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Repeaters extend DVI/HDMI signal transmission

Posted: 03 Oct 2007 ?? ?Print Version ?Bookmark and Share

Keywords:HDMI? DVI? repeaters? signal transmission?

TranSwitch Corp. has announced the first in a new line of devices for transmission of high-bandwidth digital video over CAT-5 or HDMI copper cables. The company's TransPHY-PXL repeater devices extend Transition Minimized Differential Signaling (TMDS) channels for any Digital Visual Interface (DVI) or HDMI digital video connection. The TransPHY-PXL repeaters can increase the distance of DVI/HDMI signal transmission significantly over standard CAT-5 cable for flat-panel displays, projectors, DVD players, STBs and other audio/video sources.

TranSwitch offers two TransPHY-PXL repeater devicessingle channel (TXC-42382) and dual channel (TXC-42384). These devices monitor the quality of the received signal using a, proprietary Signal Quality Indicator (SQI) that optimizes the signal through a rich set of adjustable link parameters. This includes multiple pre-emphasis and amplitude levels on the transmit side, adjustable equalization on the receiver side and impedance control on both sides, for each of the serial channels.

"Although CAT-5 cable is not designed for use with high-speed digital video signals, tests show that the TransPHY-PXL devices enable TMDS-encoded digital video signals to be sent and received on low-cost CAT-5 cables, with longer distances possible over thicker cables like CAT-6 or CAT-7," said Amir Bar-Niv, executive director for Systems and Applications at TranSwitch Corp.

"The use of inexpensive CAT-5 cable for this application presents a number of technical challenges, such as signal skew, which is the time delay difference in each pair of wires causing the video signal components to become unaligned," continued Bar-Niv. "The TransPHY- PXL devices have a 'de-skew' feature which overcomes this problem by adding longer FIFOs that can de-skew higher delays between signals than the standard specifies."

The TransPHY-PXL devices are available today.

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