Appendix H – EDID Management/Programming
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Instruction Manual – DXLink Fiber Transmitters and Receivers
Appendix H – EDID Management/Programming
DXLink Fiber and EDID
EDID Overview
EDID (Extended Display Identification Data) is a data structure established by the Video Electronics Standards
Association (VESA) to enable plug-and-play support by enabling easy configuration of a source’s graphics
subsystem based on the capabilities of the attached display device.
EDID information includes items such as the following:
Manufacturer’s name
Product type
Supported video resolutions and refresh rates
Color space and filter chromaticity
Detailed timings
When a source is directly connected to a display device, it can use the display device’s EDID information to determine
an initial compatible video signal to send. With the source’s display controls, the user can modify this selection to
another compatible signal based on the provided EDID information.
AMX DXLink supported EDIDs
Many EDIDs can be stored on the DXLink Transmitter and the DXLink Fiber Input board for each input – HD-15
(analog) and HDMI (digital).
The AMX DXLink supported EDIDs are classified as follows:
ALL RESOLUTIONS (default for both analog and digital inputs)
WIDE-SCREEN
FULL-SCREEN
USER EDID 1
USER_EDID_MODIFIED
MIRROR OUT 1
MIRROR_OUT_LOCAL
Any one of these EDIDs can be loaded and activated for their respective input connection by using the command
VIDIN_EDID (see page 84).
When a TX is directly connected to and RX (Duplex hardware each in Bidirectional Mode), the EDID always defaults to
MIRROR OUT 1, which is the EDID of the downstream sink connected to the RX. This is true over a power cycle, a hot
plug of either cable, or reboot.
When a TX is connected to a DXLink Fiber Input Board, these EDIDs and the active EDID persist over a power cycle of
the Transmitter, the switcher, or both, as well as when the attached Transmitter is replaced with a new Transmitter.
Analog and digital EDIDs function similarly but are managed for each input independently.
Important:
For all analog (VGA) EDIDs, to detect a new EDID the source must be power cycled.
ALL RESOLUTIONS, WIDE-SCREEN, and FULL-SCREEN
These three EDIDs come preprogrammed, loaded for both analog and digital inputs. These EDIDs are fixed and
cannot
be modified. The ALL RESOLUTIONS EDID will cover most video configurations resulting in high quality video at the
displays. The other EDIDs are provided for those special cases that require refinement of the supported resolutions or
preferred timings to achieve the best image for each display.
EDID Name
Digital Description
Analog Description
ALL RESOLUTIONS
1080p preferred; Basic Audio (Default, ALL
RESOLUTIONS)
1080p preferred (Default VGA EDID, ALL
RESOLUTIONS)
FULL-SCREEN
1600x1200 preferred (FULL-SCREEN
resolutions); Basic Audio
1600x1200 preferred (FULL-SCREEN
resolutions)
WIDE-SCREEN
1080p preferred (WIDE-SCREEN resolutions);
Basic Audio
1080p preferred (WIDE-SCREEN
resolutions)
