Key Digital KD-FIX418 Operating Instructions Manual page 6

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Control Rotary:
Choose the desired setting for hot plug detection control,
bandwidth compression/decompression, and boost mode.
Power cycle unit after changing settings.
Forced HPD On/Bypass
In cases of many layers of connectivity or non-standard
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devices in-line, hot plug detection (HPD) may be lost or
drop below standard levels, leading to the video source
not detecting a display/sync device and not outputting a signal. A display device may
also not detect a connected source in cases of failed hot plug detection.
If set to On, Hot Plug Detection (HPD) voltage is forced at the HDMI input connection
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of the KD-FIX418. The connected source device will be fed a constant voltage to
inform the device that a partner (output/display) is always connected and active.
If set to Bypass, Hot Plug Detection (HPD) voltage is bypassed from connected output/
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display to the input/source
Bandwidth Compression
KD-FIX418 can be set to compress or decompress the TMDS (audio and video) signal
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enabling 18Gbps video signals to be extended via legacy 10.2Gbps cabling.
IMPORTANT: COMPRESSION/DECOMPRESSION REQUIRES
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TWO (2) KD-FIX418 UNITS
One (1) unit set to Compression mode (typically at video source)
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One (1) unit set to Decompression mode (typically at video display)
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Modes
Bypass: No compression applied
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Auto Compress
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Compresses 18Gbps video signals to 10.2Gbps.
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Must be paired with 2nd KD-FIX418 unit to decompress signal for acceptance by
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video display
No compression applied to ≤ 10.2Gbps signals
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Compress
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Compression applied to all signals (18Gbps, 10.2Gbps, <10.2Gbps)
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Resultant signal bandwidth is ½ original signal bandwidth
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Must be paired with 2nd KD-FIX418 unit set to Decompress mode for acceptance
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by video display
Decompress/ Auto Down-Convert
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Decompress: Restores compressed signal to 18Gbps for acceptance
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by video display
Must be paired with 2nd KD-FIX418 unit set to Compress mode
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Auto Down-Convert: Down converts all signal > 10.2Gbps
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Resultant down-converted signal is 4K@60 [4:2:0] 8bit (10.2Gbps)
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Down-convert mode works independently.
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Does not require 2nd KD-FIX418 unit.
Input Boost
When set On, EQ levels of the HDMI input are set HIGH
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Slightly degraded signals (ie pixel loss, flickering image) may be resolved
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Severely degraded signals may be improved, but may not be completely resolved
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Use shorter length HDMI cables for best results
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Maximum one active/directional HDMI cable may be used.
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KD-FIX418 should be installed at display side for these instances
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