Silicon Graphics VBOB, Руководство пользователя, Страница: 23 / 40

Theory of Operation
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LVDS Interface
LVDS is a new data interface standard that is defined in the TIA/EIA-644 and the IEEE
1596.3 standards. It transmits data at a high speed using a very low voltage swing
(approximately 350mV) over two differential circuit board traces or a balanced cable. The
LVDS drivers are current mode, so a termination resistor is required to complete the
current loop and limit reflections due to the sub-nanosecond transition times over the
transmission line.
Genlock
Genlock is a device that enables VBOB to receive an external sync signal, which locks the
timing of the output video picture. This allows you to maintain a common timing across
multiple video devices, which enables smooth dissolves, wipes, and other effects
commonly used on broadcast TV. VBOB has two BNC connectors for Standard Definition
genlock and two BNC connectors for High Definition genlock. You can use either of these
connectors as an input or a loop-through.
TMDS Interface (optional)
TMDS is the basis of the Digital Visual Interface (DVI) standard, which transmits data
using a differential interface with the data transitions minimized over a balanced cable.
Note: The TMDS Interface is optional. It is sometimes included as standard equipment
when VBOB is purchased with TMDS-related products, such as HD GVO.