Telex 38109-977 manual

GPI (or GPI/O)

Rack Unit(s) (RU)

Figure 4.1 The KP-32 is a good example of an advanced user station (keypanel).

General Purpose Interface or General Purpose Input/Output. This refers to logical inputs and outputs that can be wired to external devices for various purposes (hence the term “General Purpose”). Typically, these are optically isolated logical inputs and relay outputs. However, other variations exist.

A standard unit of measure used when dealing with electronic equipment racks.

1 RU = 1.75” (44.45 mm). For example: a particular piece of equipment is described as being 3 RU in height. This means that it is 5.25” (3 x 1.75”) in height. Detailed information on the specification of standard electronic equipment racks can be found in EIA RS-310**.

**International Standard from Electronics Industry Alliance. See http:\\www.eia.org.

46 H a n d b o o k o f I n t e r c o m S y s t e m s E n g i n e e r i n g

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Telex 38109-977 manual KP-32 is a good example of an advanced user station keypanel

Contents

Handbook of Intercom Systems Engineering Fine Print Table of Contents Design of Party-Line Design of Wireless Introduction to Matrix Determining Intercom Needs Page Page List of Figures Wireless Intercom Interfaced to Matrix Intercom Preface Page About the Authors Page Introduction Party-Line Systems Wireless Systems Matrix Systems Accessories Wireless Intercom Examples Example of Interfacing a TW System to a Matrix System Before We Begin Matrix Rest Of The Book Tally Two-Wire Some DefinitionsParty-Line PL systems / Conference Line Intercom Systems Short History Present Day Systems and Manufacturers Brand Name Manufacturer System Components and Their Function Belt Pack Headset User Station Functional Description Speaker User Station Functional Description Master StationsSome Technical Notes About The Stations Above How Each System Works Four pin XLRFive pin XLR System Powering Headset User StationsSpeaker User Stations Outstanding Features of Each System CablingCall Lights Limitations of Each System SummarySome Definitions Short History System Components and Their Function How Each System Works Outstanding Features of Each System Limitations of Each System Audiocom intercom concept RTS TW intercom concept Overview Defining And Meeting Your NeedsApplication 1 Generic Single Channel Systems Audiocom Party-Line Intercom Equipment Listing #1 Generic single channel Audiocom system Clear-Com Party-Line Intercom Equipment Listing #1 Generic single channel Clear-Comsystem Application 2 Two-Channel System TV, School, Cable RTS TW Party-Line Intercom Equipment Listing #1 Audiocom Party-Line Equipment Listing #2 Clear-Com Party-Line Equipment Listing #2 Application 3 Theater System RTS TW Party-Line Equipment Listing #2 Audiocom Party-Line Equipment Listing #3 Clear-Com Party-Line Equipment Listing #3RTS TW Party-Line Equipment Listing #3 Application 4 Training Systems Audiocom Clear-Com Clear-Combased training intercom system RTS TW Application 5 Medium System for Television Medium intercom system for television IFB System One Way Communications System How an IFB WorksStudio and Some Field Applications Field Application, Sports Connecting Interfacing to Other Communications Systems Field Application, ENG Electronic News Gathering Typical Interfacing Problem Interfacing Issues Level Problems Signal / Data ConversionModes Call Light Problems in Interfacing to Cameras Interfacing PracticeAlternatives for Interfacing to Television Cameras Some Practical Considerations Headset Cable Lengths Wiring Practices/Workmanship Standards Headphone ImpedancesExtended Range On Part Or All Of The System Unbalanced vs. Balanced Cable Considerations Crosstalk Through a Common Circuit GroundCrosstalk Through a Mutual Capacitance Of Two Conductors Low