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<PAGE>
EXHIBIT 23.1
CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
As independent public accountants, we hereby consent to the
incorporation by reference in this registration statement of our reports dated
March 16, 2000, included in Nx Networks, Inc.'s Form 10-K for the year ended
December 31, 1999, and to all references to our Firm included in this
registration statement.
/s/ Arthur Andersen LLP
Vienna, Virginia
January 15, 2001
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