S O N E TSynchronous Optical NETwork
1985 SONET was born by the ANSI standards body T1 X1
as Synchronous Fibre Optics Network for Digital communications.
1986 CCITT ( now ITU ) joined the movement.
Optical Level Europe Electrical Line Rate Payload Overhead H Equivalent
ITU Level (Mbps) (Mbps) (Mbps)
OC - 1 --- STS - 1 51.840 50.112 1.728 ---
OC - 3 SDH1 STS - 3 155.520 150.336 5.184 STM- 1
OC - 12 SDH4 STS - 12 622.080 601.344 20.736 STM- 4
OC - 48 SDH16 STS - 48 2488.320 2405.376 82.944 STM-16
OC-192 SDH48 STS-192 9953.280 9621.504 331.776 STM-64