CONTENTS

1)     Clause 9.1, Introduction    
2)     Clause 9.2, Digital OTN layered structure   
3)     Clause 9.3, Optical channel layer network (OCh)    
4)     Clause 9.6, ODU Time Division Multiplexing             
5)     New clause 9.13, Multi-domain OTN           
6)     New Appendix IV: Examples of multi-domain OTN applications