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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 DS1/T1 Line has 24 DS0 Channels T4 or DS-4 is the equivalent of 6 T3 Lines. The capacity is 274 million bits per second or 274 Mbps. There are 3 standards of Ethernet that are covered by IEEE 802.3 what is commonly known as the CSMA/CD Protocol. Incoming packets in an MPLS network are assigned a label by a label edge router or (LER). An OC1 or Optical Carrier Level 1 is a SONET line and transmits data at a rate of 51.84 megabits per second with a payload of 50.112 Mbps and an overhead of 1.728 Mbps over optical fiber 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). G.729 transmits at 8 Kbps and has superior bandwidth utilization which requires a license and is error tolerant. An OC3 is also known as STM-1x (Synchronous Transport Module) |
