| Author |
Message |
Don Taylor
Guest
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 Posted:
Tue Feb 08, 2005 8:40 am Post subject:
Any way to cut telephone crosstalk? |
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Wall jack, 4 foot cord, internal modem, 4 foot cord, telephone.
If it is a "newer" phone, the 6 ounce plastic pushbutton kind,
I pick up the handset, dial 1 and listen there is LOUD crosstalk.
If I unplug that and go dig out my ancient old ITT bell rotary 3 pound
desk phone from decades ago and try the same there is NO crosstalk.
(And I think this might be contributing to noise with the modem,
loss of connections now and then, etc)
Any bright ideas about what I might to combat some of this?
Use the cord to make a wrap or two around a ferrite torroid?
Anything else? (cheap new phone is line powered, not wall powered)
Thanks
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Jerry G.
Guest
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| Posted:
Tue Feb 08, 2005 8:02 pm Post subject:
Re: Any way to cut telephone crosstalk? |
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The only thing I can think of, is that your phone is not wired correctly, or
does not meet proper standards for your telephone company.
Is this a phone that is approved by your telephone company? Or, is this one
of these cheap bargain phones?
--
Jerry G.
=====
"Don Taylor" <dont@agora.rdrop.com> wrote in message
news:xf2dnQ2gQqbRxJXfRVn-tQ@scnresearch.com...
Wall jack, 4 foot cord, internal modem, 4 foot cord, telephone.
If it is a "newer" phone, the 6 ounce plastic pushbutton kind,
I pick up the handset, dial 1 and listen there is LOUD crosstalk.
If I unplug that and go dig out my ancient old ITT bell rotary 3 pound
desk phone from decades ago and try the same there is NO crosstalk.
(And I think this might be contributing to noise with the modem,
loss of connections now and then, etc)
Any bright ideas about what I might to combat some of this?
Use the cord to make a wrap or two around a ferrite torroid?
Anything else? (cheap new phone is line powered, not wall powered)
Thanks |
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CWatters
Guest
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| Posted:
Tue Feb 08, 2005 9:06 pm Post subject:
Re: Any way to cut telephone crosstalk? |
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"Don Taylor" <dont@agora.rdrop.com> wrote in message
news:xf2dnQ2gQqbRxJXfRVn-tQ@scnresearch.com...
| Quote: | Wall jack, 4 foot cord, internal modem, 4 foot cord, telephone.
If it is a "newer" phone, the 6 ounce plastic pushbutton kind,
I pick up the handset, dial 1 and listen there is LOUD crosstalk.
|
If you call someone with this handset can they hear the cross talk as well?
eg is it really cross talk or just a noisy on your handset speaker?
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Ken Taylor
Guest
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| Posted:
Wed Feb 09, 2005 12:07 am Post subject:
Re: Any way to cut telephone crosstalk? |
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"Don Taylor" <dont@agora.rdrop.com> wrote in message
news:xf2dnQ2gQqbRxJXfRVn-tQ@scnresearch.com...
| Quote: | Wall jack, 4 foot cord, internal modem, 4 foot cord, telephone.
If it is a "newer" phone, the 6 ounce plastic pushbutton kind,
I pick up the handset, dial 1 and listen there is LOUD crosstalk.
If I unplug that and go dig out my ancient old ITT bell rotary 3 pound
desk phone from decades ago and try the same there is NO crosstalk.
(And I think this might be contributing to noise with the modem,
loss of connections now and then, etc)
Any bright ideas about what I might to combat some of this?
Use the cord to make a wrap or two around a ferrite torroid?
Anything else? (cheap new phone is line powered, not wall powered)
Thanks
|
When you say 'cross-talk', is it other people's conversations or echoes?
Does it happen with handset plugged straight into the wall jack? Are there
any other extension sockets on your line in your house?
Ken |
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Don Taylor
Guest
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| Posted:
Wed Feb 09, 2005 12:17 am Post subject:
Re: Any way to cut telephone crosstalk? |
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"CWatters" <colin.watters@pandoraBOX.be> writes:
| Quote: | "Don Taylor" <dont@agora.rdrop.com> wrote in message
news:xf2dnQ2gQqbRxJXfRVn-tQ@scnresearch.com...
Wall jack, 4 foot cord, internal modem, 4 foot cord, telephone.
If it is a "newer" phone, the 6 ounce plastic pushbutton kind,
I pick up the handset, dial 1 and listen there is LOUD crosstalk.
If you call someone with this handset can they hear the cross talk as well?
eg is it really cross talk or just a noisy on your handset speaker?
|
They can hear it too but not at a lower volume than here
And I loved the comment about whether this was a certified phone or not.
When was the last time your phone company came out and did product
certification? |
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CWatters
Guest
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| Posted:
Wed Feb 09, 2005 4:13 am Post subject:
Re: Any way to cut telephone crosstalk? |
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"Don Taylor" <dont@agora.rdrop.com> wrote in message
news:g_-dndAvfaGvn5TfRVn-oQ@scnresearch.com...
| Quote: | And I loved the comment about whether this was a certified phone or not.
