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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 be an Integrated DS1/T1 and communicate both voice and data ATM or Asynchronus Transfer Mode is a very expensive switching solution that is used in deliver OC-3 and OC-12 lines. 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 OC1 or Optical Carrier Level 1 is a SONET line and transmits data at a rate of 51.84 megabits per second with a payload of 50.112 Mbps and an overhead of 1.728 Mbps over optical fiber The Four OC12 Layers are the (1) Photonic Layer, (2) Section Layer, (3) Line Layer and the (4) Path Layer. Codec G.723.1 transmits at 5.3 Kbps and 6.3 Kbps which can be used over Dial-Up with high compression and processing power. The 155.52 Mbps has a payload of 148.608 Mbps an overhead of 6.912 Mbps which includes path overhead using fiber optics |
