EXHIBIT No. 21
Tellabs Inc. and Subsidiaries
Subsidiaries of the Registrant

|Name                                       | State or Other Jurisdiction of Incorporation
|------------------------------------------ | --------------------------------------------
|Tellabs Operations, Inc.                   | Delaware                                    
|Telecommunications Laboratories, Inc.      | Illinois                                    
|Telecon Acquisition Corp.                  | Delaware                                    
|Tellabs Export, Inc.                       | Delaware                                    
|Tellabs Japan, Inc.                        | Delaware                                    
|Tellabs Manufacturing, Inc.                | Delaware                                    
|Tellabs International, Inc.                | Illinois                                    
|Tellabs Communications Canada Ltd.         | Canada                                      
|Tellabs do Brazil, Ltda.                   | Brazil                                      
|Tellabs N.Z. Ltd.                          | New Zealand                                 
|Tellabs H.K. Ltd.                          | Hong Kong                                   
|Tellabs Pty. Ltd.                          | Australia                                   
|Tellabs International de Mexico            | Mexico                                      
|Tellabs Asia Pacific Private Limited       | Singapore                                   
|Tellabs Communications International, Ltd. | China                                       
|Tellabs (Thailand) Co., Ltd.               | Thailand                                    
|Tellabs Korea, Inc.                        | Korea                                       
|Tellabs Malaysia Sdn Bhd                   | Malaysia                                    
|Tellabs (V.I.), Inc.                       | U.S. Virgin Islands                         
|Tellabs India Private Limited              | India                                       
|Tellabs Holdings B.V.                      | Netherlands                                 
|Tellabs Enterprises B.V.                   | Netherlands                                 
|Tellabs Oy                                 | Finland                                     
|Kiinteisto Oy Mestarinkaare                | Finland                                     
|Kiinteisto Oy Sinimaentie 6                | Finland                                     
|Tellabs (S.A.) Proprietary Ltd.            | South Africa                                
|Tellabs Holdings, Ltd.                     | Ireland                                     
|Tellabs (Ireland) Ltd.                     | Ireland                                     
|Tellabs Ltd.                               | Ireland                                     
|Tellabs Research Ltd.                      | Ireland                                     
|Tellabs Communications Ireland Limited     | Ireland                                     
|Tellabs Communications Technologies        | Ireland                                     
|Tellabs EMEA Holdings, Ltd.                | Ireland                                     
|Tellabs AB                                 | Sweden                                      
|Tellabs SAS                                | France                                      
|Tellabs (S.A.) (Proprietary) Limited       | South Africa                                
|Tellabs Italia S.r.l.                      | Italy                                       
|Tellabs Netherlands B.V.                   | Netherlands                                 
|Tellabs Poland Sp. z.o.o.                  | Poland                                      
|Tellabs GmbH                               | Germany                                     
|Tellabs Southern Europe S.A.               | Spain                                       
|Tellabs Austria Vertriebs GmbH             | Austria                                     
|Tellabs U.K. Ltd.                          | United Kingdom                              
|Tellabs Communications UK Limited          | United Kingdom                              
|E. Coherent Communications Systems Ltd.    | United Kingdom                              
|Tellabs Denmark A/S                        | Denmark                                     
|DSC Communications (India) Private Limited | India                                       
|FIBCOM India Ltd.                          | (40% Joint Venture)                         
|White Oak Merger Corp.                     | Delaware                                    
|Tellabs TG, Inc.                           | Delaware                                    
|Tellabs Transport Group, Inc.              | Quebec                                      
|NetCore Systems, Inc.                      | Delaware                                    
|Salix Technologies, Inc.                   | Delaware                                    
|Tellabs Mexico, Inc.                       | Delaware                                    
|Tellabs de Mexico, S.A. de C.V.            | Mexico