computer science

ONmail

ONmail is a computer 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 ONmail rather than just read about it. In short: ONmail was a television-based email service run by ONdigital via their set-top boxes (STBs). It was launched on 7 March 2000 and required the user to purchase a new remote control with a slideout keyboard to type on.

Key takeaways

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

Reference excerpt

ONmail was a television-based email service run by ONdigital via their set-top boxes (STBs). It was launched on 7 March 2000 and required the user to purchase a new remote control with a slideout keyboard to type on. It used the built-in 2400 bit/s modem in the set-top box to connect to the ONdigital email centre. The service continued until 22 May 2002, when the phone line stopped accepting incoming calls following the collapse of the then-now rebranded ITV Digital on 3 May 2002.

Service launch The service became available via an over-the-air update to the ONdigital set-top box which added the OnMail interface. This was in addition to the already existing 'Inbox', which could be accessed via the main menu. This menu was never used due to limitations of the existing software.

Interface The onscreen interface was accessed via the ONdigital menu system (as opposed to the system menu which access the 'Inbox' described above). The interface was in a purple colour, as opposed to the standard green that the rest of the ONdigital software used. The user could thus distinguish it from the television functionality of the box, and because the contrast in colours made text easier to read.

Limitations The system had clear limitations in many aspects. The main one was that it could only be used to access ONmail accounts, which had the addresses @onmail.co.uk. Additionally, a problem that became increasingly salient as the service aged was that there was no way of accessing attachments via the set-top box interface. This was not only because of the limited interface, but also because of the slowness of the inbuilt modem.

Move to ONnet With the launch of the ONnet Service in June 2000, and the replacement of the 2400bit/s modem with the plug-in 56K modem of the new ONnet plug-in box, the ONmail service became accessible on set-top boxes through the ONmail web site. The website (www.onmail.co.uk) provided additional features that were lacking in the set-top box interface. Though this caused most users to switch to accessing the service through ONnet, many people still used the original interface as not all users had purchased an ONnet box. This was exacerbated by the impending launch of broadband services and the comparatively limited modem integrated in the new box.

References

External links ONmail Timeline ONnet Timeline

Worked examples

Example 1 — a first encounter with ONmail

Start with the simplest possible case. Write down what ONmail claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer 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 ONmail 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 ONmail 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 ONmail

In research: ONmail appears in computer 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 ONmail 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: ONmail is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer-related introductions in 2000, Digital television, Email devices, so understanding it makes those chapters shorter.
In everyday life: Look for ONmail 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 ONmail in 20 minutes

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

Frequently asked questions

What is ONmail in simple terms?

Why does ONmail matter?

Because it connects several computer 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 ONmail?

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 ONmail.