Advanced Edid Management; Hdcp Management; Protected And Unprotected Content - Lightware HDMI-TPS-TX210 User Manual

3.2. Advanced EDID management

Each DVI 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 standard makes use of EDID data structure for the identification of the monitor type
and capabilities. Most DVI sources (VGA cards, set top boxes, etc.) will output DVI signal
after accepting the connected sink's EDID information. In case of EDID readout failure or
missing EDID, the source will not output DVI video signal.
The transmitters provide Lightware's Advanced EDID Management function that helps
system integration. The transmitter's built-in memory stores and emulates pre-programmed
factory EDIDs, user's EDID and the monitor's EDID that is connected to the receiver. The
transmitter stores the EDID of the attached monitor or projector 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 HDMI / DVI / DP input can be copied from the transmitter's
memory (static EDID emulation), or from the last attached monitor's memory (dynamic
EDID emulation). For example, the transmitter can be set up to emulate a device, which is
connected to the receiver's DVI output. In this case, the EDID is automatically changed, if
the monitor is replaced with another display device (as long as it has a valid EDID).
Advanced EDID management can be controlled via Lightware Device Controller.
Info: The user is not required to disconnect the HDMI / DVI / DP cable to change an EDID as
opposed to other manufacturer's products. EDID can be changed even if source is
connected to the input and powered ON.
Info: When EDID has been changed, the transmitter toggles the HOTPLUG signal for 2 seconds.
Some sources do not observe this signal, so in this case the change is not recognized by
the source. In such cases, the source device must be restarted or powered OFF and ON
again.

3.3. 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 extenders allow to transmit 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.

3.3.1. 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 a HDCP capable
device (e.g. an extender-pair) 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
enabling/disabling function: the HDCP capability can be disabled on the extenders. If
HDCP is disabled, the connected source will detect that the sink is not HDCP capable, and
turn off authentication.
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avoid unnecessary HDCP encryption, Lightware introduced the HDCP
Section 3. Technologies