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  Applets
  by Jörg Roth

     
   

 Computer communication 

 The mobile Internet 

 Foundations of CS 


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Computer communication

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.
If no applet appears, you have to install the JRE of http://java.sun.com.
(Software license)

The mobile Internet

The mobile Internet applets are only available in German 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)
CDMA

CDMA

This applet illustrates code multiplexing.

Start   (4 participants, 4 Bit spread code)
Start   (2 participants, 8 Bit spread code)
Hilfe


IrDA

IrDA

This applet simulates IrDA connections.

Start
Hilfe


Scatternet

Scatternet

This applet simulates a Bluetooth scatternet.

Start
Hilfe


DSDV

DSDV

This applet simulates DSDV routing.

Start
Hilfe


DSR

DSR

This applet simulates DSR routing.

Start
Hilfe


OLSR

OLSR

This applet simulates OLSR routing.

Start
Hilfe


Link Reversal

Link Reversal

This applet simulates Link Reversal routing.

Start
Hilfe


Foundations of computer science

You can change the input values 0 and 1.
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

Inverter

If no applet appears, you have to install the JRE of http://java.sun.com.

AND gate

If no applet appears, you have to install the JRE of http://java.sun.com.

OR gate

If no applet appears, you have to install the JRE of http://java.sun.com.

XOR gate

If no applet appears, you have to install the JRE of http://java.sun.com.
(Software license)

More gates

NAND gate with
four inputs

If no applet appears, you have to install the JRE of http://java.sun.com.

NOR gate

If no applet appears, you have to install the JRE of http://java.sun.com.

NOR gate with
inverted inputs
(i.e. an AND gate)

If no applet appears, you have to install the JRE of http://java.sun.com.

XNOR gate

If no applet appears, you have to install the JRE of http://java.sun.com.
(Software license)

Feedback circuits

Flicker circuit

If no applet appears, you have to install the JRE of http://java.sun.com.
(Software license)

Flipflops

Flipflop with NAND gates

If no applet appears, you have to install the JRE of http://java.sun.com.

Flipflop with NOR gates

If no applet appears, you have to install the JRE of http://java.sun.com.

D-Flipflop
(discrete)

If no applet appears, you have to install the JRE of http://java.sun.com.

RS-Flipflop
(discrete)

If no applet appears, you have to install the JRE of http://java.sun.com.

RS-Flipflop
(discrete, only NAND gates)

If no applet appears, you have to install the JRE of http://java.sun.com.

D-Flipflop

If no applet appears, you have to install the JRE of http://java.sun.com.

RS-Flipflop

If no applet appears, you have to install the JRE of http://java.sun.com.

Master-Slave-Flipflop

If no applet appears, you have to install the JRE of http://java.sun.com.

JK-Master-Slave-Flipflop
(using RS-Flipflops)

If no applet appears, you have to install the JRE of http://java.sun.com.

JK-Master-Slave-Flipflop

If no applet appears, you have to install the JRE of http://java.sun.com.

T-Flipflop

If no applet appears, you have to install the JRE of http://java.sun.com.
(Software license)

Adder and incrementer

Counter

If no applet appears, you have to install the JRE of http://java.sun.com.

Half adder

If no applet appears, you have to install the JRE of http://java.sun.com.

Full adder

If no applet appears, you have to install the JRE of http://java.sun.com.
(Software license)

Multiplexer/Demultiplexer/Decoder

4 to 1 Multiplexer
(discrete)

If no applet appears, you have to install the JRE of http://java.sun.com.

2 to 4 Decoder
(discrete)

If no applet appears, you have to install the JRE of http://java.sun.com.

1 to 4 Demultiplexer
(discrete)

If no applet appears, you have to install the JRE of http://java.sun.com.

8 to 1 Multiplexer

If no applet appears, you have to install the JRE of http://java.sun.com.

3 to 8 Decoder

If no applet appears, you have to install the JRE of http://java.sun.com.

1 to 8 Demultiplexer

If no applet appears, you have to install the JRE of http://java.sun.com.
(Software license)