IUK at Frankfurt School Of Finance & Management | Flashcards & Summaries

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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Broadband transmission

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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

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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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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

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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

Mehr Karteikarten anzeigen
Q:

Broadband transmission

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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