EXHIBIT 21.1

LIST OF SUBSIDIARIES



|                                          |  |                                                            
|----------------------------------------- |  | -----------------------------------------------------------
|Subsidiary                                |  | State or Other Jurisdiction ofIncorporation or Organization
|Ark Electronic Products, Inc.             |  | Florida                                                    
|Astarte Fiber Networks, Inc.              |  | Colorado                                                   
|Osicom Technologies Europe Limited        |  | United Kingdom                                             
|Paradyne Canada, LTD                      |  | Canada                                                     
|Paradyne Corporation                      |  | Delaware                                                   
|Paradyne Finance Corp.                    |  | Delaware                                                   
|Paradyne Networks, Inc.                   |  | Delaware                                                   
|Paradyne Worldwide Corporation            |  | Delaware                                                   
|PDP Acquisition Corp.                     |  | California                                                 
|Premisys Communications, Inc.             |  | Delaware                                                   
|Premisys Communications Ltd.              |  | United Kingdom                                             
|R-Net International, Inc.                 |  | Nevada                                                     
|Sciteq Communications, Inc.               |  | Nevada                                                     
|Simpulan Mutiara Sdn. Bhd.                |  | Malaysia                                                   
|Sorrento Networks Corporation             |  | Delaware                                                   
|Sorrento Networks Europe SA               |  | Belgium                                                    
|Sorrento Networks GmbH                    |  | Germany                                                    
|Sorrento Valley Real Estate Holdings, LLC |  | California                                                 
|Xybridge Technologies, Inc.               |  | Texas                                                      
|Zhone AB                                  |  | Sweden                                                     
|Zhone International Ltd.                  |  | Cayman Islands                                             
|Zhone International Limited               |  | UK                                                         
|Zhone Technologies Australia PTY LTD      |  | Australia                                                  
|Zhone Technologies B.V.                   |  | Netherlands                                                
|Zhone Technologies Campus, LLC            |  | California                                                 
|Zhone Technologies De Argentina SRL       |  | Argentina                                                  
|Zhone Technologies de Colombia Limitada   |  | Colombia                                                   
|Zhone Technologies do Brasil LTDA         |  | Brazil                                                     
|Zhone Technologies GMBH                   |  | Germany                                                    
|Zhone Technologies, Inc.                  |  | Canada                                                     
|Zhone Technologies International, Inc.    |  | Delaware                                                   
|Zhone Technologies KK                     |  | Japan                                                      
|Zhone Technologies Limited                |  | Hong Kong                                                  
|Zhone Technologies Ltd.                   |  | United Kingdom                                             
|Zhone Technologies Pte. Ltd.              |  | Singapore                                                  
|Zhone Technologies S. de R.L. de C.V.     |  | Mexico                                                     
|Zhone Technologies S.R.L.                 |  | Italy                                                      
|ZTI Merger Subsidiary III, Inc.           |  | Delaware