Crosstalk Approach To Interconnection Temperature Range Consideration System Current/System Capacitances/LoadingCooling Requirements Magnetic Fields Hum Problems Moisture / Contamination ProtectionDefining and Meeting Your Needs Connecting Interfacing to Other Communications Systems IFB System One Way Communications SystemSome Practical Considerations Page Page Introduction to Matrix Intercom Systems Definitions KP-32 is a good example of an advanced user station keypanel History of Matrix Intercoms Example of Matrix Ports X X X X X X Number of Users Number of Crosspoints Page Page Modern Day Matrix Intercoms Conventional Matrix vs. TDM Matrix Configurability Special ConsiderationsAdvantages Size Ancillary Functions Conference or PL described above More Complex Ancillary Functions Typical User Station KeypanelPage Disadvantages CostComplexity You are in your kitchen QUICK, multiply 347.2 times Page Page Back-to-Basics RTS Matrix Intercom Systems Typical Adam Matrix Connections To Begin Let’s get startedStudio a Floor Control Room OtherPage Page Cable Considerations RJ12 Modular Plug Polling Issues Audio and Data Considerations Very Large Systems, Split Operation and Trunking A Comparison of Relative System Sizes Separate Studios, Separate Intercom Fixed Trunking Page Independent Matrices in 2 Studios Page Cascaded Trunking Signal Formats Interfacing Interconnecting Matrix, PL, and Wireless Systems TW and Matrix Signal Flows 10 Wireless Intercom Interfaced to Matrix Intercom + + Software Considerations 12 TW to Matrix Interface Adam and Adam CS Basic Components Adam Page Introduction to Wireless Intercoms History of Wireless IntercomsPage Modern Day Wireless Intercoms First beltpack based wireless intercom system An example of a modern day wireless intercom system Page Ntsc Channel Configuration Chan Start Video Chroma Audio Chan Start Video Chroma Audio Page Page Design of Wireless Intercom Systems Field An example of wireless transmission and reception An example of reflected RF waves Waves that are in phase combine to form a larger wave An example of combining waves that are not 180 out of phase Interference 2A B = C + C = D3A 2B = C 10 Transmitter block diagram Transmitters and Receivers 11 Receiver block diagram 12 Good linearity is a must for faithful signal reproduction Antenna & Cable Considerations Page 14 An example of a Yagi antenna Page Installation Coaxial Cable Loss ChartPage Page Page Determining Intercom Needs Conference Versus Point-to-Point RequirementsPage Fixed vs. Mobile Requirements General Overview Determining Intercom Needs, two-wire, four-wire, or both? PS15 Power Supply/MCP2 Rack KitSmall Studio or ENG Vehicle MCE325 Modular Programmable Station Headsets and Earsets not shown Medium Sized Studio and Mobile IntercomTW5W Splitter IFB325 Talent User Station Two-wire Case Medium Intercom 803-G1G5 Master Station PS31 Power Supply BOP220 Connector Translation AssemblySystem Interconnect SAP1626 Source Assign Panel Four-wire Case Medium Intercom Zeus DSP2400 Matrix KP96-7 KeypanelTIF-2000 Intelligent Telco Interface MKP4-K Modular Keypanel IFB828 IFB Power Supply PS15 Power SupplySSA324 System-to-System Adapter SAP612 Source Assign Panel Large Studio or Mobile Vehicle Determining the Makeup of the Intercom Matrix First Step--Determine the SizeUsers IFB Circuits Second Step--Determine the Panels CamerasMiscellaneous Other Considerations in Determining Intercom Needs Maintenance How old is Too Old?Expandability Interoperability Budget Glossary AWG O s s a r y CCU CPS Crosstalk Current Current Sources DSP EFP EIA GND Gpio Green Room Ground Ground Loop Potential Ibew IFB IR Drop Isolation Light Signaling Limiter Line Line Level Matrix Maximum SPL Mho Mic Micro µ Microcontroller NAB Nabet NEC Nema PLL PZM RFI RMS Smpte SPL O s s a r y Symbol for the unit of power, the watt Index IFB ISO STL VHF