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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 T1 Line can deliver a Point to Point OC-3 is the equivalent of 155 million bits per second or 155 Mbps. There are 3 standards of Ethernet that are covered by IEEE 802.3 what is commonly known as the CSMA/CD Protocol. The LSR of the MPLS Network strips off the existing label at each hop and applies a new label that dictates how the next hop will forward the packet. 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 STS-12 is the abridged term standing for Synchronous Transport Signal level 12. SONET OC and STS transmit the same electrical equivalent, hence the SONET level OC-12 is the same as STS-12. Codec Speex transmits at 2.15 Kbps, 44 Kbps and minimizes bandwidth usage by using variable bit rate. OC-3 are called OC-3c when not being multiplexed from a single data source, the letter "c" (standing for concatenated) |