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Reference.org
Virtual output queueing
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<p>Virtual output queueing (VOQ) is a technique used in certain <a href="/facts/Network_switch/CnvmhNYT">network switch</a> architectures where, rather than keeping all traffic in a single queue, separate queues are maintained for each possible output location. It addresses a common problem known as <a href="/facts/Head-of-line_blocking/jJ6X5ufJ">head-of-line blocking</a>. </p>