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1CSNW1 – week 3Datacommunicatie
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Datacommunicatie?
Communications men string telephone wire on an Enewetok tree.
National Park Service(USA)
Datacommunicatie ?
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PU-1 MEMORY I/O
Adresbus
databus
besturingsbus
PU-2
Tightly coupled
Multi processor
Datacommunicatie (1)
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Systeem 1 Systeem 2
loosely coupled, via (extern) netwerk
datacommunicatie kanaal
Datacommunicatie (2)
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A B
A B
A B
Simplex
Half-duplex
Full-duplex
Communicatiekanaal
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Parallel versus serieel
Bits per second (bps) vs. Bytes per second (Bps) Baud rate: symbols/sec bps = baud . 2log n (n: number of signal levels)
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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
00011011
twee bits
bit rate = 2 x baud rate
Baud rate
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Multiplexer Demultiplexer
Multiplexing
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TDM versus FDM
Frequency Division Multiplexing
Time Division Multiplexing
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Shift register
Data buffer
Serial data
Parallel data
Shift (transmit) clockTc
• Bipolar encoding
• Manchester encoding
Clock extractingreceiver
PLL
Serieel (bit-synchroon)
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BI-SYNC protocol
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Serieel (frame synchroon)(tijdelijk synchroon)
idle
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Shift register
Data buffer
Serial data
Parallel dataStart bit
data bit
data bit
Par bit
Stop bit
trigger samples
Serieel (asynchroon)
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data
ready
ready
data
Een strobe is een opgaande of neergaande flank
Parallel (strobe)
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REQ
ACK
data
Parallel (handshake)
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ready
Ack
data data
ready
Ack
data valid
Parallel (handshake)data staat klaar
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Centronics Interface
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V.21: 300 bps duplex V.22: 1200 bps duplex V.22bis: 2400 bps duplex V.24: interchange DTE – DCE
(RS232) V.32: 9600 bps duplex V32bis: 14.400 bps duplex V.34: 28.800 bps duplex V.90: 56.600 bps duplex
X.25: The most popular packet-switching protocol for WANs
X.400: The universal protocol for e-mail.
Comité Consultatif International Télégraphique et Téléphonique (CCITT)
Nu: International Telecommunication Union (ITU)
V(oiceband) en X - normen
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V.24 - RS-232 (25-polig)
Recommended Standard => EIA-232-DElectronic Industries Alliance
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9-polige RS-232 connector
RI = Ring Indicator
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DTE DTE
Data Terminal
Equipment
Null Modem
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Single-ended
RS-232 signaal
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Spraak 4 kHz bandbreedte
(300 - 3400 Hz)
Openbare ‘analoge’ netwerken
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Modulatie: AM, FM, PM
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DTE DTEDCE DCE
Data Terminal
Equipment
Data Communication
Equipment
V24 of RS 232
V21 … V34
Modem (modulator/demodulator)
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(Asymmetric) Digital Subscriber Link
Computer
Modem
Splitter
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DSL
DigitalSubscriberLink
5460 m
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ADSL Spectrum Fritz!box
Image: Wikipedia
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CMTS
CableModemTerminationSystem
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Opdrachten
Bestudeer hfdst. 10.1 t/m 10.6 Maak opgaven 10.1 t/m 10.4 en 10.6