Systems Architecture Study Set 1

Computing

Quiz 8 :

Data and Network Communication Technology

Quiz 8 :

Data and Network Communication Technology

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__________________transmission sends bits one at a time over a single transmission line or electrical circuit.
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Serial Transmission
Serial transmission sends bits one at a time over a single transmission line or electrical circuit.
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Serial transmission implements a single transmission line. The data bits are transmitted sequentially through the line and the recipient re-assembles these bits to larger units, such as bytes. LAN is an example of serial transmission.

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Calculate the effective data transfer rate for a dedicated channel, given these characteristics: Data is transmitted in blocks of 48 bytes at 100 Mbps, an 8-bit BCC is used for error detection, and an error is detected, on average, once every 1000 transmitted blocks.
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Effective Data Transfer Rate Calculation
The block check character (BCC) adds one byte of data to each 48 bytes of raw data to be transmitted as a block. The details provided in the problem are given below:
img Therefore,
img The problem also states that
img Therefore, for 1000 blocks
img Since the problem states an average error rate of 1 per thousand, the number of transmissions becomes 1001. Therefore,
img Therefore, the efficiency of the transmission is given as
img The raw data rate is given as 10 Mbps. So the effective data transfer rate of the given problem is calculated below:
img Therefore, the effective data transfer rate of the given transmission is
img .

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For data transmitted over twisted-pair cable, you have these characteristics: A signal s power on the channel is 75 dB, signal attenuation is 5 dB per 100 meters, and average noise power on the cable is 0.1 dB per meter. Answer the following questions: • What 's the S/N ratio at the end of a 50-meter channel? • What 's the S/N ratio at the end of a 1-kilometer channel? • What 's the maximum channel length if the receiving device requires at least 20 dB of S/N ratio for reliable operation?
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Signal-to-Noise Ratio Calculation
The Signal-to-Noise ratio (S/N ratio) is the relationship between a signal's power and the noise power. The relationship is given as
img Here, signal power is given as
img And the noise power is given as
img Therefore, the signal power can be calculated as
img For a 50 meter long channel,
img img The S/N ratio of the channel is calculated as given below:
img Therefore, the Signal-to-Noise ratio for a 50 meter channel is
img .
For a 1 kilometer (1000 meters) long channel,
img img 0
The S/N ratio of the channel is calculated as given below:
img 1
Therefore, the Signal-to-Noise ratio for a 1 kilometer channel is
img 2
.
What is the maximum channel length if the receiving device requires at least 20 dB of S/N ratio for reliable operation
Let the length of the channel be a variable X.
For a x meter long channel,
img 3
img 4
The S/N ratio of the channel is calculated as given below:
img 5
Now, the minimum S/N ratio for the receiver is given as 20 dB. Therefore, to calculate the distance X, we evaluate the above relation with the given S/N ratio. This is given as,
img 6
Now evaluating X as,
img 7
Therefore,
img 8
Therefore, the maximum channel length for reliable operation is
img 9
.

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During half-duplex transmission, sender and receiver switch roles after A(n)____________________ message is transmitted.
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Describe frequency modulation, amplitude modulation, phase-shift modulation, and on-off keying.
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Research InfiniBand Architecture (www.infinibandta.org) to investigate some issues not addressed in the chapter. What signal encoding, cables, and connectors are used? Is the channel serial or parallel? Is transmission synchronous or asynchronous? How are errors detected and corrected?
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Serial transmission standards, including__________________ and__________________ , are replacing parallel transmission standards for connecting secondary storage devices and controllers.
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How does multilevel coding increase a channel s effective data transfer rate?
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The __________________of a sine wave is measured in hertz.
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____________________ converts a digital signal to an analog signal so that digital data can be transmitted over analog phone lines.
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Most local phone service uses __________________switching to route messages from a wired home phone to the local phone-switching center.
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What are the components of a communication channel?
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What are the components of a communication protocol?
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Investigate the IEEE FireWire data communication standard. How is data encoded, and what is the raw transmission speed? Describe how the standard enables quality of service guarantees when transmitting multimedia and other time-sensitive data.
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Investigate the IEEE 806.16 (WiMAX) wireless networking standard. How do transmission speeds and distances compare with the IEEE 802.11 standards? What methods are used to detect and correct transmission errors? Will 802.16 networks eventually replace 802.11 networks? Why or why not?
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How can noise and distortion be introduced into a transmission medium? How does a channel s S/N ratio affect the reliability of data transmission?
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Describe the relationship between bandwidth, data transfer rate, and signal frequency.
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Parity checking is often used in computer memory to detect errors. Investigate current memory types, including parity and error-correcting code (ECC) memory. How is parity checking implemented in the memory module? How are errors detected, and what happens when an error is detected? What types of computer systems should use parity or ECC memory, and why?
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__________________encodes data by varying the distance between wave peaks in an analog signal.
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Compare twisted-pair, coaxial, twin-axial, multimode fiber-optic, and single-mode fiber-optic cable in terms of construction, susceptibility to EMI, cost, and bandwidth or transmission speed.
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