1 EXHIBIT 12.1 XO COMMUNICATIONS RATIO OF EARNINGS TO FIXED CHARGES (IN THOUSANDS) FOR THE PERIOD ENDED ---------------------------------------------------------------------------- ------------- FOR THE YEAR ENDED 6/30/01 ---------------------------------------------------------------------------- ------------- 1995 1996 1997 1998 1999 2000 2001 ---------- --------- ---------- ------------ ----------- -------------- ------------- EARNINGS: Net Loss $ (12,731) $ (71,101) $ (129,004) $ (278,340) $ (558,692) $ (1,101,299) $ (904,627) Less interest capitalized during the period, net - - (1,793) (4,311) (9,924) (31,033) (30,642) Add equity investment losses - 1,100 2,891 3,677 4,385 6,417 2,858 Add fixed charges 609 31,348 57,694 152,313 299,671 479,687 278,015 ---------- --------- ---------- ------------ ----------- -------------- ------------- CALCULATED EARNINGS $ (12,122) $ (38,653) $ (70,212) $ (126,661) $ (264,560) $ (646,228) $ (654,396) FIXED CHARGES: Total interest expense including capitalized interest $ 499 $ 30,876 $ 56,288 $ 148,876 293,047 465,155 265,074 Est. of Interest within Rental Exp. 110 472 1,406 3,437 6,624 14,532 12,941 ---------- --------- ---------- ------------ ----------- -------------- ------------- TOTAL FIXED CHARGES $ 609 $ 31,348 $ 57,694 $ 152,313 $ 299,671 $ 479,687 $ 278,015 RATIO OF EARNINGS TO FIXED CHARGES - - - - - - DEFICIENCY $ (12,731) $ (70,001) $ (127,906) $ (278,974) $ (564,231) $ (1,125,915) $ (932,411)