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INSTALLATION
3
CONFIGURATIONOPERATION
FURTHER
INFORMATION
INDEX
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
Tips for achieving good quality links for further information. Please also see Tested video
resolutions.
On the front panel, the HR indicator will illuminate when High Rate mode is available,
whereupon the second video port is enabled and the total 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 Identication 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 sufcient bandwidth does not
exist for the modes declared by the second display, then it will not be reported to the
host PC. Please see Appendix B for details about how the EDID details supplied by each
display are managed.
Notes:
• The AdderLink XD522 is not recommended for use with the NVIDIA Quadro FX 3800
graphics card. Please contact Adder technical support for more information.
• 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 gures 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
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:
Priority mode
(Hotkey option 7) A
single WQXGA mode
display could consume
nearly all of the port 1
bandwidth alone, or...
... Balanced mode
(Hotkey option 6) Two
WUXGA mode displays
could share the total
evenly.
See “Using hotkeys”
on page 22 for more
details.