Abstract: High-Frequency Reference Design (HFRD)-34.0 is a fully buffered 4 x 4 DVI KVM switch. The design switches high-resolution DVI video (up to 1920 x 1200 resolution), analog audio, and USB signals from one to four inputs to one to four outputs. HFRD-34.0 supports both video and audio fanout operation (one source to multiple outputs). The reference design also provides 1:2 hubs on each USB port for keyboard and mouse connections of up to four different users. All signals are fully buffered, allowing extended connection distances. Additionally, equalization is provided on all DVI data input signals and adjustable preemphasis on all DVI data outputs. All control and configuration selections are made through a simple navigational switch and LCD display.
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