1 Aug
2016
1 Aug
'16
10:03 a.m.
On 08/01/2016 12:48 PM, Ivan Avery Frey via talk wrote:
One does need a small filter to prevent the DSL signals from interfering with the use of the telephone link.
Actually, it's the other way around. The filter keeps the phone from interfering with the ADSL signal. ADSL uses frequencies that are well beyond the range a phone is capable of reproducing and well above hearing.
From https://en.wikipedia.org/wiki/Asymmetric_digital_subscriber_line "26.075 kHz <https://en.wikipedia.org/wiki/KHz> to 137.825 kHz is used for upstream communication, while 138 kHz – 1104 kHz is used for downstream communication"
The ADSL filter is a low pass device, which keeps the telephone set from affecting the ADSL signal: https://en.wikipedia.org/wiki/DSL_filter