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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 T1/DS1 Line is synonymous with a T1/DS1 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. An Optical Carrier Level 1 or OC1 Line is also known as STS-1 (Synchronous Transport Signal) The Four OC12 Layers are the (1) Photonic Layer, (2) Section Layer, (3) Line Layer and the (4) Path Layer. Codec GSM (Global System for Mobile Communications) transmits at 13 Kbps and has a high compression ratio and is available in many hardware and software platforms which is the same encoding that is used in GSM cellphones OC-3 are called OC-3c when not being multiplexed from a single data source, the letter "c" (standing for concatenated) |
