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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 T1 can transmit bandwidth at a rate of 1.544 megabits per second and has 24 DS0 lines 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. Incoming packets in an MPLS network are assigned a label by a label edge router or (LER). (3) OC-1 Lines/(3) STS-1 frames concatenates into a single OC-3 data stream 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). Codec G.726 transmits at 16 Kbps, 24 Kbps, 32 Kbps and 40 Kbps which is an improved version of G.721 and G.723 but different from Codec G.723.1 An OC3 is also known as STM-1x (Synchronous Transport Module) |
