Below are the answers key for Frenzel Self-test in Chapter 12: Data Communications from the book COMMUNICATIONS ELECTRONICS by Louis E. Frenzel. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.
1. binary or digital
2. true
3. telegraph
4. continuous wave (CW)
5. dots, dashes
6. K = _._; 8= _ _ _.. ; , = _ _.._ _
7. baudot
8. teletype
9. M
10. ASCII
11. EBCDIC
12. B = 1000010; 3 = 0110011; ? = 0111111
13. 0000111
14. serial, parallel
15. false
16. shift register
17. start, stop
18. bits per second (bits/s)
19. baud rate
20. true
21. false
22. blocks
23. space, mark
24. information theory
25. bandwidth, time
26. 10,000
27. 60,000
28. true
29. less
30. 50
31. 100
32. modulator, demodulator
33. analog, digital (or binary)
34. telephone network
35. computers
36. frequency-shift keying
37. frequencies
38. mark (1), space (0)
39. 1070, 1270, 2025, 2225
40. universal asynchronous receiver transmitter (UART)
41. phase-shift keying
42. 0, 180
43. balanced modulator
44. balanced modulator
45. carrier recovery
46. differential
47. XNOR
48. four
49. 2 bits
50. four
51. bit splitter (or shift register)
52. 2-t0-4 level converter
53. amplitude, PSK
54. true
55. false
56. true
57. false
58. true
59. protocols
60. redundancy, special error-checking codes, parity, block check code, cyclical redundancy check
61. handshaking
62. Xmodem
63. block
64. asynchronous
65. SYN or sync
66. header
67. STX, ETX or ETB
68. redundancy
69. ARQ exact-count
70. noise
71. bit error rate
72. parity
73. block check character
74.
- a. 1
- b. 0
- c. 1
- d. 1
75. vertical redundancy check
76. exclusive OR
77. block check character
78. longitudinal redundancy check
79. cyclical redundancy check
80. shift register
81. true
82. wide area network
83. true
84. local area networks
85. private branch exchange
86. false
87. star, ring, bus
88. star
89. star
90. mainframe (or mini)
91. ring
92. nodes
93. bus
94. bus
95. ring
96. gateway
97. bridge
98. twisted pair, coax, fiber-optic cable
99. tree
100. noise susceptibility, short distances, low data rates
101. coax
102.fiber-optic cable
103. coax
104. 1, 10,50
105. baseband
106. baseband
107. broadband
108. modem
109. modulation, multiplexing
110. frequency hopping, direct sequence
111. frequency synthesizer
112. pseudorandom noise code generator
113. false
114. noise
115. PSN code
116. dwell time
117. X-OR
118. true
119. PSK
120. synchronism
121. correlation
122. security, jam-proof
123. shift register
124. 902- to 928-, 2400- to 2483-, 5725- to 5850-MHz
125. wireless LANs, wireless computer modems
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