There may be several types of DSL filters out there. Each may have a
different frequency response characteristic.
The original ADSL (Asymmetric Digital Subscriber Network) had a frequency
range starting at about 25kHz and ending at about 1.1MHz. The range from
25kHz to 138kHz is the "upstream" and from 138kHz to 1.1MHz is "downstream".
The wider bandwidth for the downstream is designed for faster downloading,
since most people download more than they upload.
Now there are DSL types that extend to 2.2MHz (ADSL2+), 4.4MHz (ADSL2++),
12MHz (VDSL) and as high as 30MHz (VDSL2). There are also variations that
may end at some other frequencies between 1.1MHz and 30MHz depending on the
local service.
The phone frequencies (called "POTS" - Plain Old Telephone Service) range
from DC to about 3400Hz. The DC signals include the "ringing" voltage.
Signals in the ranges above (voice from DC to 3.4kHz and DSL from 25kHz to
up to 30MHz) may be present on the twisted-pair telephone cables from the
Central Office to the home (called the "local loop").
73,
John W2XS
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