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# Lernmaterialien für IUK an der Frankfurt School of Finance & Management

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Character transmission method

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serial: transmission one after the other on one channel

parallel: simultaneous transmission on several channels

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Signal Transmission Method

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analogue: Transmission of electrical currents

digital: Transmission of electrical impulses (coding)

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ISDN Data Transmission

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Features:
Two user channels (64 Kbit's each)

singling channel between ISDN devices (16 kbit's)

transmission of data can also take place via both user channels
(telephone & data transmission can take place in parallel)

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Manchester Coding

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coding of bits during data transmission

two voltage levels "1" & "0"

Bit Cell (equidistant)

time reserved for bit transmission, level jump occurs during each bit transmission

0: from 1 to 0

1: from 0 to 1

if two identical bits follow one another, jump after first must be set back to previous starting level

clock signal   XOR   nrz encoded data -> Manchester encoded signal

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synchronization

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asynchron: synchronisation for one character (start/stop bit)

synchron: synchronous operation for full string

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actual signal is modulated/demodulated on a high frequency electromagnetic wave

several transmission channels can be calculated via frequency ranges (FDM)

used for example in satellite broadbands

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physical connections

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Cable: copper, fiber

Wireless: satellites, terrestrial

Optical: infrared, laser

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Analogue Data Transmission

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Data is modulated on the audio signals and transmitted over the analogue telephone line

de/modulation via modem (hardware)

number of level changes (baud: 1 bit = 1,5 level change) determines upper limit of transmission speed

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DSL Data Transmission

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physical: use of free bandwidths on the telephone network

ADSL: Asymmetric DSL Copper (1,1 MHZ)

VDSL: Very High Rate DSL (Fiber)

Separate frequency levels for telephone & data transmission(upstream/downstream)

Lösung ausblenden
TESTE DEIN WISSEN

Manchester Coding

Lösung anzeigen
TESTE DEIN WISSEN

coding of bits during data transmission

two voltage levels "1" & "0"

Bit Cell (equidistant)

time reserved for bit transmission, level jump occurs during each bit transmission

0: from 1 to 0

1: from 0 to 1

if two identical bits follow one another, jump after first must be set back to previous starting level

clock signal   XOR   nrz encoded data -> Manchester encoded signal

Lösung ausblenden
TESTE DEIN WISSEN

Multiplexing

Lösung anzeigen
TESTE DEIN WISSEN

combine several channels of information with low transmission speed into one channel with higher transmission speed

space multiplex: spatial separation of channels

frequency multiplex: frequency-based interleaving

time multiplex: division into different time levels

wavelength devision multiplex: different wavelengths for glasfibers

code devision multiplex

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TESTE DEIN WISSEN

operating procedures

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simplex: one-way transmission

half duplex: alternate transmission in both directions

full duplex: transmission in both directions at the same time

Lösung ausblenden
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## Beispielhafte Karteikarten für deinen IUK Kurs an der Frankfurt School of Finance & Management - von Kommilitonen auf StudySmarter erstellt!

Q:

Character transmission method

A:

serial: transmission one after the other on one channel

parallel: simultaneous transmission on several channels

Q:

Signal Transmission Method

A:

analogue: Transmission of electrical currents

digital: Transmission of electrical impulses (coding)

Q:

ISDN Data Transmission

A:

Features:
Two user channels (64 Kbit's each)

singling channel between ISDN devices (16 kbit's)

transmission of data can also take place via both user channels
(telephone & data transmission can take place in parallel)

Q:

Manchester Coding

A:

coding of bits during data transmission

two voltage levels "1" & "0"

Bit Cell (equidistant)

time reserved for bit transmission, level jump occurs during each bit transmission

0: from 1 to 0

1: from 0 to 1

if two identical bits follow one another, jump after first must be set back to previous starting level

clock signal   XOR   nrz encoded data -> Manchester encoded signal

Q:

synchronization

A:

asynchron: synchronisation for one character (start/stop bit)

synchron: synchronous operation for full string

Q:

A:

actual signal is modulated/demodulated on a high frequency electromagnetic wave

several transmission channels can be calculated via frequency ranges (FDM)

used for example in satellite broadbands

Q:

physical connections

A:

Cable: copper, fiber

Wireless: satellites, terrestrial

Optical: infrared, laser

Q:

Analogue Data Transmission

A:

Data is modulated on the audio signals and transmitted over the analogue telephone line

de/modulation via modem (hardware)

number of level changes (baud: 1 bit = 1,5 level change) determines upper limit of transmission speed

Q:

DSL Data Transmission

A:

physical: use of free bandwidths on the telephone network

ADSL: Asymmetric DSL Copper (1,1 MHZ)

VDSL: Very High Rate DSL (Fiber)

Separate frequency levels for telephone & data transmission(upstream/downstream)

Q:

Manchester Coding

A:

coding of bits during data transmission

two voltage levels "1" & "0"

Bit Cell (equidistant)

time reserved for bit transmission, level jump occurs during each bit transmission

0: from 1 to 0

1: from 0 to 1

if two identical bits follow one another, jump after first must be set back to previous starting level

clock signal   XOR   nrz encoded data -> Manchester encoded signal

Q:

Multiplexing

A:

combine several channels of information with low transmission speed into one channel with higher transmission speed

space multiplex: spatial separation of channels

frequency multiplex: frequency-based interleaving

time multiplex: division into different time levels

wavelength devision multiplex: different wavelengths for glasfibers

code devision multiplex

Q:

operating procedures

A:

simplex: one-way transmission

half duplex: alternate transmission in both directions

full duplex: transmission in both directions at the same time

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## Das sind die beliebtesten IUK Kurse im gesamten StudySmarter Universum

LMU München

##### IR

Leiden University

##### IM

IU Internationale Hochschule