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Extended Super Frame (ESF) refers to a T1 framing standard that includes 24 frames of 192 bits each. ESF helps to extend D4 super frame from 12 frames to 24 frames. Also, the 193rd bit location is redefined by ESF to add increased efficiency, such as timing and other similar functions. ESF is more useful when compared with its predecessor super frame, because ESF enables facility data link communications and cyclical redundancy check (CRC) error detection.
ESF significantly enhances customer service values by creating real-time metrics about efficiency, and network health and performance. ESF is sometimes referred to as D5 framing.