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802.16d has never existed as a standard strictly. The standard  is  correctly   called  802.16- 2004.  However,  since this  standard is  frequently  called  802.        16d,  that term is also used in this article to assist readability.

802.16d has never existed as a standard strictly. The standard  is  correctly   called  802.16- 2004.  However,  since this  standard is  frequently  called  802.        16d,  that term is also used in this article to assist readability.