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1CSNW1 – week 3 Datacommunicatie. Datacommunicatie? Communications men string telephone wire on an Enewetok tree. National Park Service (USA) Datacommunicatie.

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Presentation on theme: "1CSNW1 – week 3 Datacommunicatie. Datacommunicatie? Communications men string telephone wire on an Enewetok tree. National Park Service (USA) Datacommunicatie."— Presentation transcript:

1 1CSNW1 – week 3 Datacommunicatie

2 Datacommunicatie? Communications men string telephone wire on an Enewetok tree. National Park Service (USA) Datacommunicatie ?

3 PU-1 MEMORY I/O Adresbus databus besturingsbus PU-2 Tightly coupled Multi processor Datacommunicatie (1)

4 Systeem 1Systeem 2 loosely coupled, via (extern) netwerk datacommunicatie kanaal Datacommunicatie (2)

5 AB AB AB Simplex Half-duplex Full-duplex Communicatiekanaal

6 Parallel versus serieel n Bits per second (bps) vs. Bytes per second (Bps) n Baud rate: symbols/sec n bps = baud. 2 log n (n: number of signal levels)

7 The number of signaling elements that occur each second. The term is named after J.M.E. Baudot, the inventor of the Baudot telegraph code. element bijvoorbeeld 4 niveaus twee bits bit rate = 2 x baud rate Baud rate

8 MultiplexerDemultiplexer Multiplexing

9 TDM versus FDM Frequency Division Multiplexing Time Division Multiplexing

10 Shift register Data buffer Serial data Parallel data Shift (transmit) clock Tc Bipolar encoding Manchester encoding Clock extracting receiver PLL Serieel (bit-synchroon)

11 BI-SYNC protocol

12 Serieel (frame synchroon) (tijdelijk synchroon) idle

13 Shift register Data buffer Serial data Parallel data Start bit data bit Par bit Stop bit trigger samples Serieel (asynchroon)

14 data ready data Een strobe is een opgaande of neergaande flank Parallel (strobe)

15 REQ ACK data Parallel (handshake)

16 ready Ack data ready Ack data valid Parallel (handshake) data staat klaar

17 Centronics Interface

18 n V.21: 300 bps duplex n V.22: 1200 bps duplex n V.22bis: 2400 bps duplex n V.24: interchange DTE – DCE (RS232) n V.32: 9600 bps duplex n V32bis: bps duplex n V.34: bps duplex n V.90: bps duplex n X.25: The most popular packet-switching protocol for WANs n X.400: The universal protocol for . C omité C onsultatif I nternational T élégraphique et T éléphonique (CCITT) Nu: I nternational T elecommunication U nion (ITU) V (oiceband) en X - normen

19 V.24 - RS-232 (25-polig) Recommended Standard => EIA-232-D Electronic Industries Alliance

20 9-polige RS-232 connector RI = Ring Indicator

21 DTE Data Terminal Equipment Null Modem

22 Single-ended RS-232 signaal

23 Spraak 4 kHz bandbreedte ( Hz) Openbare ‘analoge’ netwerken

24 Modulatie: AM, FM, PM

25 DTE DCE Data Terminal Equipment Data Communication Equipment V24 of RS 232 V21 … V34 Modem (modulator/demodulator)

26 (Asymmetric) Digital Subscriber Link Computer Modem Splitter

27 DSL Digital Subscriber Link 5460 m

28 ADSL Spectrum Fritz!box Image: Wikipedia

29 CMTS Cable Modem Termination System

30 Opdrachten n Bestudeer hfdst t/m 10.6 n Maak opgaven 10.1 t/m 10.4 en 10.6


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