Point-to-Multipoint (PTMP) Network Setup
Overall, PTMP networks are ideal for delivering effective and scalable connectivity in various outdoor environments.
When we talk about a Point-to-Multipoint (PTMP) network(s) setup, the Access Point (AP) acts as the central hub, connecting to multiple Subscriber Modules (SMs). The AP typically covers a specific sector using a directional antenna, while the SMs can be equipped with either omni-directional or directional antennas, depending on their location. This structure, known as PTMP, allows one AP to serve multiple fixed endpoints simultaneously, unlike a Point-to-Point (PTP) setup, where only one connection exists between two locations.
However, PTMP is not designed for direct connections with mobile devices like laptops, smartphones, or tablets. These devices typically function in Wi-Fi networks as clients, while in a PTMP setup, SMs are required to establish the connection to the AP. SMs act as the bridge, distributing connectivity to end users. This makes PTMP a more effective solution for delivering high quality speed links to fixed locations over larger distances, especially in scenarios like rural deployments or large industrial sites.
Key to PTMP’s efficiency is the use of Time Division Duplexing (TDD). This method uses a single channel, alternating between transmitting and receiving data, rather than dedicating separate channels for each. In PTMP, the AP coordinates the timing for sending and receiving with all connected SMs, preventing interference and optimizing communication. In environments where mesh networks are impractical due to terrain or distance, PTMP with TDD offers a simpler, more reliable alternative that requires less infrastructure.
To ensure smooth operation, GPS synchronization is crucial. Without it, nearby APs can interfere with each other, especially if one transmits while another is trying to receive. GPS sync ensures all APs and SMs operate in unison, transmitting and receiving at the same time. This minimizes self-interference and maximizes network efficiency. Using systems like the Cluster Management Module (CMM) or UGPS for GPS timing ensures precise coordination, leading to more stable and reliable connectivity across larger geographic areas. 450 Platform User Guide
For example the CMM5 (Cluster Management Module) is the latest generation of solutions for the distribution of TDD Sync signals and “Power-over-Ethernet (PoE)” in the field. The CMM5 is a modular design with individual 4-port power injectors and an optional controller used for remote management.
450 Platform User Guide
To create a giant PTMP network and reuse freqnetie that is in sync an SM can simply serve as a relay by wire a Remote AP to the SM.
For example below here Link 2 is not on the same frequency band as Link 4.
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