Super Frame is an older framing standard for T1s. Also called D4 or D3/D4 framing. In the 1970s it replaced the original T1/D1 framing scheme of the 1960s in which the framing bit simply alternated. While receiving a stream of framed Data, frame synchronization is the process by which incoming frame alignment signals i
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. Channel, in communications (sometimes called communications channel) refers to the medium used to convey Information from a 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. A bit is a binary digit, taking a value of either 0 or 1 Binary digits are a basic unit of Information storage and communication
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.
Superframe remained in service in many places through the turn of the century, replaced by the improved Extended Super Frame of the 1980s in applications where its additional features were desired. In Telecommunication, an Extended Super Frame ( ESF) is a T1 framing standard, sometimes called D5 framing invented in the 1980s
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