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A traditional method for backing up an OC-12 ring is called a bi-directional ring topology. The OC12 ring is a physical fiber ring looking like an oval shaped loop. This physical topology of the bi-directional ring deploys two sets of fiber strands. A DS1/T1 is also called a Dedicated DS1/T1 T2 or DS-2 is the equivalent of 4 T1 Lines. The capacity is 6.3 million bits per second or 6.3 Mbps 3 major influences contributed to the development of Ethernet whose Corporate names are Digital Equipment, Intel and Xerox. The LSR of the MPLS Network strips off the existing label at each hop and applies a new label that dictates how the next hop will forward the packet. 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 SPE (Synchronous Payload Envelope) is the electronic envelope that transmits the data over the OC12 Line also known as the Payload. G.729 transmits at 8 Kbps and has superior bandwidth utilization which requires a license and is error tolerant. OC-3 are called OC-3c when not being multiplexed from a single data source, the letter "c" (standing for concatenated) |
