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Black Box Explains...The 13W3 connector

The 13W3 connector, also called a 13C3 or DB13W3 connector, is an unusual connector that combines a 10-pin D-shell with three analog video conductors. It supports very-high-resolution analog video signals and has been used by Sun Microsystems®, SGI, NeXt, Intergraph, and other manufacturers. Although 13W3 connectors from different manufacturers look the same, they may be pinned differently.

Pinning for a standard Sun® 13W3 connector:
A1: Red
A2: Green/Gray
A3: Blue
1: Ground*
2: Vertical Sync*
3: Sense 2
4: Sense Ground
5: Composite Sync
6: Horizontal Sync*
7: Ground*
8: Sense 1
9: Sense 0
10: Composite Ground

* Considered obsolete; may not be connected.