1Security Technology 2007-2007-PICT les 1 Datacommunicatie Systeem 1Systeem 2 datacommunicatie...
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Transcript of 1Security Technology 2007-2007-PICT les 1 Datacommunicatie Systeem 1Systeem 2 datacommunicatie...
1Security Technology 2007-2007-PICT les 1
Datacommunicatie
Systeem 1 Systeem 2
datacommunicatie kanaal
2Security Technology 2007-2007-PICT les 1
Data communicatie
A B
A B
A B
Simplex
Half-duplex
Full-duplex
3Security Technology 2007-2007-PICT les 1
serieel, parallel
Bits per seconde (bps) < - > Bytes per (Bps)seconde
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
5Security Technology 2007-2007-PICT les 1
Multiplexen
Multiplexer Demultiplexer
6Security Technology 2007-2007-PICT les 1
TDM versus FDM
7Security Technology 2007-2007-PICT les 1
Parallel (Strobed)
data
ready
ready
data
een strobe is een opgaande of neergaande flank
8Security Technology 2007-2007-PICT les 1
Parallel (Handshaked)
data
Req
Ack
Req
Ack
data
9Security Technology 2007-2007-PICT les 1
Serieel (bit Synchroon)
Shift register
Data buffer
Serial data
Parallel data
Shift (transmit) clockTc
receiver
PLL
10Security Technology 2007-2007-PICT les 1
Clock extraction options
• rely on (very) accurate clocks
• bit stuffing
• Manchester encoding
11Security Technology 2007-2007-PICT les 1
Serieel (frame synchroon)(tijdelijk synchroon)
idle
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)
13Security Technology 2007-2007-PICT les 1
Modulatie: AM, FM, PM
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
15Security Technology 2007-2007-PICT les 1
Nullmodem
DTE DTE
Data Terminal
Equipment
16Security Technology 2007-2007-PICT les 1
RS-232 signal
Single-ended
17Security Technology 2007-2007-PICT les 1
RS-422
Differentiële verbinding
18Security Technology 2007-2007-PICT les 1
RS-485
Bussysteem (TRI-state)
19Security Technology 2007-2007-PICT les 1
Master slave
20Security Technology 2007-2007-PICT les 1
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).
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
23Security Technology 2007-2007-PICT les 1
(Asymmetric) Digital Subscriber Link
24Security Technology 2007-2007-PICT les 1
Opdracht
bestudeer hoofdstuk 10