|DS0||64kbps||Basic Building Block for Fractional DS1|
|DS1||1.544Mbps||8kbps for framing, 1.536Mbps usable|
|E1||2.048Mbps||Europe and Japan|
|E3||34.368Mbps||Europe and Japan|
|OC-3||155.520Mbps||Optical Fiber; 3 x 51.840Mbps|
|OC-3c||155.520Mbps||Optical Fiber; "c" stands for concatenated|
When it is run over a 4-wire copper cable, a DS1 is known as a T1. When a DS3 is run over coaxial cable it is known as a T3.
The "c" in OC-3c means the entire bitstream is concatenated into a single framing format reducing overhead. Ordinary OC-3 pipes are actually three distinct 51.840 Mbps bitstreams (OC-1) each carrying a separate framing overhead.
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