A Media Filter actually in the real world may have two separate purposes. One is to connect Token Ring networks expecting STP (Shielded Twisted Pair), in a building that is wired with UTP (Unshielded Twisted Pair).
The second purpose is to connect ADSL Internet connections. Since both voice traffic and digital traffic is carried on one copper pair, the media filter blocks the higher frequency digital signals from entering phone equipment, effectively isolating the phone traffic and the DSL data traffic from each other.
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