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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 Business Class DS1/T1 comes with an SLA Frame relay runs around 64,000 bits per second to 1.5 million bits per second or 64 kbps to 1.5 Mbps. Ethernet was developed around the 1970s by Xerox Corporation by an experimental coaxial cable network to transmit data up to 3 Mbps. 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 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 The Four OC12 Layers are the (1) Photonic Layer, (2) Section Layer, (3) Line Layer and the (4) Path Layer. Codec G.711 transmits at 64 Kbps the most precise in speech transmission OC-3 are called OC-3c when not being multiplexed from a single data source, the letter "c" (standing for concatenated) |
