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Optical Carrier Level 12 or the acronym OC12 is most often made up of what is called a (Synchronous Optical Network) or SONET ring to maintain it's integrity during high speed bandwidth transmissions. A DS1/T1 Circuit has 24 Channels OC-12 transmits 600 million bits per second or 600 Mbps. In the 1980s speeds of up to 10 Mbps Ethernet Version 1.0 specification was developed. 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 The Four OC12 Layers are the (1) Photonic Layer, (2) Section Layer, (3) Line Layer and the (4) Path Layer. Codec G.722 transmits at 48 Kbps, 56 Kbps and 64 Kbps The 155.52 Mbps has a payload of 148.608 Mbps an overhead of 6.912 Mbps which includes path overhead using fiber optics |