When was the last time your phone company came out and did product
certification?
|
Many countries have a certification scheme. In the UK telecoms products used
to (still?) carry a green triangle or a red circle lable to indicate
compliance with that scheme. |
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Dbowey
Guest
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| Posted:
Wed Feb 09, 2005 5:35 am Post subject:
Re: Any way to cut telephone crosstalk? |
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dont posted:
<< They can hear it too but not at a lower volume than here
What is "it?" Static, echo, CB radio, AM broadcast radio, buzz, hum, etc.
Until we know that, there is no realistic way to sort out what is the problem.
<< And I loved the comment about whether this was a certified phone or not.
When was the last time your phone company came out and did product
certification?
Whether or not it is Certified may give a clue to the problem. I'm sure the
person who posted the question is glad you enjoyed the question. If you are so
smugly smart why did you post your cross-talk problem? |
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petrus bitbyter
Guest
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| Posted:
Wed Feb 09, 2005 6:34 am Post subject:
Re: Any way to cut telephone crosstalk? |
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"Don Taylor" <dont@agora.rdrop.com> schreef in bericht
news:xf2dnQ2gQqbRxJXfRVn-tQ@scnresearch.com...
| Quote: | Wall jack, 4 foot cord, internal modem, 4 foot cord, telephone.
If it is a "newer" phone, the 6 ounce plastic pushbutton kind,
I pick up the handset, dial 1 and listen there is LOUD crosstalk.
If I unplug that and go dig out my ancient old ITT bell rotary 3 pound
desk phone from decades ago and try the same there is NO crosstalk.
(And I think this might be contributing to noise with the modem,
loss of connections now and then, etc)
Any bright ideas about what I might to combat some of this?
Use the cord to make a wrap or two around a ferrite torroid?
Anything else? (cheap new phone is line powered, not wall powered)
Thanks
|
Crosstalk is about unwanted signal transfer between two (telephone)lines, so
two sets of wires. So what other line do you hear after dialing that 1?
Can't imagine crosstalk in the last 4 foot cord where you are the only user.
So what do you hear? Yourself? Then most likely the antilocalcircuit in your
phone is broken. The old machines used transformers that are almost
undestructable but the new electronic circuits are more sensitive. Other
possibilties are wrong wiring and bad contacts.
Do you achieve the same result if you keep the modemcard out? Then the above
stands. If not, you have to look for more precisely for bad contacts between
phone and modem. That RJxx jackets sometimes get lame contacts. The plug
also can be damaged. I met both cases several times.
If you really hear another line, it's almost sure the impedance matching
between line and phone is very bad. Most likely some circuit in the phone
became defective although wrong wiring and bad contacts are also a possible
cause (as always).
petrus bitbyter |
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Don Taylor
Guest
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| Posted:
Wed Feb 09, 2005 8:40 am Post subject:
Re: Any way to cut telephone crosstalk? |
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"Ken Taylor" <ken123@xtra.co.nz> writes:
| Quote: | "Don Taylor" <dont@agora.rdrop.com> wrote in message
news:xf2dnQ2gQqbRxJXfRVn-tQ@scnresearch.com...
Wall jack, 4 foot cord, internal modem, 4 foot cord, telephone.
If it is a "newer" phone, the 6 ounce plastic pushbutton kind,
I pick up the handset, dial 1 and listen there is LOUD crosstalk.
If I unplug that and go dig out my ancient old ITT bell rotary 3 pound
desk phone from decades ago and try the same there is NO crosstalk.
....
When you say 'cross-talk', is it other people's conversations or echoes?
|
Conversations
| Quote: | Does it happen with handset plugged straight into the wall jack?
|
Yes, and even when I try it outside at the terminal block.
| Quote: | Are there any other extension sockets on your line in your house?
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No |
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Don Taylor
Guest
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| Posted:
Wed Feb 09, 2005 8:40 am Post subject:
Re: Any way to cut telephone crosstalk? |
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"CWatters" <colin.watters@pandoraBOX.be> writes:
| Quote: | "Don Taylor" <dont@agora.rdrop.com> wrote in message
news:g_-dndAvfaGvn5TfRVn-oQ@scnresearch.com...
And I loved the comment about whether this was a certified phone or not.
When was the last time your phone company came out and did product
certification?
Many countries have a certification scheme. In the UK telecoms products used
to (still?) carry a green triangle or a red circle lable to indicate
compliance with that scheme.
|
I don't mean to be sarcastic about this but when AT&T sells itself
and all the providers in the country seem to have realized that
they can make LOTS more money trading cell phone contracts than they
can making telephones... I suspect whoever might be left in the little
office somewhere who's job it was to certify compliance just might
have turned out the light and been outsourced without anybody noticing. |
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Don Taylor
Guest
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| Posted:
Wed Feb 09, 2005 8:40 am Post subject:
Re: Any way to cut telephone crosstalk? |
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dbowey@aol.com (Dbowey) writes:
| Quote: | dont posted:
They can hear it too but not at a lower volume than here
What is "it?" Static, echo, CB radio, AM broadcast radio, buzz, hum, etc.
