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Main distribution frame
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<p>In <a href="/facts/Telephony/2GwTTepw">telephony</a>, a main distribution frame (MDF or main frame) is a signal <a href="/facts/Distribution_frame/bU7NoeLA">distribution frame</a> for connecting equipment (<a href="/facts/Inside_plant/JHVwWuqo">inside plant</a>) to cables and <a href="/facts/Pair_gain/1175E1Rf">subscriber carrier</a> equipment (<a href="/facts/Outside_plant/p3Y70bUe">outside plant</a>). </p>