DB13W3
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| DB13W3 | ||
|---|---|---|
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| Type | Computer video connector | |
| Superseded by | VGA connector / DVI | |
| Hot pluggable | yes | |
| External | yes | |
| Video signal | Analogue RGB or monochrome | |
| Pin out | ||
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| Sun | SGI / DCC | |
| Pin 1 | Ground | Monitor ID bit 3 / Data clock (SCL) |
| Pin 2 | Vertical sync | Monitor ID bit 0 / Bi-directional data (SDA) |
| Pin 3 | Sense #2 | Composite sync / Composite sync |
| Pin 4 | Sense ground | Horizontal drive / Horizontal sync |
| Pin 5 | Composite sync | Vertical drive / Vertical sync |
| Pin 6 | Horizontal sync | Monitor ID bit 1 / DDC (+5V input) |
| Pin 7 | Ground | Monitor ID bit 2 / DDC ground |
| Pin 8 | Sense #1 | Digital ground / Ground |
| Pin 9 | Sense #0 | Digital ground / Ground |
| Pin 10 | Composite ground | Sync ground / Ground |
| A1 | Red | Red |
| A2 | Green (Gray for monochrome) |
Green (Gray for monochrome) |
| A3 | Blue | Blue |
DB13W3 (also known simply as 13W3) is an analog video interface connector that was used primarily on Sun Microsystems, Silicon Graphics and IBM RISC workstations, as well as some displays from Apple Computer. The 13W3 connector is no longer used with modern displays, which have generally moved on to VGA or DVI connectors.
The connector contains 10 standard signal pins and 3 coaxial pins. On the computer side, the pins are female but the coaxial connectors are male. The coaxial connectors carry the video signal split into red, green/gray, and blue; the standard signal pins carry four grounds, three "sense" pins used to communicate with the monitor, vertical sync, horizontal sync, and a composite sync signal.
The 13W3 connector can be converted into a standard VGA connector using cables and adapters that are commonly available. This allows modern multisync monitors, which are common on today's computers, to be used with these workstations as long as they are sync-on-green compatible. Likewise, as many newer Sun monitors support multisync, similar cables can be used to connect them to modern computers.
Even though 13W3 is a standard connector the sync signals are maintained on different pins based on the display and system. Sun Microsystems, Intergraph, IBM RISC and SGI have a different set of pins used for the monitor sense IDs and the sync signals. This can make matching the correct cable to the monitor virtually impossible. Many monitors with 13W3 connectors do not support separate sync as supplied on most PC Systems. Other converters exist to allow connecting newer monitors with VGA connector to the older systems and workstations. The most popular of these is a cable that allows you to set the sync signals with a series of DIP switches built into the cables.
The DB13W3 connector is also used by some 3Com SuperStack Ethernet switches to carry DC power.
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