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A DS3/T3 Line can be a Point to Point 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. Ethernet was developed around the 1970s by Xerox Corporation by an experimental coaxial cable network to transmit data up to 3 Mbps. 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). A T1 Line/1.54 MB can transmit 24 simultaneous calls via VoIP at 64 KB using Codec G.711 or G.722 An OC3 transmits data at a rate of 155.52 megabits per second |
