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 QUARTER ENDED TWO FISCAL QUARTERS ENDED -------------------- -------------------------- Nov 2, Oct 27, Nov 2, Oct 27, 1997 1996 1997 1996 --------- -------- ----------- ----------- BASIC EARNINGS PER SHARE Net earnings $ 57,993 $ 62,781 $122,347 $123,582 ======== ======== ======== ======== Common shares outstanding at the beginning of the period 174,245 169,754 171,859 168,676 Weighted average number of Common Shares issued, net of Common Shares repurchased, during the period 488 478 1,971 1,060 -------- -------- -------- -------- Weighted average number of Common Shares outstanding during the period 174,733 170,232 173,830 169,736 ======== ======== ======== ======== Basic earnings per share $ 0.33 $ 0.37 $ 0.70 $ 0.73 ======== ======== ======== ======== FULLY DILUTED EARNINGS PER SHARE Earnings before imputed earnings $ 57,993 $ 62,781 $122,347 $123,582 After tax imputed earnings from the investment of funds received through dilution 4,363 2,715 8,342 5,598 -------- -------- -------- -------- Adjusted net earnings $ 62,356 $ 65,496 $130,689 $129,180 ======== ======== ======== ======== Weighted average number of Common Shares outstanding during the period 174,733 170,232 173,830 169,736 Weighted average common share equivalents based on conversion of outstanding stock options 15,783 13,899 15,953 13,198 -------- -------- -------- -------- Weighted average number of Common Shares and equivalents outstanding during the period 190,516 184,131 189,783 182,934 ======== ======== ======== ======== Fully diluted earnings per share $ 0.33 $ 0.36 $ 0.69 $ 0.71 ======== ======== ======== ======== EARNINGS 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 $ 0.7204 $ 0.7322 $ 0.7223 $ 0.7316 Basic earnings per share, in U.S. dollars $ 0.24 $ 0.27 $ 0.51 $ 0.53 ======== ======== ======== ======== Fully diluted earnings per share, in U.S. dollars $ 0.24 $ 0.26 $ 0.50 $ 0.52 ======== ======== ======== ======== (Page 22 of 24)