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The main function of an OC12 is to grab, synchronize, and transport data, voice, and video at the speed of 622 Megabits per second consistently. Traditional sources of this data include T1 multiplexers and T3 multiplexers, ATM switches and large Internet Protocol (IP) networks. A Business DS1/T1 Line is more reliable than DSL T4 or DS-4 is the equivalent of 6 T3 Lines. The capacity is 274 million bits per second or 274 Mbps. The 3 famous data rates are as follows that operate over optical fiber and twisted pair cables which are 10 Mbps-10Base-T Ethernet, 100 Mbps-Fast Ethernet and 1000 Mbps-Gigabit Ethernet. The acronym MPLS stands for Multiprotocol Label Switching The 155.52 Mbps of an OC3 Line has a payload of 148.608 Mbps an overhead of 6.912 Mbps which includes path overhead using fiber optics STS-12 is the abridged term standing for Synchronous Transport Signal level 12. SONET OC and STS transmit the same electrical equivalent, hence the SONET level OC-12 is the same as STS-12. A T1 Line/1.54 MB can transmit 24 simultaneous calls via VoIP at 64 KB using Codec G.711 or G.722 OC-3c as mentioned above concatenates (3) STS-1(OC-1) frames into a single OC-3 mirrored stream of data |
