science

Long Reach Ethernet

Long Reach Ethernet 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 Long Reach Ethernet rather than just read about it. In short: Long Reach Ethernet (LRE) was a proprietary networking protocol marketed by Cisco Systems, intended to support multi-megabit (5 to 15 Mbit/s) performance over telephone-grade unshielded twisted pair wiring over distances up to 5,000 feet (1.5 km). Supporting such distance ranges, LRE is technically classified as a Metropolitan area network (MAN) technology.

Key takeaways

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

Reference excerpt

Long Reach Ethernet (LRE) was a proprietary networking protocol marketed by Cisco Systems, intended to support multi-megabit (5 to 15 Mbit/s) performance over telephone-grade unshielded twisted pair wiring over distances up to 5,000 feet (1.5 km). Supporting such distance ranges, LRE is technically classified as a Metropolitan area network (MAN) technology. Technically the protocol was similar to very-high-bitrate digital subscriber line (VDSL), practically Ethernet over VDSL (EoVDSL). The technology was sometimes considered an example of Ethernet in the first mile (EFM). Several networking vendors offered compatible networking hardware, but the technology became obsolete.

Description Like standard VDSL, LRE allowed existing telephone wiring that connects an organization's offices to be used to network those offices together using standard Ethernet protocol without incurring the huge cost of deploying fiber-optic cable or limiting organizations to the bandwidth provided by modems or other digital subscriber line services. Other sample applications included Internet access to hotel rooms or college dormitories over existing installed telephone wiring. LRE was compatible with VDSL ETSI Band Plan 998. Cisco sold Cisco Catalyst model 2900 switches using Infineon Technologies PEF22822/PEB22811 VDSL QAM chipset like many other VDSL concentrators. The customer-premises equipment included the Cisco 575 desktop bridge. Products were announced in February 2001 to be available in April 2001. Infineon used the name 10BaseS for the technology, Cisco included LRE in its Mobile Office marketing effort. A few compatible devices were produced. Cisco announced end-of-sale for the LRE products in October 2006, and its explanation page was removed from their web site in 2007. HomePNA promotes similar technologies for use within a home rather than to a central office or business, with its 2.0, 3.0, and 3.1 releases. Different frequency bands are used so that VDSL and HomePNA can share the same wires.

References

External links Metanoia communications Inc. Taiwan produced products called EVA Award and EVA Aero

Worked examples

Example 1 — a first encounter with Long Reach Ethernet

Start with the simplest possible case. Write down what Long Reach Ethernet 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 Long Reach Ethernet 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 Long Reach Ethernet 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 Long Reach Ethernet

In research: Long Reach Ethernet 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 Long Reach Ethernet 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: Long Reach Ethernet is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cisco protocols, Digital subscriber line, Ethernet, so understanding it makes those chapters shorter.
In everyday life: Look for Long Reach Ethernet 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 Long Reach Ethernet in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Long Reach Ethernet 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 Long Reach Ethernet out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Long Reach Ethernet in simple terms?

Why does Long Reach Ethernet 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 Long Reach Ethernet?

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 Long Reach Ethernet.