There are two modes that ePMP PTP can operate in: ePTP and TDD. I've attached a guide that can walk you through the setup. At a high level, the two different modes can be described below. I would recommend our LINKPlanner design tool to help estimate out performance.
TDD (PTP): The AP operates in Point-To-Point mode using TDD scheduling. In this mode Quality of Service configuration (rate-limiting and traffic prioritization) is available, and TDD mode is recommended for CCTV applications so that link symmetry (adjustment of downlink / uplink ratio) can be controlled to meet the deployment’s high uplink bandwidth requirements.
ePTP: In this mode, the PTP device is able to provide significantly lower latency than other modes. Quality of Service (rate-limiting and traffic prioritization) capability and Link Quality/Capacity indicators are not available in this mode.