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شبکه انتقال نوری
Optical Transport Network (OTN) transport frame rates run from OTU1 to OTU4, which correspond to approximately 2.5, 10, 40, and 100 Gb/s, respectively (see Sect. 1.4.2).
These line rates are used to carry OTN services, which range in rate from ODU0 to ODU4.
The finest-granularity OTN service, ODU0, corre- sponds to 1.25 Gb/s.
To provide a more efficient mechanism for carrying a range of services, OTN also supports ODU-Flex.
OTN switches are analogous to SONET/SDH switches, with the switch granu- larity typically being an ODU0.
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