bsdaiwa
join:2004-06-04
Fullerton, CA | Stumped by ADSL Signal I am at my wits end on this one and could really use some help. First, I am in southern Brazil and my telephone provider is Oi (formerly Brazil Telecom). I have voice and ADSL setup in the house and all worked well until a few weeks ago. My voice line suddenly had a great deal of static but the ADLS worked fine. Oi sent someone to fix the issue and after attaching his phone to the point where the line entered the house, he determined it was my wiring or devices.
Since that time I have tested everything and can find no faults except the following. When I attach a phone to the line coming into the house all is fine, when I put the filter on the line to split it for voice and ADSL and do not plug in the modem to the splitter, the voice is fine. But, when I attach the modem to the splitter and the DSL signal is “caught” the static begins. If I disconnect the filter from the inbound line and then disconnect the modem from the splitter and then reconnect the splitter with only the voice line attached, no static. If I connect the modem to the splitter, leaving the power off, and wait 30 to 60 seconds, no static. But, if I turn the modem and the signal is caught, then static. It seems to me that when the DSL signal is active the static starts.
I have tried four (4) different splitters and four (4) different modems and the results are the same.
Does anyone have any ideas what might be going on here?
Thanks to anyone who can help. |
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| If the outside access (demark) has a phone jack take a phone and plug it into it. Then dial one digit, not an entire number, and see if the line is static free. If there is static have the phone company fix it.
If there is no static in the above test, remove the phone and plug in a splitter/modem/phone into the outside jack. Power on the modem and then do the above test again. If the phone line is still static free then the problem is indeed with the wiring after the demark, usually inside the house but sometimes inside the demark itself where the internal wiring gets attached to it.
If static does begin when you plug the test setup into the outside demark then it is time to call the phone company back and have them come to the site and work the problem until the static is gone. |
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bsdaiwa
join:2004-06-04
Fullerton, CA | said by BlueMist:If the outside access (demark) has a phone jack take a phone and plug it into it. Then dial one digit, not an entire number, and see if the line is static free. If there is static have the phone company fix it.
If there is no static in the above test, remove the phone and plug in a splitter/modem/phone into the outside jack. Power on the modem and then do the above test again. If the phone line is still static free then the problem is indeed with the wiring after the demark, usually inside the house but sometimes inside the demark itself where the internal wiring gets attached to it.
If static does begin when you plug the test setup into the outside demark then it is time to call the phone company back and have them come to the site and work the problem until the static is gone.
Plugged phone into demark, dialed one digit, no static. Removed phone and plugged in splitter/modem/phone into the outside jack. Powered on modem, dialed one digit and got static.
Time to call the telephone company. |
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 dib22
join:2002-01-27
Kansas City, MO
kudos:2 | said by bsdaiwa:Plugged phone into demark, dialed one digit, no static. Removed phone and plugged in splitter/modem/phone into the outside jack. Powered on modem, dialed one digit and got static.
Time to call the telephone company.
Yup if its happening at the demarc it's not your wiring... but... I am now wondering if its the modem or the splitters at fault? Wonder if you got a bad batch of splitters that all failed at the same time? Did you have lightning storm before this happened?
Do you own the modem, or is it provided by them? If you own might grab another to eliminate it being your modem. |
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 John GaltForward, MarchPremium
join:2004-09-30
Happy Camp
kudos:5 | reply to bsdaiwa
Your local mice-children might have been snacking on your delicious wiring, too. |
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bsdaiwa
join:2004-06-04
Fullerton, CA | reply to dib22
Tried four (4) different splitters all from different manufactures and three (3) different modems all from different manufactures and the results are the same, static.
Living in Brazil part of the year you lean to bring multiple brand name backups. |
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bsdaiwa
join:2004-06-04
Fullerton, CA | reply to John Galt
Maybe, but line into the house from pole across the street is underground and unless we have gophers I don't think its the wiring. |
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dib22
join:2002-01-27
Kansas City, MO
kudos:2 | reply to bsdaiwa
Just to clarify at the demarc you put a splitter
you placed the modem on one leg
you placed a filter on the other leg, and you plugged the phone into the filter
Is that correct? |
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bsdaiwa
join:2004-06-04
Fullerton, CA | At the demarc I attached a splitter that has two ports, one marked for the phone and one marked for the modem. I plugged the phone into the phone port and the modem into the modem port.
Two of the splitters were supplied by telephone companies (Brasil Telecom and Telefonica) and one I purchased in the US. Here is a link to the one I rely on and it was one of the units I used in test.
