Which type of digital network divides a radio frequency into time slots?

• A. FDMA
• B. CDMA
• C. TDMA
• D. OFDM

Answer: (C)

Dividing a radio frequency into time slots so multiple users can share the same channel is Time Division Multiple Access. In this approach, the available spectrum is allocated in repeating frames, with each user assigned a specific time slot within the frame. Only during their slot can a user transmit, which prevents collisions and lets many users use the same frequency efficiently. This differs from Frequency Division Multiple Access, where each user gets a distinct frequency band; Code Division Multiple Access, which lets all users transmit over the same frequency band but separates them with unique codes; and Orthogonal Frequency Division Multiplexing, which splits the channel into many subcarriers rather than assigning time slots. Time-based sharing is a hallmark of TDMA systems like certain mobile networks.