<Page> EXHIBIT 12.1 TRICOM, S.A. and Subsidiaries Computation in ratio of earning to fixed charges <Table> <Caption> EARNINGS 1998 1999 2000 2001 2002 - -------------------------------------------------------------------------------------------------------------------------- Earnings Pre-tax ......................... $ 17,553,898 $ 22,295,896 $ 9,815,541 $ (24,377,540) $ (77,476,003) (+) Fixed Charges ................... 28,206,286 34,330,031 45,337,053 51,908,715 67,875,661 (+) Amortized Capital Interest ...... 875,377 1,612,081 2,385,453 3,088,821 3,343,841 (-) Interest Capitalized ............ 10,200,000 11,900,000 11,300,000 9,800,000 3,561,377 ============================================================================= 36,435,561 46,338,008 46,238,047 20,819,996 (9,817,878) <Caption> FIXED CHARGES 1998 1999 2000 2001 2002 - -------------------------------------------------------------------------------------------------------------------------- Interest Expense .................... 18,006,286 22,430,031 34,037,053 42,108,715 64,314,284 Capitalized Interest ................ 10,200,000 11,900,000 11,300,000 9,800,000 3,561,377 ============================================================================= 28,206,286 34,330,031 45,337,053 51,908,715 67,875,661 <Caption> 1998 1999 2000 2001 2002 - -------------------------------------------------------------------------------------------------------------------------- RATIO OF EARNINGS TO FIXED CHARGES ....... 1.2918 1.3498 1.0199 0.4011 (0.1446) </Table>