Doctor Olds
I Need A Remedy For What's Ailing Me.
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join:2001-04-19
1970 442 W30
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| 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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