science

Higher Speed PON

Higher Speed PON is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Higher Speed PON rather than just read about it. In short: Higher Speed PON (HSP), also known as G.9804, is a family of ITU-T recommendations (computer networking standards) for data links, capable of delivering shared Internet access rates up to 50 Gbit/s (gigabits per second, Gbps). Higher Speed PON is the first PON system to use digital signal processing, succeeding both single-channel XGS-PON and multi-channel NG-PON2.

Key takeaways

Higher Speed PON belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Higher Speed PON to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Higher Speed PON from memory before moving on to harder problems.

Reference excerpt

Higher Speed PON (HSP), also known as G.9804, is a family of ITU-T recommendations (computer networking standards) for data links, capable of delivering shared Internet access rates up to 50 Gbit/s (gigabits per second, Gbps). Higher Speed PON is the first PON system to use digital signal processing, succeeding both single-channel XGS-PON and multi-channel NG-PON2. It provides upgrade paths for legacy PON generations such as GPON, XG-PON, XGS-PON, and 10G-EPON.

Development Following the publication of 40 Gbps NG-PON2 in July 2015, standardization activities turned to higher speed PON. In November 2016, the Full Service Access Network (FSAN) Group released the Standards Roadmap 2.0 which indicated the development of "future optical access systems" with peak transmission rates above 10 Gbps. Concurrently, ITU-T Study Group 15 launched the G.sup.HSP project to study higher speed PON technologies, culminating in the publication of ITU-T G.sup.64 (G.sup.HSP) in February 2018. Among possible nominal line rates of 20, 25, 50, and 100 Gbps per wavelength, the January 2018 Study Group 15 Plenary Meeting selected 50 Gbps as the next generation after 10 Gbps to provide a sufficiently large increment to network capacity while remaining technically feasible for network operators. The G.9804 standard series was established and intended to consist of four main recommendations. Recommendations G.9804.1 and G.9804.2 apply to all HSP systems, whereas G.9804.3 concerns physical medium dependent layer specifications for 50 Gbps PON (50G-PON) systems only. Another recommendation, G.hsp.TWDMPMD, is under study in conjunction with IEEE working group P802.3.

Standards

G.9804.1 G.9804.1 (G.hsp.req): Higher speed passive optical networks - Requirements serves as a guide for the development of higher speed PON systems by providing examples of "services, user network interfaces, and service node interfaces" required for higher speed networks, such as higher speed single channel (TDMA-PON), higher speed multichannel (TWDM-PON), and higher speed point-to-point overlay PONs. It provides requirements for backwards compatibility with the G.9807.x series covering GPON, XG(S)-PON, and 10G-EPON systems. The standard achieved consent in July 2019, was approved in November 2019, and was amended in August 2021.

G.9804.2 G.9804.2 (G.hsp.comTC): Higher speed passive optical networks - Common transmission convergence layer specification defines the frame format and media access control method for exchange between optical line terminals (OLTs) and optical network units (ONUs) in higher speed networks. It is intended to support a variety of physical medium dependent (PMD) sublayers in all high speed PON systems and be future-proof. It was approved in September 2021.

G.9804.3 G.9804.3 (G.hsp.50Gpmd): 50-Gigabit-capable passive optical networks (50G-PON) - Physical media dependent (PMD) layer specification sets standards for the PMD sublayer of a 50 Gbps single-channel PON system (50G-PON) for residential, business, and mobile backhaul applications. It was approved in September 2021.

Technical requirements

Field trials In September 2021, researchers from Huawei and China Telecom reported network carrier lab results of a 50G-PON prototype, achieving ~40 Gbps downstream speed, ~16 Gbps upstream speed, and ~80 μs of latency on a 10 km fiber link. In October 2021, Swisscom announced the successful implementation of 50 Gbps down- and 25 Gbps upstream transmission speeds on a fixed network connection in a real network environment by upgrading the OLT line card to a 50G-PON prototype.

Internet service providers United States - Google Fiber, Frontier United Kingdom - Netomnia, Ogi Hong Kong - HKBN Chile - Mundo

References

External links ITU-T Study Group 15 Technical Flyer: Higher Speed Passive Optical Networks

Worked examples

Example 1 — a first encounter with Higher Speed PON

Start with the simplest possible case. Write down what Higher Speed PON claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Higher Speed PON before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Higher Speed PON ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Higher Speed PON

In research: Higher Speed PON appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Higher Speed PON in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Higher Speed PON is common in secondary-school and first-year university syllabi. It links to neighbouring topics ITU-T G Series Recommendations, ITU-T recommendations, so understanding it makes those chapters shorter.
In everyday life: Look for Higher Speed PON outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Higher Speed PON in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Higher Speed PON means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Higher Speed PON out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Higher Speed PON in simple terms?

Why does Higher Speed PON matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Higher Speed PON?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Higher Speed PON.