What do the Modes in CX300 DMR mean?

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What do the Modes in CX300 DMR mean?
Direct Mode uses a free-running Inbound signal to evaluate mobile and base station performance. Sync Mode synchronizes the timing of the Test Set’s inbound signal with the outbound signal from a repeater. When Sync Mode is selected the TX Slot slide bar menu is enabled which allows the user to select either Slot 1 or Slot 2 for the transmit channel. Note: The CX300 DMR Repeater Option requires option CX-300-DDMRR.