»wilcominc.com/Item.cfm?ProdID=100
And just to add, I tested the phone, modem and splitters at another location that has the same service as I do and they all worked fine. |
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bsdaiwa
join:2004-06-04
Fullerton, CA | reply to bsdaiwa
Would this information from the modem help in the analysis? I don't know how to interpret it, so I don't know if its good or bad.
------------Downstream Upstream
SNR Margin: 22.2 10.7 db
Line Attenuation: 16.9 13.6 db
Data Rate: 11328 575 kbps |
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dib22
join:2002-01-27
Kansas City, MO
kudos:2 | reply to bsdaiwa
Well I am stumped as well!
I generally never use a filter on the modem side, just the phone side. I tend to run a separate line from the demarc to the modem, then just filter the entire voice side at the demarc panel if I can.
Please update here if you solve it! |
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bsdaiwa
join:2004-06-04
Fullerton, CA | said by dib22:Well I am stumped as well!
I generally never use a filter on the modem side, just the phone side. I tend to run a separate line from the demarc to the modem, then just filter the entire voice side at the demarc panel if I can.
Please update here if you solve it!
Your comment got me thinking so I tried this. Using my Wicom PS-15 splitter, (»wilcominc.com/Item.cfm?ProdID=35) I attached a micro filter to the phone port to see if that eliminated the static, but it did not.
I wish I knew more about the telephone system because I think that the problem is in the company’s network. The local repairman has a very limited skill set so I need to be able to explain in great detail where I think the problem is. That would allow him to go to his supervisor and escalate the issue. The local repair man’s test equipment consists of an old telephone with alligator clips on the ends of the lines. I have to loan him my toner and tone probe.
Will update when and if I get this solved but it may take awhile, I am returning to the US next month and won't be back in Brazil until September. |
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 tschmidtPremium,MVM
join:2000-11-12
Milford, NH
kudos:8
 ·G4 Communications
·Fairpoint Commun..
 ·Hollis Hosting
| reply to bsdaiwa
said by bsdaiwa:Plugged phone into demark, dialed one digit, no static. Removed phone and plugged in splitter/modem/phone into the outside jack. Powered on modem, dialed one digit and got static.
Just to make sure I understand exactly what you did. You plugged POTS/DSL splitter into the Demarc test jack. Assuming this works the same as in the US this disconnects inside wiring.
With the splitter plugged into the Demarc plugged in powered up modem, and phone to the splitter and still had noise on the phone line.
If that is what you did then you have eliminated inside wiring/equipment as the source of the problem. As you surmise this is a phone company problem.
The Central Office uses filters for the same reason they are used at customer - to isolate high frequency DSL tones from voice. In your case most likely one of two possibilities:
1) Bad filter at the Central Office
2) Line is unbalanced making the filter ineffective.
Should be easy for your phone company to correct the problem.
/tom |
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bsdaiwa
join:2004-06-04
Fullerton, CA
1 edit | said by tschmidt:Just to make sure I understand exactly what you did. You plugged POTS/DSL splitter into the Demarc test jack. Assuming this works the same as in the US this disconnects inside wiring.
With the splitter plugged into the Demarc plugged in powered up modem, and phone to the splitter and still had noise on the phone line.
Yes, you are correct, I did everything you said and that's why I too, thought it was a phone company problem. I just hope I can get the phone guy to understand it.
Just to add claification, in Brazil they don't use a Demarc, they simply run the wiring into the house and then from jack to jack. I redid it and put a wall mounted RJ11 terminal box so I could trouble shoot and then ran wiring to the rest of the house. I put a RJ11 jack on the lead into the rest of the house so I could discontent it when I trouble shoot.
Thanks for your help. |
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| I have one last thought on this. I have had similar problems where the static only showed up when I had more than one extension phone plugged in and off the hook at the same time, as in two people in different rooms on the same call. It was tracked down to a loose connection up on a pole somewhere that was breaking down based on the current load.
Try eliminating all filters and plug in two phones and put one off hook and dial one number and leaving that phone as is, go to the second extension and pick it up and see if the static starts. Note, no DSL filter or modem is plugged in during this test, just the two phones. As in the other tests the line should be silent with no static.
If hopefully you get the static to start up with this test it might help the telephone repair tech to understand what is happening and would point to a wiring problem between your house and the central office. If the static does not start up with the two phones off the hook it's anyone's guess as to what the fix will be in the end. Good luck. |
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