{"id":4388,"date":"2025-11-10T11:12:00","date_gmt":"2025-11-10T11:12:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/glossary\/point-to-multipoint-p2mp-optical-networks\/"},"modified":"2026-06-22T05:17:20","modified_gmt":"2026-06-22T05:17:20","slug":"point-to-multipoint-p2mp-optical-networks","status":"publish","type":"post","link":"https:\/\/resources.l-p.com\/ru\/glossary\/point-to-multipoint-p2mp-optical-networks","title":{"rendered":"Point-to-Multipoint (P2MP) Optical Network Architecture"},"content":{"rendered":"

🌐 Point-to-Multipoint Definition<\/h2>\n\n\n\n
\"What<\/figure>\n\n\n\n

\u25b7 What is P2MP?<\/h3>\n\n\n\n

In telecommunications, the term point\u2011to\u2011multipoint (P2MP)<\/strong> refers to a one\u2011to\u2011many connection topology: a root station<\/strong> (or central node) communicates with multiple leaf stations<\/strong>. In a P2MP model, the root transmits downstream to many leaves via a shared medium (e.g., a trunk with branches), and the leaves may send data upstream to the root, but typically not to each other.<\/p>\n\n\n\n

\u25b7 P2MP vs P2P: How they differ<\/h3>\n\n\n\n

By contrast, point\u2011to\u2011point (P2P)<\/strong><\/a> is a one\u2011to\u2011one link between endpoints. P2MP<\/strong> supports an efficient footprint when a single source needs to serve multiple destinations\u2014especially in access, metro, or broadcast contexts\u2014whereas P2P offers dedicated link performance and isolation.<\/p>\n\n\n\n

\u25b7 Terminology and standard references<\/h3>\n\n\n\n

\u2011 The root node is sometimes called the ingress<\/strong> or hub, and leaf nodes or egress<\/strong> points. \u2011 In the MPLS<\/a> traffic engineering context, a P2MP LSP (label\u2011switched path)<\/strong> must support scalable branching, grafting, and pruning of leaves. \u2011 In optical network literature, P2MP can refer to passive optical networks (PONs)<\/a> or active split architectures where a single fibre path branches to multiple endpoints. <\/p>\n\n\n\n

🌐 Working Principle of P2MP in Optical Networks<\/h2>\n\n\n\n

Basic architecture<\/h3>\n\n\n\n

In an optical\u2011based P2MP network<\/strong>, a central transmitter (for example, at an Optical Line Terminal \u2013 OLT) sends optical signals through a trunk fibre, then via passive splitters or active branching to multiple Optical Network Units (ONUs)<\/a> or Remote Nodes. The downstream path is shared; upstream traffic is managed to avoid collisions (via time\u2011division multiplexing, wavelength sharing, etc.). <\/p>\n\n\n\n

Shared media and branching<\/h3>\n\n\n\n

A key feature of P2MP is the shared medium<\/strong>: downstream may use a single wavelength or frequency that is broadcast to all leaves; upstream traffic typically uses the same or common channel but is managed via scheduling. In optical P2MP, passive optical networks (PON) are a good example: one fibre from the OLT<\/a> is split passively (1:N) to many ONUs in the field.<\/p>\n\n\n\n

Optical implementation \u2013 coherent P2MP, PONs, next\u2011gen<\/h3>\n\n\n\n

Recent research highlights that coherent optics<\/strong> is being adapted for P2MP architectures\u2014optimizing cost, spectrum usage, and latency. For example, a study shows that P2MP optics can reduce transceiver cost, spectrum consumption, and the number of IP hops compared to P2P in metro ring networks. Another study addresses flexible optical transceivers for P2MP upstream PONs, tackling challenges like high peak\u2010to\u2010average power ratios. <\/p>\n\n\n\n

Key technical parameters and design considerations<\/h3>\n\n\n\n

Important parameters<\/strong> for P2MP optical networks include:<\/p>\n\n\n\n