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Reducing DSL Interference

November 13th Fact-of-the-Day

High-power transmitters often interfere with DSL (Digital Subscriber Line) Internet circuits. DSL routers and associated wiring obviously should be placed as far as possible from strong radio frequency fields to minimize interference. Ferrite beads at the entry points of power and phone wiring into a DSL router often help. An often overlooked problem is old residential phone wiring. Unused extension lines act as antennas to pickup more interference. Residential phones used to be wired with untwisted pairs. RF pickup can be reduced in some cases by replacing those old lines with twisted wire. The CAT5e cable commonly used for computer local area networks has four twisted pairs precisely laid to minimize stray coupling and is excellent multi-phone-line replacement wire. ©2004 Martek International All rights reserved. ©2004 Martek International All rights reserved.


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