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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 ATM or Asynchronus Transfer Mode is a very expensive switching solution that is used in deliver OC-3 and OC-12 lines. 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 SPE (Synchronous Payload Envelope) is the electronic envelope that transmits the data over the OC12 Line also known as the Payload. Codec G.723.1 transmits at 5.3 Kbps and 6.3 Kbps which can be used over Dial-Up with high compression and processing power. An OC3 transmits data at a rate of 155.52 megabits per second |
