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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 PRI has 23 DS0 Channels OC-12 transmits 600 million bits per second or 600 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 An OC12 can transmit data from 336 DS1/T1's /12 DS3T3's or the equivalent in capacity of OC12 = 622.08 Mbps Codec iLBC (Internet Low Bitrate Codec) transmits at 15 Kbps and is a royalty free narrowband speech codec An OC3 transmits data at a rate of 155.52 megabits per second |
