Final answer:
True, a T-1 frame supports 24 DS0 channels and operates at a frame rate of 8000 frames per second to match the standard 8000 Hz voice sampling rate required for proper voice transmission.
Step-by-step explanation:
The statement "a channelized T-1 frame must have a frame rate of 8000 frames per second (fr/sec) to support 24 DS0 channels" is true. T-1 lines use Time Division Multiplexing (TDM) to carry multiple DS0 voice and data signals over a single line. Each T-1 frame is composed of 24 channels, corresponding to the 24 DS0 channels, and one framing bit for synchronization, making a total of 193 bits per frame. To match up with the standard voice sampling rate, which is 8000 samples per second (the Nyquist rate for telephone audio), T-1 frames are transmitted at a rate of 8000 frames per second. Therefore, this allows each DS0 channel to be sampled and transmitted once per frame.