Thinklogical Q-4300 Video Modules Manual - Manual (Page 52)

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Q - S e r i e s V i d e o M o d u l e s P r o d u c t M a n u a l , R e v . I Page 52
Appendix F: EDID and DDC for Standard and HDCP Modules
Display Data Channel (DDC) is a VESA standard transport medium between a CPU’s graphics adapter and
monitor used to pass EDID, and can be either unidirectional or bidirectional.
A bidirectional bus supports content protection (HDCP) and display calibration software. (High-bandwidth
Digital Content Protection is a specification used to encrypt and protect digital video and audio signals transmitted
between two HDCP-enabled devices.)
NOTE: Most DVI-D graphics adapters will not boot if a valid EDID table is not received at power up.
E
xtended
D
isplay
I
dentification
D
ata (EDID)
is a data structure provided by a digital
display to describe its identity ( manufacturer’s name, product type, serial number, etc.) and capabilities (native timing,
frequency range, video and audio formats, etc.) to a video source.
EDID is what enables a modern personal computer to know what kind of monitor is connected.
With this information the CPU and video card can determine what resolutions the monitor is capable of.
EDID is defined by a standard published by the Video Electronics Standards Association (VESA). The
EDID also includes such information as the phosphor or filter type, timings supported by the display,
display size, luminance data and pixel mapping data for digital displays.
!
Feature
Remote
Dynamic
Remote
Static
Pass-Thru
Local
Static
Load
Default
Supports HDCP
Supports Monitor calibration
Monitor on Rx side
required to boot video
EDID table loaded from Rx
EDID table loaded from Tx
EDID table stored in
non-volatile memory
Yes
No
No
Yes
No
No
Yes
No
No
Yes
No
No
No
No No No No
No
No
No
No
No
Yes Yes No
Yes
Yes Yes Yes Yes
Feature
Remote
Dynamic
Remote
Static
Pass-Thru
Local
Static
Load
Default
Supports HDCP
Supports Monitor calibration
Monitor on Rx side
required to boot video
EDID table loaded from Rx
EDID table loaded from Tx
EDID table stored in
non-volatile memory
No
No
No
No
No
No
No
No
No
No
No
No
No
No No No No
No
No
Yes
Yes
Yes
Yes Yes No
Yes
Yes Yes Yes Yes
Standard Models EDID Table
H Models (HDCP Compliant) EDID Table
When placed in DDC Pass-thru mode, Thinklogical fiber optic extenders act as a wire between the HDCP
video source and sink device. Whether they tolerate this extension is dependent upon the sink and source's
implementation of the HDCP negotiation protocol. Thinklogical has extended HDCP compliant devices up to
200m in the past, but cannot guarantee the same performance in every installation.