EXHIBIT 99(f)


                    CONSENT OF THOMAS WEISEL PARTNERS LLC

   We hereby consent to (i) the inclusion of our opinion letter, dated October
29, 2001, to the Board of Directors of NetSilicon, Inc. (the "Company") as Annex
F to the Proxy Statement/Prospectus of the Company and Digi International Inc.
("Digi") relating to the merger between the Company and Digi and (ii) all
references to Thomas Weisel Partners LLC in the sections captioned "THE MERGER -
Background of the Merger" and "THE MERGER - Opinion of Financial Advisor to
NetSilicon", of the Proxy Statement/Prospectus which forms a part of this
Registration Statement on Form S-4. In giving such consent, we do not admit that
we come within the category of persons whose consent is required under, and we
do not admit that we are "experts" for purposes of, the Securities Act of 1933,
as amended, and the rules and regulations promulgated thereunder.


                                    /s/ THOMAS WEISEL PARTNERS LLC



                                    San Francisco, CA
                                    November 26, 2001