Doctor Olds
I Need A Remedy For What's Ailing Me.
Premium,VIP
join:2001-04-19
1970 442 W30
clubs:
| reply to pcn
Re: Occasional Sync loss
Even if you could "shield the device" the majority of interference comes in over the actual wires. You would have to shield up to 3.5 miles of wire from the residence all the way back to the Remote or Central Office. I've seen the wrong type of phone line or even a too long extension line between the wall jack and the DSL Modem cause very high interference to the DSL Signal and replacing the flat wire with UTP wire fixed the issue.
Also there must be no noise on the line, if you have static, popping, clicks, hums, rumbles, whistles, warbling, flutter, or even AM Radio stations heard over the phone line that will interfere with the DSL making it very unstable until it is repaired., The phone line should be "pin drop" quiet.
The DSL Modem must not transmit harmful interference and it must accept all harmful transmissions around it.
FCC Part 15 Subpart B Devices.
»www.cclab.com/fcc-part-15.htm
quote:
FCC Part 15 Subpart B is for unintentional radiators. The category of unintentional radiators includes a wide variety of devices that contain clocks or oscillators and logic circuitry but that do not deliberately generate radio frequencies emissions. Among the common unintentional radiators are personal computers, peripherals, receivers, radios, TV sets, and cable TV home terminals. FCC Part 15 Section 15.101 has a very informative table for unintentional radiators. Two levels of radiation and conducted emissions limits for unintentional radiators are specified in FCC Part 15 Subpart B. The two levels are Class A digital devices, the higher less strict limits, and Class B digital devices, the lower more strict limits. Manufacturers are encouraged to meet the Class B digital device limits.
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What’s the point of owning a supercar if you can’t scare yourself stupid from time to time? |
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pcn
join:2009-06-01
Fort Collins, CO
| reply to Doctor Olds
Thanks for the reply.
My resync count is up over 190 now.
It seems that I get troubles in maybe periods of 45 minutes or less, and then things settle down for many hours (or even weeks). So, unless I can get a time of failure sufficiently long so that I can verify no problem at the NID, and problems inside, it will be hard to learn anything that way.
Has nobody ever had any luck shielding their device to get around some of these issues? |
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Doctor Olds
I Need A Remedy For What's Ailing Me.
Premium,VIP
join:2001-04-19
1970 442 W30
clubs:
1 edit | reply to pcn
It is highly unlikely that a neighbor's house is causing your DSL to lose sync (BTW, that is an impressive Resync Count of 85 times as I don't recall such a high number any time in the last couple Years or more) unless they are a HAM Operator with a 100 foot radio tower in their back or side yard (or a Pirate AM Radio Station in their basement).
I suggest testing at the NID to see if you are still losing DSL Sync or not.
»EarthLink DSL FAQ »How do I test at my NID? What does it look like?
If the DSL still loses sync while at the NID then it is a problem outside from the NID back to the DSLAM at Remote or the CO. If there is no more sync loss then it is your inside wiring or and electronic and/or electrical device in your residence likely causing the loss of sync.
»SBC DSL FAQ »RF Interference troubleshooting
»Ameritech - SBC FAQ »My DSL loses sync regularly. How can I detect interference with an AM Radio?
HTH
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What’s the point of owning a supercar if you can’t scare yourself stupid from time to time? |
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pcn
join:2009-06-01
Fort Collins, CO
|  I've had Earthlink DSL for about 4 years now. Most of the time, things work well. In the last few weeks, however, I've been noticing periods of time when my modem will not hold sync. It keeps connecting, PPPoE comes up, and then shortly everything resets. This may last 45 minutes, or a few hours, and then everything is stable again.
I've read on this forum that DSL is susceptible to noise from other sources. I can't tie this to anything in my house, so I'm assuming it comes in from a neighbor's house.
What can be done to shield my modem from this noise? I'd prefer not to bug my neighbors about this. Does the noise come in by the power line? phone line? radiated?
I've got a Netopia modem and the latest statistics are as follows:
ADSL Connection Up
Resync Count: 85
Channel: INTERLEAVE
ADSL Mode: G.DMT
Downstream info:
Bit Rate: 1536 Kbps
Capacity Occupation: 26 %
Noise Margin: 39.44 dB
Attenuation: 9.64 dB
Output Power: 11.73 dBm
Upstream info:
Bit Rate: 576 Kbps
Capacity Occupation: 100 %
Noise Margin: 6.00 dB
Attenuation: 10.00 dB
Output Power: 12.50 dBm |
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