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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. 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. 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. 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 SOH (Section Overhead) operates all the links inside the OC-12 while relaying line status to the bandwidth subscriber. The information within Section Overhead (SOH) includes the status of the notification of messages, transported data packets, as well as the alarm levels. Codec G.711 transmits at 64 Kbps the most precise in speech transmission An OC3 transmits data at a rate of 155.52 megabits per second |
