Scenario: You are a networking and communications consultant working for Houston

Question

Scenario:
You are a networking and communications consultant working for HoustonComm
Services, Inc, further referred to as HCS. HCS is a company providing technology consulting
services to start-ups and established large companies. Recently HCS has been approached by Mr.
Smith, the Chief Operations Officer of Procter & Gamble (PG). PG has many regional divisions
across US, each organized around a central regional headquarter. They are now trying to expand
into the South US area and are working on the logistics for opening a new regional headquarter
just south of Dallas. As part of these efforts, Mr. Smith has recently contacted HCS to provide
them with one consultant to help with few communications-oriented tasks. You are assigned to
this role.
Available information as provided by PG:
The communications architecture for the new regional headquarter has been established already.
The new location south of Dallas will include a 3-story office building and a very large
warehouse in close proximity to the office building.
Task 1:
It has been established that communication between a supervisor’s computer and a computer that
controls equipment within the warehouse will use an encoding of 8 bits per symbol. What is the
baud rate if the bit rate of the communication line is 1,024,000 bps?
Task 2:
It is known that the established architecture includes a direct wired voice communication option
between supervisors and workers (using voice terminals at set locations) in the warehouse. For
that part, the communication has a wavelength of 0.4 meters and a speed of 4x106 meters per
second. What is the frequency of this communication?
Task 3:
For the voice communication in task 2, it has been decided that a 16-QAM (2 phase shifts and 8
amplitude levels) will be used. If the maximum frequency for this voice circuit is the frequency
calculated for Task 2, then what is the data capacity of the analog line, assuming ideal conditions
(no noise)?
Task 4:
Communication among office computers is based on a protocol that uses CRC-32 for error
detection. A series of 100 identical test messages are being exchanged between office computers
in an attempt to test the reliability of communication lines. The decimal value corresponding to
the binary version of each one of these test messages is 22,405. According to the used protocol,
what is the expected EDV (error detection values) that the testing professionals should read for
these messages once they arrive at a destination computer?
Task 5:
The communication protocol used between office computers makes use of the following fields in
each frame that it creates:
- 2 address fields of 8 bytes each
- 4 additional address fields of 8 bytes each
- 8 control flags of 2 bytes each
- 1 sequencing and synchronization field of 4 bytes
- 1 combined preamble field of 32 bytes
- 1 start flag of 1 byte
- A message area of fixed length (1000 bytes)
- A CRC-64 field for error detection
- 1 end flag of 1 byte
What is the transmission efficiency?
We know that throughput is defined as the total number of information bits transmitted (sent) per
second. Let’s assume that 1 in 5 frames transmitted will have errors, and that the communication
infrastructure allows for up to 1000 frames per second to be communicated among computers.
What is the throughput under these conditions?
We define goodput as the total number of useful bits (message) communicated (received) per
second. What is the goodput under the conditions stated above?

Explanation / Answer

Available information as provided by PG:
The communications architecture for the new regional headquarter has been established already.
The new location south of Dallas will include a 3-story office building and a very large
warehouse in close proximity to the office building.
Task 1:
It has been established that communication between a supervisor’s computer and a computer that
controls equipment within the warehouse will use an encoding of 8 bits per symbol. What is the
baud rate if the bit rate of the communication line is 1,024,000 bps?
Task 2:
It is known that the established architecture includes a direct wired voice communication option
between supervisors and workers (using voice terminals at set locations) in the warehouse. For
that part, the communication has a wavelength of 0.4 meters and a speed of 4x106 meters per
second. What is the frequency of this communication?
Task 3:
For the voice communication in task 2, it has been decided that a 16-QAM (2 phase shifts and 8
amplitude levels) will be used. If the maximum frequency for this voice circuit is the frequency
calculated for Task 2, then what is the data capacity of the analog line, assuming ideal conditions
(no noise)?
Task 4:
Communication among office computers is based on a protocol that uses CRC-32 for error
detection. A series of 100 identical test messages are being exchanged between office computers
in an attempt to test the reliability of communication lines. The decimal value corresponding to
the binary version of each one of these test messages is 22,405. According to the used protocol,
what is the expected EDV (error detection values) that the testing professionals should read for
these messages once they arrive at a destination computer?
Task 5:
The communication protocol used between office computers makes use of the following fields in
each frame that it creates:
- 2 address fields of 8 bytes each
- 4 additional address fields of 8 bytes each
- 8 control flags of 2 bytes each
- 1 sequencing and synchronization field of 4 bytes
- 1 combined preamble field of 32 bytes
- 1 start flag of 1 byte
- A message area of fixed length (1000 bytes)
- A CRC-64 field for error detection
- 1 end flag of 1 byte
What is the transmission efficiency?
We know that throughput is defined as the total number of information bits transmitted (sent) per
second. Let’s assume that 1 in 5 frames transmitted will have errors, and that the communication
infrastructure allows for up to 1000 frames per second to be communicated among computers.
What is the throughput under these conditions?
We define goodput as the total number of useful bits (message) communicated (received) per
second. What is the goodput under the conditions stated

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