EEEN 462 - Analog Telephone Access Network Quiz
Test your knowledge of traditional telephone network technologies
1
What is the standard voltage used for ringing signal in analog telephone systems?
48V DC
90V AC
12V DC
5V AC
2
What is the typical DC voltage supplied to an analog telephone when off-hook?
90V
48V
12V
5V
3
What is the purpose of a hybrid coil in a telephone set?
To convert between 2-wire and 4-wire circuits
To step up the voltage for transmission
To filter out high frequencies
To generate the dial tone
4
What frequency range is used for voice transmission in analog telephone systems?
20 Hz to 20 kHz
300 Hz to 3.4 kHz
0 Hz to 4 kHz
1 kHz to 10 kHz
5
What is the typical resistance of the subscriber loop in analog telephone systems?
100 ohms
600 ohms
1 kohm
10 kohms
6
What does DTMF stand for in telephone systems?
Digital Telephone Modulation Frequency
Dual-Tone Multi-Frequency
Direct Telephone Message Format
Dial Tone Modulation Frequency
7
What is the primary function of a SLIC (Subscriber Line Interface Circuit)?
To convert digital signals to analog
To interface between the telephone line and digital switching system
To amplify voice signals
To generate ringing signals
8
What is the typical current drawn by an analog telephone when off-hook?
5-10 mA
20-50 mA
100-150 mA
200-300 mA
9
What is the purpose of a carbon microphone in traditional telephone handsets?
To amplify the voice signal
To convert sound waves to electrical signals
To filter out background noise
To generate the sidetone
10
What is the typical impedance of a standard analog telephone?
300 ohms
600 ohms
900 ohms
1200 ohms
11
What does POTS stand for in telecommunications?
Packet-Oriented Telephone Service
Plain Old Telephone Service
Public Office Telephone System
Primary Optical Telephone Service
12
What is the purpose of a loading coil in telephone lines?
To increase the voltage
To reduce signal distortion over long distances
To amplify the voice signal
To filter out high frequencies
13
What is the typical frequency of the ringing signal in analog telephone systems?
16-25 Hz
50-60 Hz
100-120 Hz
1 kHz
14
What is the primary purpose of the sidetone in a telephone handset?
To let the speaker hear their own voice
To amplify the incoming voice signal
To cancel echo
To generate the dial tone
15
What is the typical loop resistance limit for analog telephone lines?
500 ohms
1000 ohms
1500 ohms
2000 ohms
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Answer Key
Question 1:
b (90V AC)
Question 2:
b (48V)
Question 3:
a (To convert between 2-wire and 4-wire circuits)
Question 4:
b (300 Hz to 3.4 kHz)
Question 5:
b (600 ohms)
Question 6:
b (Dual-Tone Multi-Frequency)
Question 7:
b (To interface between the telephone line and digital switching system)
Question 8:
b (20-50 mA)
Question 9:
b (To convert sound waves to electrical signals)
Question 10:
b (600 ohms)
Question 11:
b (Plain Old Telephone Service)
Question 12:
b (To reduce signal distortion over long distances)
Question 13:
a (16-25 Hz)
Question 14:
a (To let the speaker hear their own voice)
Question 15:
c (1500 ohms)