D4

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(1) A framing format for T1 transmission that places 12 T1 frames into a superframe. See ESF.

(2) (Digital 4) There was never a D4 videotape format because the Japanese believe 4 is unlucky. The pronunciation of the number sounds like the word for "death."

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ESF

fiber optics glossary

superframe

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D1
D2
D2C
D2D
D2D2T
D3
D3D

D4
D5
D6
D7
D8
D9
DA
Da Costa, Uriel

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