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EXHIBIT 31.2

CERTIFICATIONS

I, Gregory T. Barnum, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Computer Network
Technology Corporation;

2. Based on my knowledge, this quarterly report does not contain any untrue
statement of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such statements
were made, not misleading with respect to the period covered by this quarterly
report;

3. Based on my knowledge, the financial statements, and other financial
information included in this quarterly report, fairly present in all material
respects the financial condition, results of operations and cash flows of the
registrant as of, and for, the periods presented in this quarterly report;

4. The registrants other certifying officers and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrants and we have:



| | a) |  | Designed such disclosure controls and procedures, or caused such
disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the
registrant, including its consolidated subsidiaries, is made known to
us by others within those entities, particularly during the period in
which this report is being prepared;
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| | b) |  | Evaluated the effectiveness of the registrants disclosure
controls and procedures and presented in this report our conclusions
about the effectiveness of the disclosure controls and procedures, as
of the end of the period covered by this report based on such
evaluations; and
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| | c) |  | Disclosed in this report any change in the registrants
internal control over financial reporting that occurred during the
registrants most recent fiscal quarter (the registrants fourth fiscal
quarter in the case of an annual report) that has materially affected,
or is reasonably likely to materially affect, the registrants internal
control over financial reporting; and
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5. The registrants other certifying officers and I have disclosed, based
on our most recent evaluation of internal control over financial reporting, to
the registrants auditors and the audit committee of the registrants board of
directors (or persons performing the equivalent functions):



| | a) |  | All significant deficiencies in the design or operation of
internal controls over financial reporting which are reasonably
likely to adversely affect the registrants ability
to record, process, summarize and report financial information; and
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| | b) |  | Any fraud, whether or not material, that involves management or
other employees who have a significant role in the registrants
internal controls over financial reporting; and
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Date: September 12, 2003
    
    /s/ GREGORY T. BARNUMGregory T. Barnum
Chief Financial Officer