KAT5 User Guide


This document is a DRAFT issue and subject to change.

INDIGO Electronics - DIY Home Automation

KAT5 User Guide

KAT5 AV Transceivers are designed to allow the easy distribution of high quality Audio and Video signals over low cost Category 5 Data Cable more commonly referred to as CAT5.

This document details how to interconnect the various transceiver modules together. Please note that not all the modules mentioned in this document are currently available.

Most of the KAT5 units require a low voltage power supply. Almost any commercially available power supply can be used subject to meeting the following conditions.

  • 2.1mm DC Power Plug with the Centre Pin POSITIVE (+ve)
  • 12V DC REGULATED @ 300mA or 9V DC UNREGULATED @ 300mA

Power supplies meeting the above requirement can be found in many supermarkets and DIY stores for between £3-00 and £6-00.


AVS-TX  KAT5 AVS Transmitter (Yellow Power LED)

This module is connected to the output of the source equipment e.g. VCR, DVD Player, Satellite Receiver etc. It can be used for

  • S-Video + Stereo Audio
  • Composite Video + Stereo Audio
  • 2 separate Composite Video + Mono Audio sources.
    (See the section on CUSTOM CONFIGURATIONS for more information.)
Connect the SCART socket on the AVS Transmitter to the output of your source equipment. If this is NOT a SCART socket please see the section on CONNECTOR TYPES. If you need to connect more than 1 device to your source equipment please see the section on PARALLEL CONNECTION.

Connect the CAT5 cabling to the RJ45 socket on the AVS Transmitter. Connect the Power Supply to the power socket on the AVS Transmitter.


AVS-RX  KAT5 AVS Receiver (Red Power LED)

This module is connected to the input of the destination equipment e.g. TV, Monitor, Projector etc. (See also SCART SWITCHING) It can be used for

  • S-Video + Stereo Audio
  • Composite Video + Stereo Audio
  • 2 separate Composite Video + Mono Audio sources.
    (See the section on CUSTOM CONFIGURATIONS for more information.)
Connect the SCART socket on the AVS Receiver to the input of your source equipment. If this is NOT a SCART socket please see the section on CONNECTOR TYPES.

Connect the CAT5 cabling to the RJ45 socket on the AVS Transmitter. Connect the Power Supply to the power socket on the AVS Transmitter.


AVS-VC  KAT5 AVS Video Conference (Green Power LED)

This module allows one Composite Video + Mono Audio signal to be sent in each direction simultaneously. It is intended for use in the following applications.

  • Video Conferencing.
  • Door Entry Systems - with Video Camera/Monitor and 2 way Audio.
  • AV Distribution and CCTV - e.g. Sending Composite Video and Mono Audio to TV and using the return channels for a CCTV camera to monitor the room (Pubs, clubs and public areas etc).
The use of this module will almost certainly require a cable other than a standard SCART lead. In addition, because this module is bi-directional, a specially "crossed" CAT5 cable will be required if not used with a KAT5 Switcher. Please see the sections on SCART SWITCHING and CUSTOM CONFIGURATIONS.


SCART SWITCHING

The SCART specification allows for externally connected equipment to seize control of a TV and automatically display the external signal. You probably already have this happen when you use your Sky Digibox or VCR on your main TV.

The AVS-RX and AVS-VC also have the ability to seize control of your TV. There is an internal link located near the DC Power Socket which can be configured in one of 3 ways.

Auto Switching DISABLED Default as supplied.

To disable the Auto Switching the link should either be removed or fitted over a single pin only.

NOTE: If the link is fitted, the KAT5 will seize control of the TV whenever power is applied to the KAT5 Unit.
Most TV's will allow this to be overridden by the remote control to allow viewing of UHF TV broadcasts.


 
Auto Switching FULL SCREEN

With the link fitted in the lower position, pin 8 of the SCART will output 12 volts and force the TV to display the signal from the KAT5 AVS.


 
Auto Switching WIDE SCREEN (16:9 Mode)

With the link fitted in the upper position, pin 8 of the SCART will output 5 Volts and force the TV to display the signal from the KAT5 AVS in a Letterbox (16:9) format rather than the conventional (4:3) format.

NOTE: Not all TV's will support this option as it is an amendment to the original SCART specification. TV's that do not support 16:9 switching will show the picture full screen which will make people look tall and thin !


