Telecommunications Wireless Communications 2

Question 1

What cellular generation introduced the concept of mobile data in the US?

Accepted Answer

2G

Answer

2G (GSM/CDMA) introduced digital voice and basic data services like SMS and limited internet access.

Question 2

What frequency range does 5G mmWave technology primarily use in the US?

Accepted Answer

24 GHz – 40 GHz

Answer

5G mmWave (millimeter wave) uses frequencies between 24 GHz and 40 GHz, enabling extremely high speeds but limited range.

Question 3

What is a femtocell used for in wireless networks?

Accepted Answer

Extend cellular coverage inside buildings

Answer

A femtocell is a small, low-power cellular base station used to extend indoor coverage using the internet as backhaul.

Question 4

What does LTE stand for?

Accepted Answer

Long Term Evolution

Answer

LTE (Long Term Evolution) is the 4G standard for mobile broadband, offering download speeds up to 150 Mbps.

Question 5

Which modulation scheme encodes data by varying signal phase?

Accepted Answer

PSK

Answer

PSK (Phase-Shift Keying) encodes data by shifting the phase of a carrier signal to represent different bit patterns.

Telecommunications Practice Test