| Author |
telephone line levels
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| HarryHydro 2005-09-16, 4:21 pm |
| Hi Folks:
I'm having a problem getting fax machine to hear each other. I'm
beginning to think it's the CO. With a butt-set, I have 71mV AC RMS
for a dial tone. Isn't that weak? Isn't that something like -20dB?
The answer tone of the FAX is naturally even weaker..
Another note: Every phone I've used in this area (on this CO?) sounds
low to the other party but I hear myself WAY TOO LOUD!! I've swapped
phone around, no fix. It seems like their impedance is way off.. Does
that sound possible?
Thanks!
Harry
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| Igor The Terrible 2005-09-16, 11:21 pm |
| Did you check to see of the fax machine works on a known good line? Is
the outlet you are plugging into putting out 120 VAC?
Is this a residence and POTS issue?
If so, do this first: make sure you are getting about 48VDC @ approx.
25 mA at the ONI (on hook). Also check the polarity and make sure it
is right. Then do the same from the ONI to the jacks. IF everything is
as it should be and the problem is still exists, dial 611 and have the
tech run a test on your loop. (If you call during business hours,
chances are good you will get a human being.) If it tests out OK, I'd
say the fax machine would be suspect.
HarryHydro wrote:
> Hi Folks:
> I'm having a problem getting fax machine to hear each other. I'm
> beginning to think it's the CO. With a butt-set, I have 71mV AC RMS
> for a dial tone. Isn't that weak? Isn't that something like -20dB?
> The answer tone of the FAX is naturally even weaker..
>
> Another note: Every phone I've used in this area (on this CO?) sounds
> low to the other party but I hear myself WAY TOO LOUD!! I've swapped
> phone around, no fix. It seems like their impedance is way off.. Does
> that sound possible?
>
> Thanks!
> Harry
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| TimPerry 2005-09-17, 12:21 am |
|
"HarryHydro" <harryhydro@hotmail.com> wrote in message
news:1126897867.279405.203340@g44g2000cwa.googlegroups.com...
> Hi Folks:
> I'm having a problem getting fax machine to hear each other. I'm
> beginning to think it's the CO. With a butt-set, I have 71mV AC RMS
> for a dial tone. Isn't that weak? Isn't that something like -20dB?
> The answer tone of the FAX is naturally even weaker..
>
> Another note: Every phone I've used in this area (on this CO?) sounds
> low to the other party but I hear myself WAY TOO LOUD!!
the sidetone (the term for hearing youself) is not s function of the line
but of you phone.
I've swapped
> phone around, no fix. It seems like their impedance is way off.. Does
> that sound possible?
almost anything (problemwise) is possable with an analog phone line. first
step is to get it tested at your demarc (point where telco responsibility
ends and customer wireing takes over)
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| Igor The Terrible 2005-09-17, 10:21 am |
| Oh...sorry...ONI = Outside Network Interface a.k.a. demarc.
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|
| On 9/17/05 5:30 AM, in article
1126960235.468713.203770@g43g2000cwa.googlegroups.com, "Igor The Terrible"
<igor_the_terrible@mad.scientist.com> wrote:
> Oh...sorry...ONI = Outside Network Interface a.k.a. demarc.
>
I thought everyone learned that in kindergarten. :=)
Bill
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| Igor The Terrible 2005-09-17, 7:21 pm |
| Read some of the posts...you tell me...
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