STS-1 OC-1 51.840 Mbps 810 voice circuits STS-3 OC-3 155.520 Mbps 2430 voice circuits STS-12 OC-12 622.080 Mbps 9720 voice circuits STS-24 OC-24 1,244.160 Mbps 19440 voice circuits STS-48 OC-48 2,488.320 Mbps 38880 voice circuits STS-192 OC-192 9,953.280 Mbps 155520 voice circuits