Algemene Theorie en Vaardigheden 2. April 2014 Theaterschool OTT-2
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1 Les 4 Showcontrol 1
2 Les 14 System Design Principles 1. Ensure Safety 2. The show must go on 3. Simpler is always better 4. Strive for elegance 5. Complexity is inevitable; convolution is not 6. Leave room for unanticipated changes 7. Ensure security * Convoluted systems = nodeloos ingewikkeld systemen 2
3 Les 4 System Design Principles 1. Ensure Safety Fail-Safe design Single Failure-Proof Safety Emergency Stop Systems // Controlled Stop Humans in the Loop (yes/no?) Effect Enabling Concepts Operator issues (boredom, repetitive actions) FMEA Peer review Mini FMEA oefening 3
4 Les 4 System Design Principles 2. The show must go on Redunancy Ensure maximum computer reliability Disconnect show network from internet Install only what you need, remove what you don t need Manage automatic virus checking Store show files locally BACK UP 4
5 Les 4 System Design Principles 7. Ensure security Keep show network off the internet Use security features on wireless networks Shut down wireless networks when not needed Use passwords on critical machines Control physical acces to critical infrastructure Run only things needed for the show on any machine 5
6 Les 4 System Design Principles Troubleshooting Don t panic Before starting: Signal flow diagram andunderstand it The system is capable of working Conceptual break down of the system Known test signal sources Know how to use test systems, software and equipment Oscilloscopes Ethernet testers DMX testers 6
7 Les 4 System Design Principles Troubleshooting Process 1. Verify the tester / test equipment! 2. Quantify the problem 3. Check the obvious 4. Determine verified, unverfied and suspect devices 5. Go through the system until every device is verified Substitute good parts for suspect parts Work systematically and by yourself (no distraction and confusion added by others) 6. If stuck, clear head; take a break 7. Consult others 7
8 Layering Een layer is onafhankelijk en het maakt niet uit wat er boven of onder ligt OSI ISO Reference Model for Open Systems Interconnection DoD Department of Defense Four-Layer Model (DARPA) 8
9 Layering Data-unit Laag Naam Functie 7 Toepassingslaag Authenticatie, applicaties voor gebruikers Data 6 Presentatielaag Formatteert en structureert data zodat het leesbaar is voor ontvanger, encryptie 5 Sessielaag Start, onderhoudt en beëindigt sessies tussen applicaties Segment 4 Transportlaag Segmenteert data, verzorgt betrouwbaarheid door foutdetectie, verzorgt de volgorde, firewall Packet 3 Netwerklaag Routeert datapakketten, selecteert het beste pad, logische adressering Frame 2 Datalinklaag Toegang tot media, foutdetectie, bepaalt hoe data geconverteerd wordt en hoe toegang tot het netwerk gecontroleerd wordt Bit 1 Fysieke laag Binaire transmissie, elektrische, mechanische, en functionele specificaties 9
10 Layering 10
11 Communicate: Character encoding ASCII, Unicode, UCS-UTF-8 Data rate bits per second / Baud rate Bandwith Multiplexing Time division Frequency division Wavelength division 11
12 Communicate (continued): Simplex, Half Duplex, Full Duplex Error detection Parity checking: add 1 bit, make it even (or odd) Checksum: adding a block of data Cyclic Redundancy Check (used in Ethernet) Add check value Based on remainder of a polynomial division On retrieval repeat calculation Corrective actions if check values do not match 12
13 Flow control Hardware Software RS232 XON / XOFF 13
14 Transmission schemes Point to point Multidrop Who speaks when? Voltage loop Current loop 0 5 V (TTL) 4-20 ma 0-12 V (CMOS) (minder last van inteferenties) 14
15 Transmission schemes Single ended / unbalanced Differential / balanced 15
16 Wire and cable Unshielded, untwisted Unshielded, twisted pair (UTP) Shielded, twisted pair COAX 16
17 Cable Categories Cat 1 Audio, DC Luidsprekerdraad, deurbellen Cat 2 <1,5 MHz Analoge telefoon Cat 3 <16 MHz 10BaseT Cat 4 <20 MHz 10BaseT Cat 5; Cat 5e <100 MHz 100BaseTX Cat 6 <250 MHz 10BASE-T, 100BASE-TX (Fast Ethernet), 1000BASE-T/1000BASE-TX (Gigabit Ethernet) Cat 6A <500 MHz 10GBASE-T (10-Gigabit Ethernet) Cat 7 <600 MHz 10 Gigabit Ethernet Cat 7A < 1000 MHz 40 GigabitEthernet over 50 meter, 100 Gigabit Ethernet over 15 meter 17
18 Cable Length 18
19 Transmission/Modulation methods Wired Non-Return-to-Zero Return-to-Zero Manchester Frequency Shift Keying (FSK) 19
20 Transmission/Modulation methods Manchester (Data XOR Clock) 20
21 Transmission/Modulation methods Optical Radio Few other topics: Page NC/NO contacts Open collector, sourcing, sinking Isolation, OPTO couplers Blus diode 21
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