1security technology 2007-2007-pict les 1 datacommunicatie systeem 1systeem 2 datacommunicatie...
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1Security Technology 2007-2007-PICT les 1
Datacommunicatie
Systeem 1 Systeem 2
datacommunicatie kanaal
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2Security Technology 2007-2007-PICT les 1
Data communicatie
A B
A B
A B
Simplex
Half-duplex
Full-duplex
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3Security Technology 2007-2007-PICT les 1
serieel, parallel
Bits per seconde (bps) < - > Bytes per (Bps)seconde
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4Security Technology 2007-2007-PICT les 1
Baud
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
In dat geval: bit rate = 2 x baud rate
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5Security Technology 2007-2007-PICT les 1
Multiplexen
Multiplexer Demultiplexer
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6Security Technology 2007-2007-PICT les 1
TDM versus FDM
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7Security Technology 2007-2007-PICT les 1
Parallel (Strobed)
data
ready
ready
data
een strobe is een opgaande of neergaande flank
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8Security Technology 2007-2007-PICT les 1
Parallel (Handshaked)
data
Req
Ack
Req
Ack
data
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9Security Technology 2007-2007-PICT les 1
Serieel (bit Synchroon)
Shift register
Data buffer
Serial data
Parallel data
Shift (transmit) clockTc
receiver
PLL
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10Security Technology 2007-2007-PICT les 1
Clock extraction options
• rely on (very) accurate clocks
• bit stuffing
• Manchester encoding
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11Security Technology 2007-2007-PICT les 1
Serieel (frame synchroon)(tijdelijk synchroon)
idle
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12Security Technology 2007-2007-PICT les 1
Serieel (asynchroon)
Shift register
Data buffer
Serial data
Parallel dataStart bit
data bit
data bit
Par bit
Stop bit
trigger samples
(~ byte synchroon)
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13Security Technology 2007-2007-PICT les 1
Modulatie: AM, FM, PM
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14Security Technology 2007-2007-PICT les 1
Modem (modulator/demodulator)
DTE DTEDCE DCE
Data Terminal
Equipment
Data Communication
Equipment
V24 of RS 232
V21 … V34
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15Security Technology 2007-2007-PICT les 1
Nullmodem
DTE DTE
Data Terminal
Equipment
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16Security Technology 2007-2007-PICT les 1
RS-232 signal
Single-ended
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17Security Technology 2007-2007-PICT les 1
RS-422
Differentiële verbinding
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18Security Technology 2007-2007-PICT les 1
RS-485
Bussysteem (TRI-state)
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19Security Technology 2007-2007-PICT les 1
Master slave
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20Security Technology 2007-2007-PICT les 1
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21Security Technology 2007-2007-PICT les 1
Integrated Services Digital Network (ISDN)
There are two types of ISDN:
Basic Rate Interface (BRI) -- consists of two 64-Kbps B-channels and one D-channel for transmitting control information.
Primary Rate Interface (PRI) -- consists of 23 B-channels and one D-channel (U.S.) or 30 B-channels and one D-channel (Europe).
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22Security Technology 2007-2007-PICT les 1
ISDN NT1/2
B-kanaal 64 kb
D-kanaal 16 kb2B+1D+48 kb (interne signalering) = 192 kb
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23Security Technology 2007-2007-PICT les 1
(Asymmetric) Digital Subscriber Link
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24Security Technology 2007-2007-PICT les 1
Opdracht
bestudeer hoofdstuk 10