In a Point-to-Multipoint (PtMP) system, a central access point (AP) must serve multiple subscriber units or clients over a shared wireless medium. This creates a contention domain where the AP must actively manage and schedule when each client can transmit to avoid collisions and ensure equitable access to the network. This process is known as airtime management. In a Point-to-Point (PtP) system, the link is dedicated between only two devices, so the complex challenge of managing shared medium access among multiple competing clients is not present.

A. Interference avoidance: This is a critical consideration for all wireless systems, including both PtP and PtMP, to maintain link quality and reliability.

B. SINR optimization: Optimizing the Signal-to-Interference-plus-Noise Ratio is a fundamental goal for achieving performance in any wireless link, not just PtMP.

D. Frequency selection: Proper channel and frequency planning is a mandatory step for deploying any wireless link, PtP or PtMP, to prevent interference.

1. CWNP, "CWISA-103 Certified Wireless IoT Solutions Administrator Official Study Guide," (2022). Chapter 2, "RF and Antennas," and Chapter 3, "WLAN and WPAN Standards," discuss different network topologies. The guide explains that in topologies with a shared medium, such as PtMP, the Medium Access Control (MAC) sublayer is responsible for coordinating access. This coordination is the essence of airtime management, a complexity not required in a dedicated PtP link.

2. Kurose, J. F., & Ross, K. W. (2021). "Computer Networking: A Top-Down Approach (8th ed.)." Pearson. Chapter 6, "The Link Layer and LANs," Section 6.3, "Multiple Access Links and Protocols." This section details protocols like TDMA and CSMA/CA, which are designed to manage how multiple nodes share a single broadcast channel. This management of shared access is inherent to PtMP systems but not to dedicated PtP links.

3. Cambium Networks, "PMP 450: Point-to-Multipoint Wireless Broadband Access," (2020). Vendor documentation for PtMP systems frequently emphasizes the proprietary scheduling and airtime management mechanisms (e.g., TDMA-based schedulers) as key features. The PMP 450 technical specifications highlight its sophisticated scheduler for managing traffic from up to 238 subscriber modules, a consideration absent in their PtP product lines like the PTP 670.