##### 



Exhibit 31.2

Chief Financial Officer Certification pursuant to
Section 302 of the Sarbanes-Oxley Act of 2002

I, Héctor Alonso, certify that:

1.     I have reviewed this quarterly report on Form 10-Q of IMPSAT Fiber Networks,
Inc. (the Registrant);

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 Registrant
as of, and for, the periods presented in this report;

4.     The Registrants other certifying officer and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
the Securities Exchange Act of 1934 Rules 13a-15(e) and 15d-15(e)) for the
Registrant 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,         
|
| | (b) [omitted pursuant to the guidance of Release No. 33-8283 (June 5,
2003)],                                                                                                                                                                                                                                                                                                              
|
| | (c) 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                                                                                                    
|
| | (d) 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

5.     The Registrants other certifying officer 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 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
|
| | (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.                                                                                               

| |  |                                                        
| |  | -------------------------------------------------------
| |  | /s/ Héctor Alonso
Héctor Alonso
Chief Financial Officer

November 14, 2003