EXHIBIT 11.1 NEWBRIDGE NETWORKS CORPORATION COMPUTATION OF EARNINGS PER SHARE (Accounting principles generally accepted in Canada) (Canadian dollars, amounts in thousands except per share data) (Unaudited) Fiscal quarters ended Three fiscal quarters ended --------------------- --------------------------- Jan 31, Feb 1, Jan 31, Feb 1, 1999 1998 1999 1998 -------- ---------- --------- ---------- BASIC EARNINGS (LOSS) PER SHARE Net earnings (loss) $120,119 $(144,283) $208,953 $(21,936) ======== ========= ======== ======== Common Shares outstanding at the beginning of the period 176,877 175,305 175,686 171,859 Weighted average number of Common Shares issued during the period 719 71 1,128 2,479 -------- --------- -------- -------- Weighted average number of Common Shares outstanding during the period 177,596 175,376 176,814 174,338 ======== ========= ======== ======== Basic earnings (loss) per share $ 0.68 $ (0.82) $ 1.18 $ (0.13) ======== ========= ======== ======== FULLY DILUTED (LOSS) EARNINGS PER SHARE Earnings (loss) before imputed earnings $120,119 $(144,283) $208,953 $(21,936) After tax imputed earnings from the investment of funds received through dilution 7,353 -- 21,006 -- -------- --------- -------- -------- Adjusted net earnings (loss) $127,472 $(144,283) $229,959 $(21,936) ======== ========= ======== ======== Weighted average number of Common Shares outstanding during the period 177,596 175,376 176,814 174,338 Weighted average common share equivalents based on conversion of outstanding stock options 22,355 -- 21,214 -- -------- --------- -------- -------- Weighted average number of Common Shares and equivalents outstanding during the period 199,951 175,376 198,028 174,338 ======== ========= ======== ======== Fully diluted earnings (loss) per share $ 0.64 $ (0.82) $ 1.16 $ (0.13) ======== ========= ======== ======== EARNINGS (LOSS) PER SHARE EXPRESSED IN U.S. DOLLARs Daily average exchange rate of a Canadian dollar for U.S. dollars as reported by the Federal Reserve Bank of New York $ 0.6515 $ 0.7006 $ 0.6618 $ 0.7071 Basic earnings (loss) per share, in U.S. dollars $ 0.44 $ (0.58) $ 0.78 $ (0.09) ======== ========= ======== ======== Fully diluted earnings (loss) per share, in U.S. dollars $ 0.42 $ (0.58) $ 0.77 $ (0.09) ======== ========= ======== ======== (Page 30 of 32)