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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 is also called a Dedicated DS1/T1 OC-1 or also known as the term SONET. An OC1 uses ATM switches, as OC-X does and runs at 51 million bits per second or 51 Mbps. OC-X uses optical fiber 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. An Optical Carrier Level 1 or OC1 Line is also known as STS-1 (Synchronous Transport Signal) An OC12 can transmit data from 336 DS1/T1's /12 DS3T3's or the equivalent in capacity of OC12 = 622.08 Mbps Codec iLBC (Internet Low Bitrate Codec) transmits at 15 Kbps and is a royalty free narrowband speech codec OC-3c as mentioned above concatenates (3) STS-1(OC-1) frames into a single OC-3 mirrored stream of data |
