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

|Name                                           | State or Other Jurisdiction of Incorporation
|---------------------------------------------- | --------------------------------------------
|Tellabs Reston, Inc.                           | Delaware                                    
|White Oak Merger Corp.                         | Delaware                                    
|NetCore Systems, Inc.                          | Delaware                                    
|Salix Technologies, Inc.                       | Delaware                                    
|Future Networks, Inc.                          | Georgia                                     
|Tellabs Mexico, Inc.                           | Delaware                                    
|Tellabs de Mexico, S.A. de C.V.                | Mexico                                      
|Tellabs TG, Inc.                               | Delaware                                    
|Tellabs Transport Group, Inc.                  | Quebec                                      
|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 (Thailand) Co., Ltd.                   | Thailand                                    
|Tellabs Korea, Inc.                            | Korea                                       
|Tellabs (V.I.), Inc.                           | U.S. Virgin Islands                         
|Tellabs India Private Limited                  | India                                       
|Tellabs Communications International, Ltd.     | China                                       
|Tellabs de Venezuela, S.A.                     | Venezuela                                   
|Pop-side Solutions Sdn-Bhd                     | Malaysia                                    
|Tellabs Malaysia Sdn Bhd (49% joint venture)   | Malaysia                                    
|Tellabs Holdings B.V.                          | Netherlands                                 
|Tellabs Enterprises B.V.                       | Netherlands                                 
|Tellabs Oy                                     | Finland                                     
|Kiinteisto Oy Mestarinkaare                    | Finland                                     
|Kiinteisto Oy Sinimaentie 6                    | Finland                                     
|Tellabs Denmark A/S                            | Denmark                                     
|Tellabs Communications (India) Private Limited | India                                       
|FIBCOM India Ltd (40% Joint Venture)           | India                                       
|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 (S.A.) (Proprietary) Limited           | South Africa                                
|Tellabs SAS                                    | France                                      
|Tellabs Italia S.r.l.                          | Italy                                       
|Tellabs Netherlands B.V.                       | Netherlands                                 
|Tellabs Poland Sp. z.o.o.                      | Poland                                      
|Tellabs Southern Europe S.A.                   | Spain                                       
|Tellabs GmbH                                   | Germany                                     
|Tellabs Austria Vertriebs GmbH                 | Austria                                     
|Tellabs Norway A/S                             | Norway                                      
|Tellabs U.K. Ltd.                              | United Kingdom                              
|Tellabs Communications UK Limited              | United Kingdom                              
|E. Coherent Communications Systems Ltd.        | United Kingdom