IT 420
Spring 2017
Homework 3 Solutions
1.4 The checksum on 500 bytes of data is 16 bits long. How long is the checksum on 1000
bytes of data?
1 1 0 1 0 0 0 0
1 0 1 1 1 0 1 0
1 1 0 0 0 1 0 1 0
+1
1 0 0 0 1 0 1 1
Checksum = 01110100
1001 101110000
1001
0101
0000
1010
1001
0110
0000
1100
1001
1010
1001
011 CRC = 011
1001 101110011
1001
0101
0000
1010
1001
0110
0000
1101
1001
1001
1001
000 CRC checks correctly
x6 + x5 + x3 + 1
Frequency Modulation
# bits = log2 (256)
# bits = 8
7.1 What characteristic of the carrier wave is changed to represent the data in FSK?
7.2 What converts analog data to an analog signal?
7.3 What kind of keying changes both the amplitude and the phase of a carrier wave to represent data?
7.4 In what kind of multiplexing does each sender use some of the bandwidth of the link for all time?
7.5 What scheme multiplexes digital signals?
For the top first-layer multiplexer:
BW_link = (2 * BW_channel) + (1 * BW_guard_band)
= (2 * 20 MHz) + (1 * 2 MHz)
= 40 MHz + 2 MHz
= 42 MHz
For the bottom first layer multiplexers:
BW_link = (3 * BW_channel) + (2 * BW_guard_band)
= (3 * 20 MHz) + (2 * 2 MHz)
= 60 MHz + 4 MHz
= 64 MHz
For the second-layer multiplexer:
BW_link = 42 MHz + 64 MHz + 2 MHz
= 108 MHz
There are many possible solutions. Sample solution shown below.
10.3 What is goodput?
formula
10.4 Which is correct about Quality of Service (QoS)? (Choose two.)
delay, and/or jitter
Prop Delay = d / s
= 2000 m / 2 x 108 m/sec
= 0.00001 sec = 10 µsec
500 Mbytes * 8 bits = 4000 Mbits
byte
throughput = data size / time
= 4000 Mbits / 2 sec
= 2000 Mbps
Total delay = 8(2µsec +1µsec) + 50µsec
= 74 µsec
hihi
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