Page 16 / 119 Section 3. Technologies
3.3. Advanced EDID Management
Each DVI/HDMI sink (e.g. monitors, projectors, plasma displays, and switcher inputs) must
support the EDID data structure. Source BIOS and operating systems are likely to query
the sink using DDC2B protocol to determine what pixel formats and interface are supported.
DVI/HDMI standard makes use of EDID data structure for the identification of the monitor
type and capabilities. Most DVI/HDMI sources (VGA cards, set top boxes, etc.) will output
DVI/HDMI signal after accepting the connected sink’s EDID information. In the case of
EDID readout failure or missing EDID, the source will not output DVI video signal.
MMX6x2-HT matrices provide Lightware’s Advanced EDID Management function that
helps system integration. The built-in memory stores and emulates pre-programmed
factory EDIDs, user’s EDID and the monitor's EDID that is connected to the output. The
EDID of the attached monitor or projector is stored in a non-volatile memory. This way the
EDID from a monitor is available when the monitor is unplugged or switched off.
The EDID emulated on the input can be copied from the memory of the matrix (static EDID
emulation) or from the attached monitor (dynamic EDID emulation). For example, the matrix
can be set up to emulate the device, which is connected to the output, and the EDID
automatically changes, if the monitor is replaced with another display device (as long as it
has a valid EDID).
INFO
The user is not required to disconnect the video cable to change an EDID as opposed to
other manufacturer’s products. EDID can be changed even if the source is connected to
the input and powered ON.
ATTENTION!
When the emulated EDID has been changed, the device toggles the HOTPLUG signal for
2 seconds. Some sources do not observe this signal; in this case, the change is not
recognized by the source. The source device must be restarted or powered OFF and ON
again.
3.4. HDCP management
Lightware Visual Engineering is a legal HDCP adopter. Several functions have been
developed which help to solve HDCP related problems. Complex AV systems often have
both HDCP and non-HDCP components. The matrix allows transmitting HDCP encrypted
and unencrypted signals. The devices will be still HDCP compliant as they will never output
an encrypted signal to a non-HDCP compliant display device. If an encrypted signal is
switched to a non-compliant output, a red screen alert or muted screen will be shown.
3.4.1. Protected and unprotected content
Many video sources send HDCP protected signal if they detect that the sink is HDCP
capable – even if the content is not copyrighted. This can cause trouble if an HDCP capable
device is connected between the source and the display. In this case, the content cannot
be viewed on non-HDCP capable displays and interfaces like event controllers. Rental and
staging technicians often complain about certain laptops, which always send HDCP
encrypted signals if the receiver device (display, matrix router, etc.) reports HDCP
compliancy. However, HDCP encryption is not required all the time e.g. computer desktop
image, certain laptops still do that.
To avoid unnecessary HDCP encryption, Lightware introduced the HDCP
enabling/disabling function: the HDCP capability can be disabled in the matrix. If HDCP is
disabled, the connected source will detect that the sink is not HDCP capable, and turn off
authentication.
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