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A traditional method for backing up an OC-12 ring is called a bi-directional ring topology. The OC12 ring is a physical fiber ring looking like an oval shaped loop. This physical topology of the bi-directional ring deploys two sets of fiber strands. DS1/T1 Line may also deliver a Fractional DS1/T1 Speed. T2 or DS-2 is the equivalent of 4 T1 Lines. The capacity is 6.3 million bits per second or 6.3 Mbps 3 major influences contributed to the development of Ethernet whose Corporate names are Digital Equipment, Intel and Xerox. 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. 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 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.722 transmits at 48 Kbps, 56 Kbps and 64 Kbps The 155.52 Mbps has a payload of 148.608 Mbps an overhead of 6.912 Mbps which includes path overhead using fiber optics |
