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The main function of an OC12 is to grab, synchronize, and transport data, voice, and video at the speed of 622 Megabits per second consistently. Traditional sources of this data include T1 multiplexers and T3 multiplexers, ATM switches and large Internet Protocol (IP) networks. A T1 Line can deliver a Point to Point 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 EoC is an acronym for Ethernet over Copper 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. (3) OC-1 Lines/(3) STS-1 frames concatenates into a single OC-3 data stream The Four OC12 Layers are the (1) Photonic Layer, (2) Section Layer, (3) Line Layer and the (4) Path Layer. 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 The 155.52 Mbps has a payload of 148.608 Mbps an overhead of 6.912 Mbps which includes path overhead using fiber optics |
