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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 PRI DS1/T1 uses it's 24th DS0 channel for signaling T3 or DS-3 is equal to 28 T1 Lines. The capacity is 45 million bits per second or 45 Mbps. 3 major influences contributed to the development of Ethernet whose Corporate names are Digital Equipment, Intel and Xerox. 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 SPE (Synchronous Payload Envelope) is the electronic envelope that transmits the data over the OC12 Line also known as the Payload. 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) |
