Dieter wrote:
Jack Carroll writes:
The Sun standard is probably more common; that connector is
called a 13W3, I think. It's a smaller D shell, a DA-size, I think, with 3
coaxial and several pin-and-socket contacts. I don't know the standard;
perhaps the plain pins are for interrogating the monitor type.
standard? Ha!
Looks like the 13W3 is used mostly by Sun and SGI.
There are *at least* 2 different pinouts. Gotta keep the
adapter people employed.
Sun's 13W3 has a pin for "Combined H/V sync" aka "composite" sync,
which also appears to be used for H sync if doing seperate H & V sync,
and also a pin for V sync.
http://www.sun.com/products-n-solutions/hardware/docs/html/817-2400-10/appF.IOpinout-specs.html
Hmmm, so Sun's 13W3 connector could in theory do H&V sync, composite sync,
or sync-on-green. What they actually use is another question.
Lee Causier writes:
My understanding is that Sun traditionally used Composite Sync with
their 13W3 (see my Sun monitor here:
http://www.monitorworld.com/Monitors/sun/gdm1662b.html ) - it is
old-school SGI that used 13W3 with Sync-on-green. (Think IRIS Indigo
etc)
SGI's pinout gif indicates seperate H and V sync pins.
http://techpubs.sgi.com/library/dynaweb_docs/0650/SGI_Admin/books/Onyx2_Rack_OG/sgi_html/figures/2-4.13W3.pinouts.gif
So they also have the pins to do all three types of sync if they wanted to.
Again, what they actually use is another question. Their pinout doesn't mention
composite, so they *probably* aren't using it.
James Richard Tyrer writes:
Don't know that, but I note that pin and socket would probably be good
enough for the sync signals since they are digital. You would only need
the coax connections for the RGB (analog) video signals.
Sun's web page says twisted pair terminated with 75 Ohm.
So, to support various monitors, we need:
1) seperate H, V sync
2) "Combined H/V sync" aka "composite" sync
3) sync-on-green
4) probably need at least two settings for pedestal
BTW, the Sun page specifies 75 Ohms for the coax. :-)
This looks good. It is almost a standard -- it does support either
composite sync or separate H & V sync -- and it is the type of
connector that we need for a high quality monitor.
I presume that "Hydra" cables are already available for 5 BNC monitors
and other adapters as well. This is an important consideration if we
were to implement our own 'standard' we would need cables.
--
JRT
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