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Guard interval
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<p>In <a href="/facts/Telecommunications/vxoj1cxR">telecommunications</a>, guard intervals are used to ensure that <a href="/facts/Frame_(networking)/ltGCbJIq">distinct transmissions</a> do not interfere with one another, or otherwise cause <a href="/facts/Collision_(telecommunications)/GNMdlntV">overlapping transmissions</a>. These transmissions may belong to different users (as in <a href="/facts/Time-division_multiple_access/ue5UzN7B">TDMA</a>) or to the same user (as in <a href="/facts/Orthogonal_frequency-division_multiplexing/YhPkx5ql">OFDM</a>). </p><p>The purpose of the guard interval is to introduce immunity to <a href="/facts/Propagation_delay/tUcrAwwe">propagation delays</a>, echoes and reflections, to which digital data is normally very sensitive. </p>