DD11-D backplane

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The DD11-D backplane is a 9-slot MUD backplane system unit. It was normally installed in a BA11 mounting box.

There are two versions, the DD11-DF and DD11-CK, intended for use in the BA11-F Mounting Box and BA11-K mounting box, respectively; they differ basically only in the length of the power harness, although the two provide +5VB (battery backup) on different pins of the DEC power distribution connectors.