Until we know that, there is no realistic way to sort out what is the problem.
|
I was answering the question I was asked, "can the person on the other
end of the phone hear this same conversation that I'm hearing or is
it strictly limited to my end.
| Quote: | And I loved the comment about whether this was a certified phone or not.
When was the last time your phone company came out and did product
certification?
Whether or not it is Certified may give a clue to the problem. I'm sure the
person who posted the question is glad you enjoyed the question. If you are so
smugly smart why did you post your cross-talk problem?
|
Well, I was thinking someone might have a list of moderately simple
techniques that could kill the noise, I searched and didn't find
any such list, before I even asked the question.
Having now checked ALL the phones I have here and there the ONLY
certification I can see on any one of them is that a couple claim
they comply with Part 68, which if I remember correctly is that
they aren't supposed to radiate enough to interfere with anything
else but unless I've forgotten Part 68 said nothing about a device
not being interfered WITH. (And the old "real AT&T phone" has a
ringer equivalency, but that seems like it went out of style about
the time AT&T lost the ruling against Dataphone and connecting
anything other than AT&T equipment to the line. I can remember
getting a letter from the phone company 30 years ago when they did
a ringer sweep of the town and sent warning letters to everyone who
had a greater load than the number of phones they were paying for.)
So what's the certification ruling about phones not being subject
to cross talk? I 'm curious. We've got a federal documents
repository downtown and I'll go look it up.
Thank you |
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Don Taylor
Guest
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| Posted:
Wed Feb 09, 2005 8:40 am Post subject:
Re: Any way to cut telephone crosstalk? |
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"petrus bitbyter" <p.kralt@reducespamforchello.nl> writes:
| Quote: | "Don Taylor" <dont@agora.rdrop.com> schreef in bericht
news:xf2dnQ2gQqbRxJXfRVn-tQ@scnresearch.com...
Wall jack, 4 foot cord, internal modem, 4 foot cord, telephone.
If it is a "newer" phone, the 6 ounce plastic pushbutton kind,
I pick up the handset, dial 1 and listen there is LOUD crosstalk.
If I unplug that and go dig out my ancient old ITT bell rotary 3 pound
desk phone from decades ago and try the same there is NO crosstalk.
Crosstalk is about unwanted signal transfer between two (telephone)lines, so
two sets of wires. So what other line do you hear after dialing that 1?
Can't imagine crosstalk in the last 4 foot cord where you are the only user.
So what do you hear? Yourself? Then most likely the antilocalcircuit in your
phone is broken. The old machines used transformers that are almost
undestructable but the new electronic circuits are more sensitive. Other
possibilties are wrong wiring and bad contacts.
|
Conversation from somewhere else, that was why I called it crosstalk
rather than echo. And as I said, identical results if I take the pair
of phones outside to the terminal block and repeat the experiment there
with no inside wiring, no modem, no computer.
| Quote: | Do you achieve the same result if you keep the modemcard out? Then the above
stands. If not, you have to look for more precisely for bad contacts between
phone and modem. That RJxx jackets sometimes get lame contacts. The plug
also can be damaged. I met both cases several times.
|
I've looked at jack and plug, both appear to be clean, not corroded,
not badly bent, pretty good looking to me.
| Quote: | If you really hear another line, it's almost sure the impedance matching
between line and phone is very bad. Most likely some circuit in the phone
became defective although wrong wiring and bad contacts are also a possible
cause (as always).
|
By eliminating all the inside wiring and the computer and everything
to the outside jack, and the problem persists, it seems like we are
getting closer to the problem. But I'm still not seeing any solution
other than going back to the 1970's Bell rotary desk phone, yet.
thanks |
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CWatters
Guest
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| Posted:
Wed Feb 09, 2005 2:53 pm Post subject:
Re: Any way to cut telephone crosstalk? |
|
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"Don Taylor" <dont@agora.rdrop.com> wrote in message
news:Pu6dnTfPK5c-IpTfRVn-vw@scnresearch.com...
| Quote: |
I don't mean to be sarcastic about this but when AT&T sells itself
and all the providers in the country seem to have realized that
they can make LOTS more money trading cell phone contracts than they
can making telephones... I suspect whoever might be left in the little
office somewhere who's job it was to certify compliance just might
have turned out the light and been outsourced without anybody noticing.
|
I might be wrong but I think it's been "self certification" in the UK for
some years. |
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CWatters
Guest
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| Posted:
Wed Feb 09, 2005 2:57 pm Post subject:
Re: Any way to cut telephone crosstalk? |
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If you get the same problem when you move the phone to another socket then
it sounds like the phone is faulty. Unless it's some fancy telephone I
would just trash it. |
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Noah Little
Guest
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| Posted:
Wed Feb 09, 2005 6:40 pm Post subject:
Re: Any way to cut telephone crosstalk? |
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Don Taylor wrote:
| Quote: | By eliminating all the inside wiring and the computer and everything
to the outside jack, and the problem persists, it seems like we are
getting closer to the problem. But I'm still not seeing any solution
other than going back to the 1970's Bell rotary desk phone, yet.
|
You've now given us information to know how to solve the problem: get
rid of the defective phone.
--
Noah |
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