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Sources of interference

Interference with Cables
Try to keep cables away from power outlets, flourescent lighting fixtures, uninterruptable power supplies, and other sources of strong electromagnetic interference. Coiling up cables can also cause interference.

Bouncing CPE
If the CPE is bouncing, take note of where it is located. If it's near any electric devices that may draw more current during certain times of the day, this could cause a "bounce". Examples of such devices include microwave ovens, floor heaters, and electric fans.

Additionally, noise induced 'radio' reception, an analog condition, may be present. When you move an AC extension cord, does the amount of noise received by a DSL system increase or decrease? If so, that extension cord may be a tuned part of the noise transmission system. This induced radio reception is similar to the reception of a distant radio station which changes during the course of the day.

Things that can interfere with DSL
Digital cable Alarm system Cordless Phones Splitters
Firewalls Fax machines Distinctive phone rings Halogen lamps
Security system Telephone jack networks Proxy Servers Satellite system
Things that can interfere with DSL Wireless Home Networking
Microwave ovens Telephone jack networks Power lines Power stations
Electrical railroad tracks 2.4 GHz phones Metal objects between computer and base station DSS RF leakage
Composition of walls Large bodies of water Large metal objects Computer too confining a space

 
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