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Table 1: Comparing Capacity OC level Number of DS-3 circuits or STS-1 tributaries DS capacity (Mbit/s) ATM capacity (Mbit/s) POS capacity (Mbit/s) OC1 1 45 47 52 OC3 3 135 129 156 OC12 12 540 563 622 OC48 48 2,160 2,254 2,488 OC192 192 8,640 9,014 9,953 OC768 768 17,280 36,057 39,813 DS = Digital signal POS = Packet over Sonet STS =Synchronous transport signal Home Contact Editors Lab Tests Registration Tech Tutorials Buyer's Guide Global Networks Opinion / Columns FAQs Subscriptions