Extron electronic IN1404XT manual Termination of TP cable, Cable testing

8RGB video transmission connector — Connect one end of a TP cable to this

RJ-45 female connector. Connect the other end of the TP cable to an optional Extron VTR001CM or other compatible Extron TP receiver. See Optional Accessories, in Appendix A, Reference Information, for compatible TP receivers.

The VTR001CM can receive RGBHV and RGSB signals from the scaler with no loss of image quality. The VTR001 CM can also receive RGsB signals from the scaler. However, the red, green, and blue video signals’ black levels are not clamped to a 0V reference, as for RGBHV or RGBS. For most displays, this is not a problem. On some displays (such as some LCD displays) however, the black levels of the red, green, and blue signals may change as the average picture level changes, resulting in an unacceptable image.

Termination of TP cable

Figure 2-5 details the recommended termination of TP cables in accordance with the TIA/EIA T 568A and TIA/EIA T 568 B wiring standards. You can use either standard, but ensure you use the same standard on both ends of the cable.

Side	Clip Down
	1 2 3 4 5 6 7 8		RJ-45 connector
		Pin	TIA/EIA T-568-A	TIA/EIA T-568-B
			Wire color	Wire color	RGB video signal
		1	White-green	White-orange	Red/V. sync+
		2	Green	Orange	Red/V. sync-
		3	White-orange	White-green	Power
		4	Blue	Blue	Green+
	1 2 3 4 5 6 7 8	5	White-blue	White-blue	Green-
		6	Orange	Green	Power
		7	White-brown	White-brown	Blue/H. sync+
		8	Brown	Brown	Blue/H. sync-

Twisted Pairs

1&27&8

3&6 4&5

Figure 2-5 — TP cable termination

Cable testing

To ensure proper cable termination, each transmission cable system that uses CAT 5 cable should be tested (Extron’s skew-free UTP cable does not need to be tested). Testing the cable from the RJ-45 connections at the transmitter and receiver gives the most accurate indications of cable problems.

There are two varieties of cable runs: simple runs, in which a single cable is terminated only at the transmitter and receiver, and complex runs, which can include patch bays and multiple terminations and lengths of cable. In either case, the entire cabling system should be tested.

A complete test measures cable length and tests the wire map, attenuation, NEXT, PSNEXT, ELFEXT, PSELFEXT, return loss, ACR and PSACR. All of these tests are critical for digital data transfer, but not for analog video. While all of these tests are important indicators of the quality of the cable termination, the most critical testing parameters for video transfer are wire map (T-568-A or B termination) and pair length measurements. The largest concern is equalization of skew between cable pairs. Cable systems of 300 feet or less should exhibit no transmission problems if they pass at least CAT 5 channel certification testing.

IN1404XT Video Scaler and Switcher • Installation 2-5