Cordless Telephony Quiz - Undergraduate Electrical Engineering

1 What is the primary frequency band used for DECT (Digital Enhanced Cordless Telecommunications) in Europe?

A) 902-928 MHz (ISM Band) B) 1880-1900 MHz C) 1920-1930 MHz (UPCS) D) 2400-2483.5 MHz

2 Which modulation technique is primarily used in classic DECT systems for voice transmission?

A) QPSK (Quadrature Phase Shift Keying) B) GFSK (Gaussian Frequency Shift Keying) C) OFDM (Orthogonal Frequency Division Multiplexing) D) 16-QAM (16-state Quadrature Amplitude Modulation)

3 In a DECT system, how many time slots are available per 10ms frame for full-duplex communication?

A) 12 time slots B) 24 time slots (12 for uplink, 12 for downlink) C) 8 time slots D) 32 time slots

4 What is the maximum average transmission power allowed for DECT portable equipment in Europe?

A) 100 mW B) 10 mW C) 250 mW D) 4 mW

5 Which multiple access technique does DECT use to share the radio spectrum among multiple users?

A) CDMA (Code Division Multiple Access) only B) FDMA/TDMA with TDD (Frequency/Time Division Multiple Access with Time Division Duplex) C) OFDMA (Orthogonal Frequency Division Multiple Access) D) SDMA (Space Division Multiple Access) only

6 In the United States, DECT operates in which frequency band and is marketed under what name?

A) 1880-1900 MHz as "DECT 1.9" B) 1920-1930 MHz as "DECT 6.0" C) 2400-2483.5 MHz as "DECT 2.4" D) 5725-5875 MHz as "DECT 5.8"

7 What is the channel spacing between adjacent DECT carriers in the 1880-1900 MHz band?

A) 1.728 MHz B) 100 kHz C) 200 kHz D) 5 MHz

8 Which component in a cordless telephone system is responsible for terminating the radio link and providing access to the fixed telephone network?

A) Portable Part (PP) or Handset B) Fixed Part (FP) or Base Station C) Gateway D) Antenna Array

9 What is the typical maximum outdoor range of a DECT cordless telephone system?

A) 10 meters B) 100 meters C) 1 kilometer D) 50 meters

10 Which voice codec is mandatory for narrowband voice transmission in DECT systems?

A) G.711 PCM (64 kbit/s) B) G.726 ADPCM (32 kbit/s) C) G.729 (8 kbit/s) D) AMR-NB (Adaptive Multi-Rate)

11 In DECT, which mechanism allows the mobile terminal to select the best available channel when interference is detected?

A) Fixed Channel Allocation (FCA) B) Dynamic Channel Selection (DCS) C) Frequency Division Duplexing (FDD) D) Code Division Multiple Access (CDMA)

12 What is the bit rate of the GFSK modulation used in DECT, and how many bits are in a standard 10ms frame?

A) 1152 kbit/s, 11520 bits B) 2048 kbit/s, 20480 bits C) 270 kbit/s, 2700 bits D) 9600 bit/s, 96 bits

📞 Cordless Telephony Quiz

Quiz Completed!