| 1/15 | Access
    network transport | 
          
            | 2/15 | Characteristics
    of optical systems in local access networks for transport and distribution | 
            
              | 3/15 | DCEs for
    digital leased circuits | 
              
                | 4/15 | Transceivers
    for subscriber access systems | 
                
                  | 5/15 | Operation
    and administration aspects of signal processing network equipment | 
                  
                    | 6/15 | Circuit
    multiplication equipment (CME) and systems (CMS) | 
                    
                      | 7/15 | Network
    echo control and interaction of acoustic echo controllers and network equipment | 
                      
                        | 8/15 | Speech,
    voiceband and audio transmission in ATM/B-ISDN systems | 
                        
                          | 9/15 | Transport
    equipment and network protection/restoration | 
                          
                            | 10/15 | ATM and
    Internet Protocol (IP) Network Element (NE) Functions | 
                            
                              | 11/15 | Signal
    structures, interfaces and interworking for transport networks | 
                              
                                | 12/15 | Muldexes
    and statistical muldexes for telegraphy and data transmission using digital bearer
    channels | 
                                
                                  | 13/15 | Management
    functions and services of transport systems and equipment | 
                                  
                                    | 14/15 | Management
    of transport equipment from the element level view | 
                                    
                                      | 15/15 | Characteristics
    and test methods of optical fibres and cables | 
                                      
                                        | 16/15 | Characteristics
    of optical systems for inter-office and long distance networks | 
                                        
                                          | 17/15 | Characteristics
    of active and passive optical components and subsystems | 
                                          
                                            | 18/15 | Characteristics
    of optical fibre submarine cable systems | 
                                            
                                              | 19/15 | Reliability
    and availability of optical systems | 
                                              
                                                | 20/15 | Characteristics
    of optical networking | 
                                                
                                                  | 21/15 | Transport
    Network Equipment for Interconnecting GSTN and IP Networks | 
                                                
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