is it possible to wire the BT sockets so as to be
able to accept either phone? The signal wires are identical, the digital
just adds two more wires to the other two terminals BUT one of those has
the ring cap on it currently.

Its probably not a disater if I have to cut those out...but it would be
nice to be able to plug either phone in and have it work.

Do modern phones need the ring cap?





--
"When a true genius appears in the world, you may know him by this sign,
that the dunces are all in confederacy against him."

Jonathan Swift.

On Friday, 5 October 2018 09:48:44 UTC+1, The Natural Philosopher wrote:

Do modern phones need the ring cap?

No

John

On Fri, 5 Oct 2018 02:16:44 -0700 (PDT), wrote:

On Friday, 5 October 2018 09:48:44 UTC+1, The Natural Philosopher wrote:

Do modern phones need the ring cap?

No

;-)

In the old days, all the handsets (master / extensions) were wired in
parallel and the bells in series (with the ringing cap in the master
phone) with a pair of contacts in the dial to disconnect (or short?)
the bell circuit as you loop disconnect dial to prevent bell tinkle.

http://www.telephonesuk.co.uk/images...46_image1a.jpg

With the advent of multi frequency dialling, you didn't have bell
tinkle so they often put the ringing cap in the handset in parallel
with the main pair and then also in the BT box.

I feel I have been very lucky in my life / career as I worked for BT
when we went from wired to plug in phones (and lots of people were
having issues with their phones and extensions), then being interested
in computers myself I was in a good position to deal with them
commercially and for friends and family, along with dial-up modems
(again, I was repairing 300 baud modems with BT when they were as big
as a desktop PC). Then it was WiFi that was a bit of a black art and
again, I was often called in to sort 'problems', typically with
inter-compatibility. There was also the early uptake of ADSL and
generic routers that needed a bit of configuration.

Then, as an opportunity of giving some of that back, IT training for 7
years. I would still rather do a 24 hour shift building, installing,
wiring a load of LAN / WAN cabinets than an 8 hour day training,
because it was such draining work.

Only ever really considered myself a 'Jack of all (well, many) trades'
but then that suits my nature and seemed to also suit my friends and
family. ;-)

Back OT, our 1x5 PABX can support LD and MF dialling and has a std BT
(master) socket on the end of each extension. We do still have one LD
phone (on a very old Telephone Alarm Clock Radio) but because it's on
it's own line, don't have any bell tinkle or ringing issues.

Cheers, T i m

On Friday, 5 October 2018 09:48:44 UTC+1, The Natural Philosopher wrote:
My question is this: is it possible to wire the BT sockets so as to be
able to accept either phone? The signal wires are identical, the digital
just adds two more wires to the other two terminals BUT one of those has
the ring cap on it currently.

Possibly. The problem is that a 3-wire phone (as well as needing the ring cap in a master socket) will cause a short between the data wire on 3 and the B line wire on 5.

I've used LJ4 sockets, cut out the bell capacitor and out of circuit resistor on the proprietary phone, so I can use either a proprietary phone or a standard phone (or both in parallel) on a KX-TA system.

http://wiki.diyfaq.org.uk/index.php/...-wiring-UK.JPG

The latest version "digital" keyphones won't work on the older version "hybrid" systems so that might also be the problem

Owain

I have an ageing panasonic PABX t

But one without a model number apparently?

Let's see, it's been a long time but IIRC
in an A series (A-308 etc) no you can't,

On the GX series I think you can plug a POT into any extension socket,
but there might have been a proviso, something on the lines of BT
configuring the trunks for pulse dial only otherwise the exchange
heard each digit twice, once from the POTs phone itself and once from
the system.

As I say, it was a long time ago.
--

Graham.
%Profound_observation%

"The Natural Philosopher" wrote in message
news



I have an ageing panasonic PABX that is capable of feedi9ng either straight
POTS or digital p[hones.

To feed a POTS its uses two wire extenbsion cabling and a master socket
with ring cap.

To feed digital phones it uses 4 wires.

Ive now acquired a bargian bundle of panasonic digital phones for it, but
of course they don't currently work.

My question is this: is it possible to wire the BT sockets so as to be able
to accept either phone? The signal wires are identical, the digital just
adds two more wires to the other two terminals BUT one of those has the
ring cap on it currently.

Its probably not a disater if I have to cut those out...but it would be
nice to be able to plug either phone in and have it work.

Do modern phones need the ring cap?






DBS system by any chance ?

Andrew

On Friday, 5 October 2018 09:48:44 UTC+1, The Natural Philosopher wrote:
I have an ageing panasonic PABX that is capable of feedi9ng either
straight POTS or digital p[hones.

To feed a POTS its uses two wire extenbsion cabling and a master socket
with ring cap.

To feed digital phones it uses 4 wires.

Ive now acquired a bargian bundle of panasonic digital phones for it,
but of course they don't currently work.

