CS101 - Introduction to Computing Assignment # 01

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GMT + 8 Hours CS101 - Introduction to Computing Assignment # 01

Post by Asad on Fri Apr 15, 2011 3:52 pm

Question No.1 (Marks = 10)

Compare Serial and Parallel Ports. Give any five points in tabular form.

Serial Port --------- Parallel Port


Question No.2 (Marks = 5)
Write any two situations where audio input is more beneficial than other type (text, image etc) of input approaches?

Solution idea for q 1
• However, since the beginning of the 21st century, the parallel port has largely been replaced by the USB port, although some ancillary devices still allow for connection by both means. One key differencebetween a serial and parallel port is that the serial port allows for data to be transferred in from a remote device or transferred out from the hard drive to a remote device.
• Developers manufactured adapters to run SCSI devices by parallel ports. Through the evolution of parallel communication, the Universal Serial Bus (USB) and ethernet interfaces were developed, and they have effectively replaced the parallel port.
In computing, a serial port is a serial communication physical interface through which information transfers in or out one bit at a time (contrast parallel port).[1] Throughout most of the history of personal computers, data transfer through serial ports connected the computer to devices such as terminals and various peripherals.
While such interfaces as Ethernet, FireWire, and USB all send data as a serial stream, the term "serial port" usually identifies hardware more or less compliant to the RS-232 standard, intended to interface with a modem or with a similar communication device.
Modern computers without serial ports may require serial-to-USB converters to allow compatibility with RS 232 serial devices. Serial ports are still used in applications such as industrial automation systems, scientific instruments, shop till systems and some industrial and consumer products. Server computers may use a serial port as a control console for diagnostics. Network equipment (such as routers and switches) often use serial console for configuration. Serial ports are still used in these areas as they are simple, cheap and their console functions are highly standardized and widespread. A serial port requires very little supporting software from the host system.


A parallel port is a type of interface found on computers (personal and otherwise) for connecting various peripherals. In computing, a parallel port is a parallel communication physical interface. It is also known as a printer port or Centronics port. The IEEE 1284 standard defines the bi-directional version of the port, which allows the transmission and reception of data bits at the same time.
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GMT + 8 Hours Re: CS101 - Introduction to Computing Assignment # 01

Post by Asad on Fri Apr 15, 2011 3:55 pm

QUESTION NO 1… PICK IDEA FROM HERE AND SOLVE YOUR ASSIGNMENT
Serial and parallel ports are two different types of connecting devices. They can be used to connect all sorts of peripherals like modems, mice, and printers. In this section, we will discuss the differences between serial and parallel ports.
Serial Ports:
Serial ports work by breaking up bytes into separate bits. It can only do this by using a special controller chip called the Universal Asynchronous Receiver/Transmitter (UART). If your computer has both parallel and serial ports, then the UART takes the bytes from the parallel ports and breaks them up into individual bits so they can go through a serial port. Most serial ports can transfer data at 115 kilobits per second. However, there are some super fast serial ports, like the Enhanced Serial Port (ESP) and the Super Enhanced Serial Port (Super ESP).
Parallel Ports:
If you have a printer connected to your computer, then you most likely have parallel ports in your computer system. This is because almost all printers are connected to a computer system via parallel ports. As stated above, parallel ports can transfer eight bits of data at a time. The bits are transferred side by side, in parallel fashion. Parallel ports can usually transfer data at about 50 to 100 kilobytes per second.
As you can see, this is much faster than the serial port's 115 kilobits per second.

There are three newer types of parallel ports:

1. 1. Standard Parallel Port
2. 2. Enhanced Parallel Port
3. 3. Extended Capabilities Port
Question 2..Answer
1- Any Picture and Text password is secure identity for security. But we all know that there are no same voices of people in the world. So We can use our Audio Input for a high Security.
2- We can Find and write the words through Giving audio Input (Speaking) to Computer. It is very easy for us and we can do our work without typing.
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GMT + 8 Hours Re: CS101 - Introduction to Computing Assignment # 01

Post by Abir on Fri Apr 15, 2011 3:58 pm

Parallel DataThe parallel port on modern computer systems is an example of a parallel communications connection. The parallel port has 8 data wires, and a large series of ground wires and control wires. IDE harddisk connectors are another good example of parallel connections in a computer system.[You must be registered and logged in to see this image.]




Serial DataThe serial port on modern computers is a good example of serial communications. Serial ports have either a single data wire, or a single differential pair, and the remainder of the wires are either ground or control signals. USB and FireWire are good examples of other serial communications standards.

Which is Better?It is a natural question to ask which one of the two transmission methods is better. At first glance, it would seem that parallel ports should be able to send data much faster than serial ports. Let's say we have a parallel connection with 8 data wires, and a serial connection with a single data wire. Simple arithmetic seems to show that the parallel system can transmit 8 times as fast as the serial system.

However, parallel ports suffer extremely from inter-symbol interference (ISI) and noise, and therefore the data can be corrupted over long distances. Also, because the wires in a parallel system have small amounts of capacitance and mutual inductance, the bandwidth of parallel wires is much lower than the bandwidth of serial wires. We all know by now that an increased bandwidth leads to a better bit rate. We also know that less noise in the channel means we can successfully transmit data reliably with a lower Signal-to-Noise Ratio, SNR.

If, however, we bump up the power in a serial connection by using a differential signal with 2 wires (one with a positive voltage, and one with a negative voltage), we can use the same amount of power, have twice the SNR, and reach an even higher bitrate without suffering the effects of noise. USB cables, for instance, use shielded, differential serial communications, and the USB 2.0 standard is capable of data transmission rates of 480Mbits/sec!

In addition, because of the increased potential for noise and interference, parallel wires need to be far shorter than serial wires. Consider the standard parallel port wire to connect the PC to a printer: those wires are between 3 and 4 feet long, and the longest commercially available is typically 25 feet. Now consider ethernet wires (which are serial, and typically unshielded twisted pair): they can be bought in lengths of 100 feet, and a 300 foot run is not uncommon!

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GMT + 8 Hours Re: CS101 - Introduction to Computing Assignment # 01

Post by Asad on Fri Apr 15, 2011 4:01 pm

Question No.1 (Marks = 10)

Compare Serial and Parallel Ports. Give any five points in tabular form.

Serial Port
Parallel Port
Transmits 1 Bit of Data at a time Transmit Multiple Bits of Data
Works Relatively Slow Works Relatively Fast
Male Port Female Port
Used for Mouse, Modem, Keyboard etc. Used mostly for Printers
Less Numbers of Wires are Used for
Communication Many number of Wires are Used for
Communication


Ans # 2
1- Any Picture and Text password is secure identity for security. But we all know
that there are no same voices of people in the world. So We can use our Audio
Input for a high Security.

2- We can Find and write the words through Giving audio Input (Speaking) to
Computer. It is very easy for us and we can do our work without typing.

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GMT + 8 Hours Re: CS101 - Introduction to Computing Assignment # 01

Post by Abir on Fri Apr 15, 2011 4:03 pm

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