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 -------------------- Aug 2, Aug 3, 1998 1997 -------- -------- BASIC EARNINGS PER SHARE Net earnings $ 35,520 $ 64,354 ======== ======== Common Shares outstanding at the beginning of the period 175,686 171,859 Weighted average number of Common Shares issued during the period 419 1,105 -------- -------- Weighted average number of Common Shares outstanding during the period 176,105 172,964 ======== ======== Basic earnings per share $0.20 $0.37 ======== ======== FULLY DILUTED EARNINGS PER SHARE Earnings before imputed earnings $ 35,520 $ 64,354 After tax imputed earnings from the investment of funds received through dilution 6,817 3,979 -------- -------- Adjusted net earnings $ 42,337 $ 68,333 ======== ======== Weighted average number of Common Shares outstanding during the period 176,105 172,964 Weighted average common share equivalents based on conversion of outstanding stock options 20,645 16,118 -------- -------- Weighted average number of Common Shares and equivalents outstanding during the period 196,750 189,082 ======== ======== Fully diluted earnings per share $0.20 $0.36 ======== ======== 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 $0.6817 $0.7242 Basic earnings per share, in U.S. dollars $0.14 $0.27 ======== ======== Fully diluted earnings per share, in U.S. dollars $0.14 $0.26 ======== ======== (Page 21 of 23)