Question: In a PSS (Transparent end-to-end Packet-switched Streaming Service) timeshift operation, how does the server manage the timeshift buffer as new live data is added?
Option 1: The server expands both the upper and lower ranges of the timeshift buffer to accommodate new data.
Option 2: New live data is added at the lower range, and older data is removed from the upper range if the buffer reaches its capacity.
Option 3: The server pauses adding new data temporarily until the client catches up with the current playback position.
Option 4: New live data is added at the upper range, and if the buffer progresses as a sliding window, data is removed and discarded from the lower range.
Explanation: This option correctly describes how the PSS server manages the timeshift buffer. By adding new live data at the upper range and potentially removing older data from the lower range (if the buffer operates as a sliding window), the server efficiently maintains the buffer's size while ensuring availability of recent content for timeshifting, aligning with practical telecom network requirements for streaming services.