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Computer communication
The mobile Internet
Foundations of CS
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CRC Applet
The next applet computes the CRC checksum to the generator x3+x2+1.
It operates as follows:
- Clear: clears all D-Flipflops
- I: Input of the information polynom (+000) to compute the remainder or bzw. the code polynom to check the checksum. Most significant bit is processed first.
- T: Clock
After processing, the remainder is stored in (Q1, Q2, Q3), or 000 if checking the code polynom was successful.
If the applet does not appear, you have to install the Java Runtime Environment of http://java.sun.com.
Maybe the security settings of the browser have to be adjusted.
(Software license)
The mobile Internet applets are only available in German  .
If the applets do not appear, you have to install the Java Runtime Environment of http://java.sun.com.
Maybe the security settings of the browser have to be adjusted.
(Software license)
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This applet illustrates code multiplexing.
 (4 participants, 4 Bit spread code)
(2 participants, 8 Bit spread code)
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This applet simulates IrDA connections.
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This applet simulates a Bluetooth scatternet.
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This applet simulates DSDV routing.
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This applet simulates DSR routing.
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This applet simulates OLSR routing.
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This applet simulates Link Reversal routing.
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You can change the input values  and  .
If the applets do not appear, you have to install the Java Runtime Environment of http://java.sun.com.
Maybe the security settings of the browser have to be adjusted.
Basic elements
(Software license)
More gates
NAND gate with
four inputs
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NOR gate
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NOR gate with
inverted inputs
(i.e. an AND gate)
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XNOR gate
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(Software license)
Feedback circuits
(Software license)
Flipflops
Flipflop with NAND gates
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Flipflop with NOR gates
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D-Flipflop
(discrete)
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RS-Flipflop
(discrete)
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RS-Flipflop
(discrete, only NAND gates)
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D-Flipflop
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RS-Flipflop
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Master-Slave-Flipflop
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JK-Master-Slave-Flipflop
(using RS-Flipflops)
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JK-Master-Slave-Flipflop
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T-Flipflop
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(Software license)
Adder and incrementer
(Software license)
Multiplexer/Demultiplexer/Decoder
4 to 1 Multiplexer
(discrete)
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2 to 4 Decoder
(discrete)
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1 to 4 Demultiplexer
(discrete)
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8 to 1 Multiplexer
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3 to 8 Decoder
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1 to 8 Demultiplexer
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(Software license)
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