Kramer Electronics tp-145 Shielded Twisted Pair/Unshielded Twisted Pair, Defining the Edid

Overview

and RS-232 control signals. The TP-145and TP-146together form a computer graphics/audio/control data line transmitter/receiver system.

More specifically, the products feature:

•Resolution up to WUXGA 1920 x 1200

•HDTV compatibility

•EDID capture and status indication (TP-145)

•Simultaneous unbalanced stereo and S/PDIF (24-bit 48kHz) audio outputs (TP-146)

•Level (gain) and EQ (peaking) controls (TP-146)

•Full duplex RS-232 transmission

•Increased level of protection against noise, spikes, and interference in adverse environments

•System range up to 200m (656ft)

3.1Shielded Twisted Pair/Unshielded Twisted Pair

We recommend that you use Shielded Twisted Pair (STP) cable. There are different categories of STP cable available and we advise you to use the best quality STP cable that you can afford. Our non-skew-free cable, Kramer BC-STPis intended for digital signals and for analog signals where skewing is not an issue. For cases where there is skewing, our Unshielded Twisted Pair (UTP) skew-free cable, Kramer BC-XTP, may be used. Bear in mind though, that we advise using STP cables where possible, since the compliance to electromagnetic interference has been tested using STP cables.

Although UTP cable might be preferred for long range applications, the UTP cable should be installed as far as possible from electric cables, motors, and so on, which often create electrical interference.

However, since the use of UTP cable might cause non-conformity to electromagnetic standards, Kramer does not commit to meeting the standard with UTP cable.

3.2Defining the EDID

EDID (Extended Display Identification Data1) is a data-structure that the display provides to describe its capabilities to a graphics card connected to the display’s source. The EDID enables the source, such as a PC, to “know” what kind of monitor is connected to the output.

The EDID includes information, such as, the name of the manufacturer, product type, timing data supported by the display, display size, luminance data, and (for digital displays only) the pixel mapping data.

1 EDID is defined by a standard published by the Video Electronics Standards Association (VESA)

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