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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. DS1/T1 Line may also deliver a Fractional DS1/T1 Speed. T3 or DS-3 is equal to 28 T1 Lines. The capacity is 45 million bits per second or 45 Mbps. The 3 famous data rates are as follows that operate over optical fiber and twisted pair cables which are 10 Mbps-10Base-T Ethernet, 100 Mbps-Fast Ethernet and 1000 Mbps-Gigabit Ethernet. 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 155.52 Mbps of an OC3 Line has a payload of 148.608 Mbps an overhead of 6.912 Mbps which includes path overhead using fiber optics 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 An OC3 is also known as STM-1x (Synchronous Transport Module) |
