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NORTH AMERICA, JAPAN, KOREA, ETC. Voice Service Channels Speed DS0 1 64 Kbps DS1 24 1.544 Mbps (T1) DS1C 48 3.152 Mbps (T1C) DS2 96 6.312 Mbps (T2) DS3 672 44.736 Mbps (T3) DS4 4032 274.176 Mbps (T4) EUROPE (ITU) Voice Speed Service Channels (Mbps) E1 30 2.048 E2 120 8.448 E3 480 34.368 E4 1920 139.264 E5 7680 565.148 SONET CIRCUITS Optical Electrical Speed Channel Channel (Mbps) OC-1 STS-1 51.84 OC-3 STS-3 155.52 OC-3c STS-3c 155.52 OC-12 STS-12 622.08 OC-12c STS-12c 622.08 OC-48 STS-48 2488.32 OC-192 STS-192 9953.28 OC-768 STS-768 39813.12 OC = Optical Carrier STS = Synchronous Transport Signal c = concatenated