NT1210 Introduction to Networking
Midterm Prep
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1. Kilobyte, Megabyte, Gigabyte, Terabyte
Size (2N
Bytes)
Term
Size (Bytes)
Kilobyte
Megabyte
Gigabyte
Terabyte
1024
1,048,576
1,073,741,824
1,099,511,627,776
Kilobyte, Megabyte, Gigabyte, Terabyte
210
220
230
240
Rounded by
Size (Bytes)
1,000
1,000,000
1,000,000,000
1,000,000,000,000
Table 1-1
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2. Writing Individual Bits in Byte 4 of RAM
RAM circuitry sends a slightly different electrical input to the bits that need to store
a 1 versus a 0 to control the capacitors . Essentially, RAM chooses one of two
inputs to each bit, which results in either a full or partial charge in the capacitor,
which in turn represents either a 1 or 0, respectively.
Writing Individual Bits in Byte 4 of RAM
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Figure 1-4
3. Converting Binary 01111011 to Decimal 123
1. Multiply the decimal digit value times the binary value in
each of the eight columns.
2. Add the eight numbers found from the previous step (bottom
row in the table).
Converting Binary 01111011 to Decimal 123
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Figure 1-7
4. Writing Data to Sectors, Tracks
A platter has many
locations that can hold
magnetic charges.
Physically, these
locations exist in
concentric circles, with
each circle called a
track. A sector refers to
a subset of a track, as
shown in the figure.
Tracks and Sectors in a Single Disk Drive Platter
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Figure 1-15
5. Hex Decimal & Binary
6. Digital Voice Calls, Part 2
Part of A/D process breaks voice into very small time
intervals.
Voice in calls sampled voice 8000 times per second so each
sound sample was .125 milliseconds long
Another part of A/D process assigns binary value to each
unique short sound (similar to character map process).
Original AT&T A/D conversion process used 8-bit code.
To make use of networks for more efficient, lower cost,
and better calls, Telcos added equipment to do A/D
conversion process on each...