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An OC12 is the abridged term for Optical Carrier level 12 (OC-12), used to dictate the speed level of fiber optic networks. The OC12 speed is measured through SONET or otherwise known as Synchronous Optical Network standards. A PRI DS1/T1 uses it's 24th DS0 channel for signaling 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 Ethernet was developed around the 1970s by Xerox Corporation by an experimental coaxial cable network to transmit data up to 3 Mbps. The acronym MPLS stands for Multiprotocol Label Switching 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 An OC12 can transmit data from 336 DS1/T1's /12 DS3T3's or the equivalent in capacity of OC12 = 622.08 Mbps 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 An OC3 transmits data at a rate of 155.52 megabits per second |