Extron electronic CAT 6 User Manual

User’s Guide

www.extron.com

Extron Electronics, USA

1230 South Lewis Street
Anaheim, CA 92805
USA

714.491.1500
Fax [phone]

Extron Electronics, Europe

Beeldschermweg 6C
3821 AH Amersfoort
The Netherlands
+31.33.453.4040
Fax [phone]

© 2002 Extron Electronics. All rights reserved.

Extron Electronics, Asia

135 Joo Seng Road, #04-01
PM Industrial Building
Singapore 368363
+65.6383.4400
Fax [phone]

Extron Electronics, Japan

Daisan DMJ Building 6F
3-9-1 Kudan Minami
Chiyoda-ku, Tokyo 102-0074 Japan
+81.3.3511.7655
Fax [phone]

CAT 6 Install Kit

CAT 6 Patch Cable and Coaxial Skew Cables

68-600-01 Rev. B

Printed in the USA

03 02

Overview

The Extron CAT 6 Installation Kits include a pretested, plenum or
non-plenum, Category 6 (CAT 6) patch cable and whatever
coaxial skew cables are necessary to correct measured pair skew.
The CAT 6 cable is preterminated with RJ-45 plug connectors.
The coaxial skew cable is color coded (red, green, or blue jacket)
and is preterminated with BNC connectors.

Termination of CAT 6 Cable

Figure 1 details how the CAT 6 cables in the Installation Kits are
terminated in accordance with the TIA/EIA T 568A wiring
standards.

Clip DownSide

12345678

1

2345678

1&2

3&6 4&5

Figure 1 — CAT 6 cable termination

RJ-45 connector

Pin Wire color

1 White-green Red/V. sync+ ±0.35V

2 Green Red/V. sync- ±0.35V
3 White-orange
4 Blue Green+ +0.35V

5 White-blue Green- -0.35V
6 Orange
7 White-brown Blue/H. sync+ ±0.35V

8 Brown Blue/H. sync- ±0.35V

RGB video and audio

Signal Level

Audio &
power

Audio &
power

Twisted Pairs

7&8

+15V with
±0.5 V

±0.5 V

feet or less should exhibit no transmission problems if they pass
CAT 6-D5 channel certification testing.

Equalizing Pair Skew

The manufacturing process for CAT 6 cable leads to a condition
called pair skew. Skew exists between pairs when the physical
length of one wire pair is different from another. As the
transmission cable length increases, the amount of skew
increases. Skew affects the displayed image when the differential
length between wire pairs exceeds 2 feet, causing the timing of
the red, green, and blue video signals to appear out of alignment
(horizontal registration errors). A white vertical line on a black
field can appear as individual red, green, and blue lines that are
close together; the signal transmitted on the shortest wire pair
leads the other colors and appears to the left on the display.

CAT 6 cable test equipment measures and reports wire pair
length. The report on the various pair lengths can be used in
equalizing pair skew. The nominal velocity of propagation (NVP
— the speed at which the signal travels on the transmission line,
measured as a percentage of the speed of light) of CAT 6 cable is
very close to that of conventional coaxial cable. The similarity in
NVP means that an additional length of coax equal to the length
of pair skew, placed on the receiver’s output, equalizes the effects
of pair skew (figure 2).

The installation kit includes skew compensation cable(s) that
compensate(s) for the level of skew observed in testing at Extron.

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ID PIN 4

T

ID PIN 11

B
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F
F

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D

L
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A

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­S

M

H

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Audio

R

IF cable measurement

indicates that the pair

1 and 2

with wires

I
F

T

T

P

T

1

5

H

D

A

four feet shorter than
the other pairs...

is

Cable Testing

To ensure proper cable termination, each transmission cable sold
as part of an Installation Kit is tested from end to end to give an
accurate indication of cable quality.

A complete test measures cable length and tests the wire map,
attenuation, NEXT, PSNEXT, ELFEXT, PSELFEXT, return loss,
ACR, and PSARC. All of these tests are critical for digital data
transfer. 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 termination)
and pair length measurements. The largest concern is
equalization of skew between cable pairs. Cable systems of 300

PC Computer

Pair RGB video

1, 2 Red

4, 5 Green

CAT 6 Cable

... THEN insert a four foot

extension cable to equalize

TP skew for red video.

7, 8 Blue

Figure 2 — Pair skew equalization

CAT 6 Install Kit • Equalizing Pair SkewCAT 6 Install Kit • Cable Testing

R

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W

D

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A

P

5

.
V
5
1

R

B

DIO

L

AU

A

L

R

C SYNC

SOG

V

TP R BNC A

H/HV
OUTPUT

RGB

B

G

R

RGB INPUT

LCD Projector

32