vga sync on video cat5e
Hi All,
Thank you for all of your answers. Here are my replies and still could not figure out how to solve my problem, I have made further research on net and found followings:
echo47 : supply voltage is 12V and i am planning to supply only the "Video over CAT5 driver" circuit and i want "video over CAT5 receiver " to get its supply volatage over one pair of twisted pair wires.
anok: Thank you for pointing me Analog devices AD8133 triple differantial driver , i have checked the datasheet and i could not find any information on solving my problem with Vsync and Hsync (my first post).
IanP: Thank you for the link , that was usuful at least i have some solution now i can use 4th twisted pair on CAT5 cable to transmit +Composite Sync -Composite Sync , but do not i need a reference ground signal for all these signals on CAT5 cable since now all wires are occupied with differencial signals ?
I have decided to read some installation manuals of commorcial products and i have found this :
one of the companies is giving details of signals carried on each wire at CAT5 cable :
wires connected to RJ45 connector:
Pin Color Wire
1 White-green Red/V. sync+
2 Green Red/V. sync-
3 White-orange Power
4 Blue Green+
5 White-blue Green-
6 Orange Power
7 White-brown Blue/H. sync+
8 Brown Blue/H. sync-
it seems like they are converting and transmitting Hsync and Vsync on Red and Blue as separate and imposed differantial signals ?
What is the logic behind this ? Any idea?
How that is possible to send both red and blue signals and sync signals on the same wires ???
I am curious about the Vsync and Hsync circuit on both receiver and transmitter side of the video over CAT5 .
i have looked to some IC manufactures and found that Intersil has this IC, EL4543 Triple Differential Twisted-Pair Driver with Embedded Sync Encoding.
This manufactured this year, a new one.
How they are doing that ? what is the logic behind not using 4th twisted pair but embedding syncs on other twisted pairs ?
thank you for your help,
I appreciate your help
Iceskater