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Exhibit 31(b)

CERTIFICATION PURSUANT TO RULE 13a-15(e) and 15d-15(e)

I, Steven P. Kovac, certify that:



| | 1. |  | I have reviewed this report on Form 10-Q of Interphase Corporation
(the Company);                                                                                                                                                                                                                       
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|
| | 2. |  | Based on my knowledge, this 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 report;
|
| | 3. |  | Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material
respects the financial condition, results of operations and cash flows of
the Company as of, and for, the periods presented in this report;                      
|
| | 4. |  | The Companys other certifying officer 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 Company 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 Company, 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 Company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 evaluation; and                                                                                            
|
| |  |  | (c) Disclosed in this report any change in the Companys internal control
over financial reporting that occurred during the Companys most recent
fiscal quarter that has materially affected, or is reasonably likely to
materially affect, the Companys internal control over financial reporting;
and                                                                      



| | 5. |  | The Companys other certifying officer and I have disclosed, based on
our most recent evaluation of internal control over financial reporting,
to the Companys auditors and the Audit Committee of the Companys Board
of Directors:
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| |  |  | (a) All significant deficiencies and material weaknesses in the design or
operation of internal control over financial reporting which are reasonably
likely to adversely affect the Company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 Companys internal control over
financial reporting.                                                                                               

|      |  |                 |  |            |  |                         | 
|----- |  | --------------- |  | ---------- |  | ----------------------- | 
|Date: |  | August 12, 2003 |  | Signature: |  | /s/ Steven P. Kovac    
|      |  |                 |  |            |  |                        
|      |  |                 |  |            |  | Chief Financial Officer