My question is this: is it possible to wire the BT sockets so as to be
able to accept either phone? The signal wires are identical, the digital
just adds two more wires to the other two terminals BUT one of those has
the ring cap on it currently.

Its probably not a disater if I have to cut those out...but it would be
nice to be able to plug either phone in and have it work.

Do modern phones need the ring cap?

Not normally. Historic phones do. Putting a cap inside a phone now costs less than dealing with customer returns.


NT

On 05/10/2018 09:48, The Natural Philosopher wrote:


I have an ageing panasonic PABX that is capable of feedi9ng either
straight POTSÂ* or digital p[hones.

To feed a POTS its uses two wire extenbsion cabling and a master socket
with ring cap.

To feed digital phones it uses 4 wires.

Ive now acquired a bargian bundle of panasonic digital phones for it,
but of course they don't currently work.

My question is this: is it possible to wire the BT sockets so as to be
able to accept either phone? The signal wires are identical, the digital
just adds two more wires to the other two terminals BUT one of those has
the ring cap on it currently.

One way of doing this in a structured wiring environment is to use a
RJ45 faceplate socket, and plug the digital phone straight in, and then
use a Line Adaptor Unit with built in ring cap and traditional BT socket
on it for the phones. The ones I use look like:

http://wiki.diyfaq.org.uk/index.php/...stem#Telephony

Its probably not a disater if I have to cut those out...but it would be
nice to be able to plug either phone in and have it work.

Do modern phones need the ring cap?

Many don't but some still do.


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On 05/10/2018 11:06, T i m wrote:
On Fri, 5 Oct 2018 02:16:44 -0700 (PDT), wrote:

On Friday, 5 October 2018 09:48:44 UTC+1, The Natural Philosopher wrote:

Do modern phones need the ring cap?



Back OT, our 1x5 PABX can support LD and MF dialling and has a std BT
(master) socket on the end of each extension. We do still have one LD
phone (on a very old Telephone Alarm Clock Radio) but because it's on
it's own line, don't have any bell tinkle or ringing issues.

Cheers, T i m



When I had four teenage kids living at home I put in a (recycled) PABX
and, in the end, a second phone line exclusively for the kids. The
mobile phone generation just don't know how lucky they are.

On Fri, 5 Oct 2018 15:34:43 +0100, newshound
wrote:

On 05/10/2018 11:06, T i m wrote:
On Fri, 5 Oct 2018 02:16:44 -0700 (PDT), wrote:

On Friday, 5 October 2018 09:48:44 UTC+1, The Natural Philosopher wrote:

Do modern phones need the ring cap?



Back OT, our 1x5 PABX can support LD and MF dialling and has a std BT
(master) socket on the end of each extension. We do still have one LD
phone (on a very old Telephone Alarm Clock Radio) but because it's on
it's own line, don't have any bell tinkle or ringing issues.


When I had four teenage kids living at home I put in a (recycled) PABX
and, in the end, a second phone line exclusively for the kids.

I did similar ... first the PABX (to stop people interrupting my modem
downloads) and then the second line for data as I think I got it
cheaper (and the kids fought for the other line though the PABX). ;-)

The
mobile phone generation just don't know how lucky they are.

When we got our first mobile phone (Mercury M300 on One 2 One) I think
I remember it coming with free local calls, evenings and weekends.

Come 6pm the kids would come and get the mobile and only re-appear for
replacement batteries from the charger. ;-)

Cheers, T i m

On 05/10/18 12:11, wrote:
On Friday, 5 October 2018 09:48:44 UTC+1, The Natural Philosopher wrote:
My question is this: is it possible to wire the BT sockets so as to be
able to accept either phone? The signal wires are identical, the digital
just adds two more wires to the other two terminals BUT one of those has
the ring cap on it currently.

Possibly. The problem is that a 3-wire phone (as well as needing the ring cap in a master socket) will cause a short between the data wire on 3 and the B line wire on 5.

I've used LJ4 sockets, cut out the bell capacitor and out of circuit resistor on the proprietary phone, so I can use either a proprietary phone or a standard phone (or both in parallel) on a KX-TA system.

http://wiki.diyfaq.org.uk/index.php/...-wiring-UK.JPG

The latest version "digital" keyphones won't work on the older version "hybrid" systems so that might also be the problem

Owain

Thanks m8. Its a pana KX-TA 64 pabx and the phones are 7750s and a 7730
I think.

Its prolly no big deal if I cant use standard phones

--
€œThe fundamental cause of the trouble in the modern world today is that
the stupid are cocksure while the intelligent are full of doubt."

- Bertrand Russell

On 05/10/2018 09:48, The Natural Philosopher wrote:


I have an ageing panasonic PABX that is capable of feedi9ng either
straight POTS or digital p[hones.

To feed a POTS its uses two wire extenbsion cabling and a master socket
with ring cap.

