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Connection characteristics
Skills: none
IT concepts: wired and wireless connections, connection technologies, connection length and speed, units of measure for amount of data and connection speed
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.
Where does this topic fit?
• Internet concepts– Applications– Technology (communication)– Implications
• Internet skills– Application development– Content creation
Is the connection wired or wireless?
What technology does the connection use?
How long is the connection?
How fast is the connection?
Connection characteristics
Computer 1 Computer 2
Wired connection technologies
Copper, twisted pair (electronic)
Copper, coaxial cable (electronic)
Fiber (optical)
Some units of measure
Time minutes
Distance inches
Weight pounds
Amount of data bits
Can you think of others?
What is a bit?
A bit is a binary digit, it may take on one of two values, 0 or 1:
0
1
All data types – numbers, images, audio, video, images, etc. are encoded as bits!
Larger units of amount of data
Bit a single 0 or 1
Kilobit 1,000 bits
Megabit 1,000,000 bits
Gigabit 1,000,000,000 bits
Terabit 1,000,000,000,000 bits
Petabit 1,000,000,000,000,000 bits
(These are approximate. A kilobit is actually 1,024 bits, a megabit 1,024*1,024 bits, etc., but this is close enough for most discussions).
Connection speed
Computer 1 Computer 2
How fast can it transmit data?
How many bits can be sent from one computer to the next in a given amount of time?
001110101010101010
Units of measure for a rate (velocity)
Time hours
Distance miles
Velocity miles/hour
miles/hour = “miles per hour”the distance traveled in one hourDistance/time
Can you think of others?
Units of measure for a rate (data transmission speed)
Time seconds
Amount of data bits
Transmission rate bits/second
bits/second = “bits per second”the number of bits transmitted in one secondamount of data/time
Can you think of others?
We discussed four characteristics of a communication link. Without looking back, do you recall what they were?
What is a unit of measure for:
Weight
Length
Rate at which you run
Amount of data
Rate of data transmission
What are two other units of measure for each of the above?
The general form of a unit of measure for velocity is distance/time.
What is the general form of a unit of measure for data transmission speed?
How many bits in a megabyte?
How long would it take to transmit a 100 megabit file over a 100 megabit/second communication link?
How long would it take to transmit a 100 megabit file over a 10 megabit/second communication link?
How long would it take to transmit a 100 megabit file over a one gigabit/second communication link?
How long would it take to transmit a 100 megabyte file over a 100 megabit/second communication link?
How long would it take to transmit a 100 megabit file over a 100 megabyte/second communication link?
This is a 2.03 megabyte image
How many megabits is that?
How long would it take to download this image over a 1 megabit per second connection?
How long would it take over a 1 gigabit per second connection?