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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 Line can also be Bonded DS1/T1 Line T4 or DS-4 is the equivalent of 6 T3 Lines. The capacity is 274 million bits per second or 274 Mbps. Metro Ethernet got its name from mostly being in metropolitan areas Packets are forwarded along a Label Switch Path or (LSP), where each label switch router (LSR) prioritizes each label whether it be Data, Video, Voice, etc. solely based on the contents of the label. The Optical Carrier (OC) is multiplied for use by other OC-n standards. For illustration purposes, an OC-3 Line is 3 times the rate of OC-1 Line 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-3 are called OC-3c when not being multiplexed from a single data source, the letter "c" (standing for concatenated) |