ODUflex

ODUflex was introduced into the G.709 standards in 2009 

Two flavors of ODUflex standardization  

1.Circuit ODUflex 

 •Supports any possible client bit rate as service in circuit transport networks 

•CBR clients use a bit-sync mapping into ODUflex (239/238xthe client rate)  

2.Packet ODUflex 

•Supports variable length packet trunks for transporting packet flows using layer 0 switching 

•Theoretically can be of any size but in practice is usually set to be multiples of the lowest tributary slot size in the network  In order to support ODUflex a new ODU was created called ODU2e ODU2e Definition New Low Order (LO) tier of the hierarchy (Oct 2009) to transport “proprietary” 10G signals  

•Serves as a logical wrapper for 10GBASE-R when carried over a standardized physical layer of OTU3 or OTU4 

•Part of compromise made to enable standards progress - most commonly deployed 

•“proprietary” transparent mapping of 10GBASE-R 

•Over-clocked physical OTU2e signal remains in G.sup43 

•Can map ´10 into OPU4 (which is sized to carry 100GBASE-R) 

•Can map as ODUflex in 9´1.25G OPU3 tributary slots (up to 3´ODU2e per OPU3)  

OPU2e can carry:  

•10GBase-R 

•Transcoded FC-1200