Extron electronic TPX 88 manual Equalizing pair skew with Skew Equalizers, Installation, cont’d

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Equalizing pair skew with Skew Equalizers

Installation, cont’d

The Microtest OMNI SCANNER 2 performs comprehensive certification testing to the proposed CAT 6 standards. Other manufacturers also make testing equipment. The tests include advanced diagnostics for troubleshooting the cause and location of many cable and termination problems. For simple installation testing, the Microtest MICRO SCANNER PRO tests wire map and cable length, including individual cable pair length.

The manufacturing process for network (CAT 5) UTP 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.

Pair skew can be measured with test equipment. UTP cable test equipment measures and reports wire pair length. In certain circumstances, the report on the various pair lengths can be used in equalizing pair skew.

If test equipment is not available, skew can be identified by viewing a crosshatch test pattern with a critical eye to determine if either the red, green, or blue video image leads (appears to the left of) the other two video images.

For best results when using CAT 5 cable in A/V applications, pair skew needs to be equalized. Extron suggests several ways to equalized the pair skew as follows.

The design of Extron’s Skew-Free A/V UTP cable minimizes pair skew to the point that equalization is not required.

If there are different cable types and/or big differences in input cable length, skew compensation will not work.

Equalizing pair skew with Skew Equalizers

Try using the following methods to minimize or eliminate pair skew:

•If using MTP 15HD (RGB video) receivers, switch to SEQ versions of the receivers.

•Install separate SEQ 100 15HD or SEQ 100 BNC Skew Equalizers on the receivers’ video outputs and adjust the skew for the leading video image.

Equalizing pair skew with skew compensation cables

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 TP cable is very close to that of conventional coaxial cable. The similarity in NVP means that, when all transmitter cables systems use the same cable type and are approximately equal in length, by adding an additional length of coax, equal to the length of pair skew, placed on the receiver’s output, you can equalize the effects of pair skew (figure 2-4).

If UTP cable test measurement cannot be done, pair skew can still be equalized, assuming that all of the transmitter cable systems are equal, by viewing a crosshatch test pattern with a critical eye. Examine the test pattern for loss of horizontal registration and, through a process of trial and error, equalize any pair skew with coax extensions on the red, green, and/or blue outputs.

Extron skew compensation coax cables are available in lengths of 2 through 20 feet, see Appendix A for part numbers.

