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|EXHIBIT 31.2
CERTIFICATION PURSUANT TOSECTION 302 OF THESARBANES-OXLEY ACT OF 2002

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|   | I, PAUL CHENG, certify that:                                                                                                                                                                                                                                                                                                  
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|1. | I have reviewed this annual report on Form 10-K of Castelle;                                                                                                                                                                                                                                                                  
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|2. | Based on my knowledge, this annual 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
  annual report;
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|3. | Based on my knowledge, the financial statements, and other financial information included in this annual
  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 annual report;                     
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|4. | The registrants other certifying officer(s) 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 registrant and have:                                                                                            
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| | 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 annual 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 evaluation; 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 officer(s) 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 registrants board of directors (or persons performing the equivalent functions):
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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 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 control over financial reporting.                                                                                                 
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|Date: March 30, 2007 | By: | /s/ PAUL CHENG         
|                     |     | Paul Cheng             
|                     |     | Chief Financial Officer

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