To feed digital phones it uses 4 wires.

Ive now acquired a bargian bundle of panasonic digital phones for it,
but of course they don't currently work.

My question is this: is it possible to wire the BT sockets so as to be
able to accept either phone? The signal wires are identical, the digital
just adds two more wires to the other two terminals BUT one of those has
the ring cap on it currently.

Its probably not a disater if I have to cut those out...but it would be
nice to be able to plug either phone in and have it work.

Do modern phones need the ring cap?






Very few. Remove the third wire, and wire it for digital. If you have
the odd analog phone which doesn't have a built-in ring capacitor,
connect it via an ADSL filter - whose PSTN outlet socket *does* have a
ring capacitor.
--
Cheers,
Roger
____________
Please reply to Newsgroup. Whilst email address is valid, it is seldom
checked.

On 05/10/2018 16:01, T i m wrote:
On Fri, 5 Oct 2018 15:34:43 +0100, newshound
wrote:

On 05/10/2018 11:06, T i m wrote:
On Fri, 5 Oct 2018 02:16:44 -0700 (PDT), wrote:

On Friday, 5 October 2018 09:48:44 UTC+1, The Natural Philosopher wrote:

Do modern phones need the ring cap?



Back OT, our 1x5 PABX can support LD and MF dialling and has a std BT
(master) socket on the end of each extension. We do still have one LD
phone (on a very old Telephone Alarm Clock Radio) but because it's on
it's own line, don't have any bell tinkle or ringing issues.


When I had four teenage kids living at home I put in a (recycled) PABX
and, in the end, a second phone line exclusively for the kids.

I did similar ... first the PABX (to stop people interrupting my modem
downloads) and then the second line for data as I think I got it
cheaper (and the kids fought for the other line though the PABX). ;-)

The
mobile phone generation just don't know how lucky they are.

When we got our first mobile phone (Mercury M300 on One 2 One) I think
I remember it coming with free local calls, evenings and weekends.

My first mobile was on Orange (a Motorola MR20 IIRC) and came with a
grand total of 15 minutes per month in the contract!

And the standard battery lasted about 8 hours on standby, while the
extended one (twice as thick) lasted about 15!

SteveW

On Fri, 5 Oct 2018 22:04:37 +0100, Steve Walker
wrote:

snip

My first mobile was on Orange (a Motorola MR20 IIRC) and came with a
grand total of 15 minutes per month in the contract!

And I bet you made them last. You weren't walking along (appearing to
be ) talking to yourself? ;-)

And the standard battery lasted about 8 hours on standby, while the
extended one (twice as thick) lasted about 15!

I was going to say it's amazing how such things have progressed bit
I'm not sure they have, not really?

The problem is, rather than using the improved battery technology to
allow a phone to stay charged for a month, we improve the performance
and features to a point where we consume the battery in 8 hours still.
;-(

Cheers, T i m

On 05/10/18 20:44, Roger Mills wrote:
On 05/10/2018 09:48, The Natural Philosopher wrote:


I have an ageing panasonic PABX that is capable of feedi9ng either
straight POTS or digital p[hones.

To feed a POTS its uses two wire extenbsion cabling and a master socket
with ring cap.

To feed digital phones it uses 4 wires.

Ive now acquired a bargian bundle of panasonic digital phones for it,
but of course they don't currently work.

My question is this: is it possible to wire the BT sockets so as to be
able to accept either phone? The signal wires are identical, the digital
just adds two more wires to the other two terminals BUT one of those has
the ring cap on it currently.

Its probably not a disater if I have to cut those out...but it would be
nice to be able to plug either phone in and have it work.

Do modern phones need the ring cap?






Very few. Remove the third wire, and wire it for digital. If you have
the odd analog phone which doesn't have a built-in ring capacitor,
connect it via an ADSL filter - whose PSTN outlet socket *does* have a
ring capacitor.

This sounds like a plan.


--
No Apple devices were knowingly used in the preparation of this post.

On 06/10/2018 00:29, T i m wrote:
On Fri, 5 Oct 2018 22:04:37 +0100, Steve Walker
wrote:

snip

My first mobile was on Orange (a Motorola MR20 IIRC) and came with a
grand total of 15 minutes per month in the contract!

And I bet you made them last. You weren't walking along (appearing to
be ) talking to yourself? ;-)

And the standard battery lasted about 8 hours on standby, while the
extended one (twice as thick) lasted about 15!

I was going to say it's amazing how such things have progressed bit
I'm not sure they have, not really?

The problem is, rather than using the improved battery technology to
allow a phone to stay charged for a month, we improve the performance
and features to a point where we consume the battery in 8 hours still.
;-(

Cheers, T i m

I'm glad to say that my five year old phone (I must upgrade soon as the
memory is getting a bit limiting) allows me to make calls, use apps,
browse the web, etc. and still gets 24 hours out of a charge.

SteveW