2-6 TPX 88 Matrix Switchers • Installation

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Contents TPX 88 and TPX 88 A 68-733-01 Rev. CPrecautions Safety Instructions EnglishConsignes de Sécurité Français Sicherheitsanleitungen DeutschQuick Start - TPX Matrix Switchers Configuration - One or more ties or sets of tiesTPX 88 Matrix Switcher Quick Start QS-1 InstallationQuick Start - TPX 88 Matrix Switchers, cont’d Save or recall a presetQS-2 TPX 88 Matrix Switchers Quick Start Create a tieTable of Contents TPX 88 Matrix Switchers Table of ContentsTable of Contents, cont’d ii TPX 88 Matrix Switchers Table of ContentsSpecifications Appendix A Reference InformationPart Numbers Button Labelsiv TPX 88 Matrix Switchers Table of Contents TPX 88 Twisted Pair Matrix Switchers About Both TPX Switcher Models About the TPX 88 A Switchers FeaturesChapter1One Introduction1-2 TPX 88 Matrix Switchers Introduction Introductiontroduction, cont’dAbout the TPX 88 Manual About the TP A/V SystemTPX 88 Matrix Switchers Introduction Extron twisted pair products’ attributesFamily Model1-4 TPX 88 Matrix Switchers Introduction Introduction, cont’dExtron twisted pair products’ attributes continued MTP ReceiversTransmission distances Recommended transmission ranges at 60 HzVideo format Maximum rangesAbout Both TPX Switcher Models Figure 1-1 - Typical TPX 88 A matrix switcher application1-6 TPX 88 Matrix Switchers Introduction About the TPX 88 A Switchers Features 1-8 TPX 88 Matrix Switchers IntroductionFigure 1-2 - Audio gain and attenuation Any input to any or all outputs Audio from a transmitter in the MTP family cannot be broken away1-10 TPX 88 Matrix Switchers Introduction Installation Mounting the Switcher Cabling and Rear Panel ViewsChapter2Two Installationstallation, cont’d Mounting the SwitcherFigure 2-1 - Rack mounting a TPX switcher 2-2 TPX 88 Matrix Switchers InstallationFigure 2-2 - TPX 88 A twisted pair matrix switcher with audio TPX 88 Matrix Switchers InstallationCabling and Rear Panel Views Installation, cont’d Remote configuration DIP switches - Set these DIP switches to2-4 TPX 88 Matrix Switchers Installation Termination of TP cableThe TPX 88 A switches and processes wire pair 3 and Cable testing2-6 TPX 88 Matrix Switchers Installation Equalizing pair skew with Skew EqualizersEqualizing pair skew with skew compensation cables Audio outputs connectors TPX 88 A only Figure 2-5 - Captive screw connector wiring for audio outputFigure 2-4 - Pair skew equalization Remote port configuration Figure 2-6 - Typical audio connectorsFigure 2-7 - Remote connector 2-8 TPX 88 Matrix Switchers InstallationFront Panel Controls and Indicators Operations Troubleshooting Chapter3ThreeOperation WorksheetsFront Panel Controls and Indicators 3-2 TPX 88 Matrix Switchers OperationOperationeration, cont’d DefinitionsTPX 88 Matrix Switchers Operation Control buttons3-4 TPX 88 Matrix Switchers Operation Operation, cont’dI/O controls TPX 88 A only Audio controls TPX 88 A onlyPower OperationsButton icons Figure 3-3 - Sample button icons3-6 TPX 88 Matrix Switchers Operation I/O groupingCreating a configuration 3-8 TPX 88 Matrix Switchers Operation 1 2 3 4 5 6 7 1 2 3 4 5 6 7Example 1 Creating a set of video and audio ties Figure 3-5 - Select video and audioFigure 3-8 - Press the Enter button Example 2 Adding a tie to a set of video and audio tiesFigure 3-9 - Select video only Figure 3-10 - Select an input3-10 TPX 88 Matrix Switchers Operation Figure 3-11 - Select the outputFigure 3-12 - Press the Enter button Example 3a Removing an audio tie from a set of ties TPX 88 A onlyN 1 2 3 4 5 6 7 Figure 3-14 - Select an inputFigure 3-15 - Deselect the output 1 2 3 4 5 6 73-12 TPX 88 Matrix Switchers Operation Example 3b Removing a tie from a set of ties TPX 88 onlyFigure 3-17 - Select an input Press and release the output 4 button figureViewing a configuration Example 4a Viewing ties TPX 88 A onlyFigure 3-20 - Select view mode 3-14 TPX 88 Matrix Switchers Operation Figure 3-21 - Select video and audioFigure 3-22 - Select an input Figure 3-23 - Deselect audio to view video only Figure 3-24 - Deselect video and select audio to view audio onlyFigure 3-25 - Press the View button to exit view mode 3-16 TPX 88 Matrix Switchers Operation Example 4b Viewing ties TPX 88 onlyFigure 3-26 - Select view mode Figure 3-27 - Select an inputUsing presets Example 5 Saving a presetFigure 3-29 - Enter save preset mode Figure 3-28 - Press the View button to exit view modeFigure 3-30 - Select the preset Example 6 Recalling a presetFigure 3-32 - Select recall preset mode 3-18 TPX 88 Matrix Switchers OperationFigure 3-33 - Select the preset Viewing and adjusting the input audio level TPX 88 A only Example 7 Viewing and adjusting an input audio levelFigure 3-35 - Select audio view and adjust mode 3-20 TPX 88 Matrix Switchers OperationFigure 3-37 - Adjust the input audio level 1 2 3 4 5 6 7B1 2 3 4 5 6 7 Figure 3-36 - Select an inputViewing and adjusting the output volume TPX 88 A only 3-22 TPX 88 Matrix Switchers OperationFigure 3-38 - Deselect audio mode Example 8 Viewing and adjusting an output volume level Figure 3-39 - Select audio view and adjust mode1 2 3 4 5 6 7 Figure 3-40 - Select an outputFigure 3-41 - Adjust the output audio volume 3-24 TPX 88 Matrix Switchers OperationMuting and unmuting the local audio TPX 88 A only Front panel security lockout executive modeFigure 3-43 - Muting and unmuting outputs Figure 3-44 - Toggle the front panel lock on or offSystem reset to factory defaults Figure 3-45 - System reset3-26 TPX 88 Matrix Switchers Operation Background illuminationTroubleshooting WorksheetsCamera main podium Podium MicOperation, cont’d Camera main podiumPodium Mic LaptopCamera main podium 3-30 TPX 88 Matrix Switchers Operation Configuration worksheet Preset #3-31 Title3-32 TPX 88 Matrix Switchers Operation Host-to-Switcher Instructions Switcher-Initiated Messages Switcher Error Responses Using the Command/Response TableCommand/Response Table for SIS Commands Chapter4FourHost-to-Switcher Instructions Switcher-Initiated MessagesFigure 4-1 - Remote connector pin arrangement 4-2 TPX 88 Matrix Switchers Programmer’s GuideSwitcher Error Responses TPX 88 Matrix Switchers Programmer’s GuideUsing the Command/Response Table Symbol Definitions4-4 TPX 88 Matrix Switchers Programmer’s Guide Programmer’s Guide, cont’dCommand/Response Table for SIS Commands CommandASCII Command ResponseCommand/response table for SIS commands Cont’d 4-6 TPX 88 Matrix Switchers Programmer’s GuideASCII Command Audio output volumeSave, recall and direct write global presets ResetsI/O Grouping Executive mode4-8 TPX 88 Matrix Switchers Programmer’s Guide Resets continuedView ties, gain, volume, and presets Information requestsMatrix Switchers Control Program Button-Label Generator Chapter5FiveMatrix Software Matrix Switchers Control Program Installing the softwareUsing the software 5-2 TPX 88 Matrix Switchers Matrix SoftwareFigure 5-1 - Extron Matrix Switcher+ Control Program window blank TPX 88 Matrix Switchers Matrix SoftwareFigure 5-2 - Sample program window complete Firmware upgrade 5-4 TPX 88 Matrix Switchers Matrix SoftwareMatrix Software, cont’d Figure 5-3 - Open windowWindows buttons, drop boxes, and trash Windows menusFile menu Tools menu5-6 TPX 88 Matrix Switchers Matrix Software Preferences menuFigure 5-4 - Ties shown as crosspoints Using emulation mode Using the help system5-8 TPX 88 Matrix Switchers Matrix Software Button-Label GeneratorFigure 5-5 - Extron’s Button-Label Generator window Specifications Part Numbers Button Labels AAppendix AReference Information Specifications A-2 TPX 88 Matrix Switchers Reference InformationReferenceInformation,co t’d VideoControl/Remote - switcher TPX 88 Matrix Switchers Reference InformationGeneral Twisted Pair Matrix Switcher part numbers Optional accessoriesA-4 TPX 88 Matrix Switchers Reference Information Reference Information, cont’dRJ-45 connectors Skew compensation cableInstalling labels in the matrix switcher’s buttons A-6 TPX 88 Matrix Switchers Reference InformationButton Labels Figure A-1 - Button label blanks A-8 TPX 88 Matrix Switchers Reference Information
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