User Guide

Video support
AdderLink XD522 works hard to transfer the highest possible video
bandwidth between the transmitter and receiver units. To allow for
the differing grades of CATx links used to join the transmitter and
receiver, AdderLink XD522 periodically checks the quality of link A
(the primary cable joining the transmitter and receiver). In this way it
can accurately determine which of two video transfer modes can be
supported. Please see the rear page for details about achieving good
quality links.
On the front panel, the HR indicator will illuminate when High Rate
mode is available, whereupon the available bandwidth for video
signals is more than doubled.
The manner in which bandwidth is made available to the two video
ports differs between the Low and High Rate modes, as described
here:
EDID management
AdderLink XD522 intelligently manages the EDID (Extended Display
Identification Data) information that each video display provides
(detailing their supported resolutions) before reporting them to
the host PC. In this way AdderLink XD522 can mask the resolution
modes that cannot be supported within the available bandwidth.
The display attached to Video port 1 will always be given priority. If
sufficient bandwidth does not exist for the modes declared by the
second display, then it will not be reported to the host PC.
High rate mode
This diagram indicates how the total bandwidth of the high rate mode can
be shared between the two video ports.
Video port 1 (which has priority) may take up 280 MegaPixels per second (of the
total 308 Mpix/sec bandwidth); while port 2 can use a maximum of 154 MPix/sec
(subject to port 1 using no more than 154 MPix/sec of the available total bandwidth).
For example:
A single WQXGA
mode display could
consume nearly
all of the port 1
bandwidth alone,
or...
... two WUXGA
mode displays could
share the total
evenly.
Note: The example modes shown here are for illustrative purposes and are based
upon average requirements for current video displays. Video displays from some
manufacturers may consume more signal bandwidth than those shown here.
* All approximate video mode bandwidth figures are quoted with reduced blanking.
During low rate mode, the secondary video
port is disabled and a total bandwidth
of 148.5 MegaPixels per second is made
available to the primary video port. This
is more than enough to support a single
1080P video display.
Low rate mode
IMPORTANT: Please see the full AdderLink
XD522 user guide for safety, warranty and
regulatory information. The full user guide is
available from www.adder.com.
© 2022 Adder Technology Limited • All trademarks are acknowledged.
Part No. MAN-XD5x2-QS-ADDER • Release 1.1
www.adder.com
Front panel indicators
The six front panel indicators on each unit provide a useful guide to
operation:
• A On Main A link is connected.
Flashes Main A link is not connected.
Off No power is present.
• B On Optional B link is connected.
Off Optional B link is not connected.
• V1 On Video port 1 is connected and receiving video.
Flashes Video port 1 is connected but not receiving video.
Off Video port 1 is not connected.
• V2 On Video port 2 is connected and receiving video.
Flashes Video port 2 is connected but not receiving video.
Off Video port 2 is not connected.
• HR On High Rate mode is active.
Flashes HR mode is preferred but cannot be established, LR mode active.
Off Low Rate mode is active.
• PS On Power connected.
Flashes Upgrade error (other indicators show error code).
Off No power.
Tips for achieving good quality links
Due to the large volumes of data that must be transferred between
the transmitter and receiver, every AdderLink XD522 installation
is highly dependent upon good quality CATx cable links. Video
performance is particularly reliant on high speed communication
channels. For this reason, the AdderLink XD522 units periodically
test the link quality to determine which of two video transfer modes
can be supported: Low Rate or High Rate. Please see page 3 for
details about high and low rate video modes.
The main factors that affect link quality are:
• The length and type of CATx cable used,
• The number, length and type of intermediate patch connections,
• The quality of the cable terminations.
The table below provides a brief overview of distances that may be
achieved using different CATx cable types. Please see the full user
guide for more details.