computer science

High-Speed Serial Interface

High-Speed Serial Interface 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 High-Speed Serial Interface rather than just read about it. In short: The High-Speed Serial Interface (HSSI) is a differential ECL serial interface standard developed by Cisco Systems and T3plus Networking primarily for use in WAN router connections. It is capable of speeds up to 52 Mbit/s with cables up to 50 feet (15 m) in length.

Key takeaways

High-Speed Serial Interface 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 High-Speed Serial Interface to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of High-Speed Serial Interface from memory before moving on to harder problems.

Reference excerpt

The High-Speed Serial Interface (HSSI) is a differential ECL serial interface standard developed by Cisco Systems and T3plus Networking primarily for use in WAN router connections. It is capable of speeds up to 52 Mbit/s with cables up to 50 feet (15 m) in length. While HSSI uses 50-pin connector physically similar to that used by SCSI-2, it requires a cable with an impedance of 110 Ω (as opposed to the 75 Ω of a SCSI-2 cable). The physical layer of the standard is defined by EIA-613 and the electrical layer by EIA-612. It is supported by the Linux kernel since version 3.4-rc2.

References

External links What is HSSI? Archived 2006-03-13 at the Wayback Machine HSSI Description

Worked examples

Example 1 — a first encounter with High-Speed Serial Interface

Start with the simplest possible case. Write down what High-Speed Serial Interface 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 High-Speed Serial Interface 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 High-Speed Serial Interface 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 High-Speed Serial Interface

In research: High-Speed Serial Interface 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 High-Speed Serial Interface 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: High-Speed Serial Interface is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer hardware stubs, Serial buses, so understanding it makes those chapters shorter.
In everyday life: Look for High-Speed Serial Interface 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 High-Speed Serial Interface in 20 minutes

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

Frequently asked questions

What is High-Speed Serial Interface in simple terms?

Why does High-Speed Serial Interface 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 High-Speed Serial Interface?

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 High-Speed Serial Interface.