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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 T1/DS1 Lines are the equivalent of 24 phone lines or 24 DS0's. A DS1/T1 can handle 1.5 million bits per second or 1.5Mbps. 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. 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 When discussing the STS-12 optical carrier frame, the following acronyms apply: SOH (Section Overhead), SPE (Synchronous Payload Envelope), LOH (Line Overhead) and POH (Path Overhead). VoIP is the acronym for Voice Over the Internet Protocol An OC3 Line is also known as STS-3 (Synchronous Transport Signal) |