 
Use the widescreen option when your Main TV is a widescreen set and all your source equipment is set to widescreen mode. This will enable your older 4:3 sets to display a geometrically correct letterboxed picture.

NOTE: The SCART specification does not include a function for automatic switching between S-Video and Composite Video modes. (Like Widescreen, S-Video was an amendment to the original specification.) Most TV's have either a Menu or Remote Control option to configure an input as Composite or S-Video. Once set, most TV's will remember the current setting.


CONNECTOR TYPES

AUDIO CONNECTORS

Most AV equipment will use either SCART or Phono (RCA) connectors for audio connection. The pinout for a SCART connector is shown in the Appendix. Phono connectors are normally colour coded as follows

  • Left Audio Channel - WHITE (Occasionally Black on older equipment)
  • Right Audio Channel - RED
Occasionally other connectors may be used for audio, please consult your equipment user guide for the correct connections.

VIDEO CONNECTORS

Composite Video

  • SCART - See Appendix
  • Phono - YELLOW
  • BNC - found on Professional grade equipment and older consumer equipment
S- Video (also known as Y/C Video)
  • SCART - See Appendix
  • 4 pin MiniDin - See Appendix
  • 2 x BNC - Will normally be labelled as Y and C on professional equipment.
Commercially made leads should be available for most configurations from AV retailers. If you require a purpose made lead, the required pinouts are shown below.

KAT5 AVS Receiver
Using connectors to match the inputs of your equipment, these are the connections to be made in the SCART Plug. Remember to use screened cable for all connections.

KAT5 AVS Transmitter
Using connectors to match the outputs of your equipment, these are the connections to be made in the SCART Plug. Remember to use screened cable for all connections.

KAT5 AVS Video Conference
Using connectors to match the inputs and outputs of your equipment, these are the connections to be made in the SCART Plug. Although separate leads are shown for Left and Right Audio on both input and output, the AVS-VC only carries a MONO audio signal. A stereo input signal will be mixed down to mono. Both channels of a Stereo TV will be fed with the same MONO signal ensuring that audio is available from all speakers. Remember to use screened cable for all connections.


PARALLEL CONNECTION

Whilst an Audio Output may be connected to several Audio Inputs with little or no noticable effects other than a slight drop in volume, the same is NOT true of a video signal. A video signal must be correctly terminated by a 75 ohm resistor. This is built into all video equipment including the KAT5 modules.

If you attempt to connect more than one piece of video equipment to an output the signal will not be correctly terminated. Most domestic AV equipment is fairly tolerant of this and in many cases the only noticable effect will be a slight loss of brightness in the picture.

Professional equipment however adheres strictly to the specifications and hence is much more demanding. An incorrectly terminated video signal will suffer from one or more of the following defects

  • Very bright picture with "washed out" colours (no termination)
  • Very dark picture with lack of definition (multiple termination)
  • Severe ghosting giving multiple images (no termination)
  • Loss of synchronisation causing picture roll or jitter (multiple termination)
There are two ways to address the problem
  1. Use a video distribution amplifier to split the signal into the required number of devices to ensure correct termination (This can be very expensive)
  2. Loop the signal through the devices with only the last device being terminated. This requires specially made cables and equipment that allows the termination to be removed. (Appendix has details on how to modify a KAT5 AVS-TX for loop through operation)


CUSTOM CONFIGURATIONS

KAT5 technology has been designed from the outset to be the most flexible AV distribution system available. If you have an AV distribution requirement that is not covered by the standard modules currently available please contact us with details of your requirements.

KAT5 can be built to accommodate any of the following Signal Types

  • 4 Audio
  • 3 Audio + 1 Video
  • 2 Audio + 2 Video
  • 1 Audio + 3 Video
  • 4 Video
KAT5 can be built to accommodate any of the following Signal directions
  • 4 send
  • 3 send + 1 receive
  • 2 send + 2 receive
  • 1 send + 3 receive
  • 4 receive
KAT5 can be built to use whatever type of connector you need for your application.

APPENDIX TO FOLLOW !!!! With diagrams etc………

Whilst as much care as possible has been taken with these designs, due to the complex and diverse nature of the equipment connected by the user it is impossible to guarantee that all equipment will operate correctly in every case.

END OF DOCUMENT


Return to KAT5.tv - High Quality AV Distribution

Website Content and Design is protected under Copyright by Keith Doxey ©2002
This page last updated : 19th October 2002