Superframe: Difference between revisions
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'''Super Frame''' is an older [[framing]] standard for [[T1]]s. Also called D4 or D3/D4 framing. |
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In order to determine where each [[channel]] is located in the stream of data being received, each set of 24 channels is aligned in a frame. The frame is 192 [[bit]]s long (8 * 24), and is terminated with a 193rd bit, the framing bit, which is used to find the end of the frame. |
In order to determine where each [[channel]] is located in the stream of data being received, each set of 24 channels is aligned in a frame. The frame is 192 [[bit]]s long (8 * 24), and is terminated with a 193rd bit, the framing bit, which is used to find the end of the frame. |
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Preferred over Super Frame is [[Extended Super Frame]], which provides additional features. |
Preferred over Super Frame is [[Extended Super Frame]], which provides additional features. |
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[[Category:Telecommunications]] |
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Revision as of 11:02, 12 October 2005
Super Frame is an older framing standard for T1s. Also called D4 or D3/D4 framing.
In order to determine where each channel is located in the stream of data being received, each set of 24 channels is aligned in a frame. The frame is 192 bits long (8 * 24), and is terminated with a 193rd bit, the framing bit, which is used to find the end of the frame.
In order for the framing bit to be located by receiving equipment, a pattern is sent on this bit. Equipment will search for a bit which has the correct pattern, and will align its framing based on that bit. The pattern sent is 12 bits long, so every group of 12 frames is called a Super Frame. The pattern used in the 193rd bit is 1000 1101 1100.
Preferred over Super Frame is Extended Super Frame, which provides additional features.