Network Elements: Recap Name the 9 elements of single networks Without looking back through your handout Never talk about an innovation"reducing cost increasing speed, etc without specifying Which element is cheaper or faster For example, multiplexing only reduces the cost of trunk lines other costs are not decreased 16
16 Network Elements: Recap • Name the 9 Elements of Single networks. – Without looking back through your handout Never talk about an innovation “reducing cost,” “increasing speed,” etc. without specifying which element is cheaper or faster. For example, multiplexing only reduces the cost of trunk lines; other costs are not decreased
Part ll: transmission Speed
Part III: Transmission Speed
I Figure 1-6: Transmission Speed Measuring Transmission Speed O///O Measured in bits per second(bps) In metric notation: Increasing factors of 1,000 Not factors of 1,024 Kilobits per second(kbps )-note the lowercase k Megabits per second(Mbps) Gigabits per second(Gbps) Terabits per second(Tbps) 18
18 Figure 1-6: Transmission Speed • Measuring Transmission Speed – Measured in bits per second (bps) – In metric notation: • Increasing factors of 1,000 … – Not factors of 1,024 • Kilobits per second (kbps)-note the lowercase k • Megabits per second (Mbps) • Gigabits per second (Gbps) • Terabits per second (Tbps)
I Figure 1-6: Transmission Speed Measuring Transmission Speed What is 23, 000 bps in metric notation? What is 3. 000.000.000 in metric notation What is 15, 100,000 bps in metric notation? Occasionally measured in bytes per second If so, written as bps Usually seen in file download speeds 19
19 Figure 1-6: Transmission Speed • Measuring Transmission Speed – What is 23,000 bps in metric notation? – What is 3,000,000,000 in metric notation? – What is 15,100,000 bps in metric notation? • Occasionally measured in bytes per second • If so, written as Bps • Usually seen in file download speeds
I Figure 1-6: Transmission Speed Writing Transmission Speeds in Proper Form The rule for writing speeds (and metric numbers in general) in proper form is that there should be 1 to 3 places before the decimal point 23.72 Mbps is correct(2 places before the decimal point) 2, 300 Mbps has four places before the decimal point, so it should be rewritten as 2. 3 Gbps(1 place) 0. 5 Mbps has zero places to the left of the decimal point It should be written as 500 kbps(3 places) 20
20 Figure 1-6: Transmission Speed • Writing Transmission Speeds in Proper Form – The rule for writing speeds (and metric numbers in general) in proper form is that there should be 1 to 3 places before the decimal point – 23.72 Mbps is correct (2 places before the decimal point). – 2,300 Mbps has four places before the decimal point, so it should be rewritten as 2.3 Gbps (1 place). – 0.5 Mbps has zero places to the left of the decimal point. It should be written as 500 kbps (3 places)