Standardized digital transmission rates for the synchronous digital hierarchy (SDH), the synchronous optical network (SONET), and the optical carrier (OC) hierarchy
Table
Standardized digital transmission rates for the synchronous digital hierarchy (SDH), the synchronous optical network (SONET), and the optical carrier (OC) hierarchy*
SDH system SONET system OC level transmission rate in megabits per second (Mbps) or gigabits per second (Gbps) maximum voice channels per circuit
STS-1 OC-1 51.84 Mbps 783
STM-1 STS-3 OC-3 155.52 Mbps 2,349
STM-4 STS-12 OC-12 622.08 Mbps 9,396
OC-24 1,244.16 Mbps 18,792
STM-16 STS-48 OC-48 2.4888 Gbps 37,584
*SDH is the transmission hierarchy established by the International Telegraph and Telephone Consultative Committee (CCITT); SONET and OC are transmission hierarchies established by the American National Standards Institute (ANSI).
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