computer science

GG45

GG45 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 GG45 rather than just read about it. In short: GG45 (GigaGate 45) and ARJ45 (Augmented RJ45) are two related connectors for Category 7, Category 7A, and Category 8 telecommunication cabling. The GG45 interface and related implementations are developed and sold by Nexans S.A., while the ARJ45 interface and related implementations are developed and sold by Bel Fuse Inc.

Key takeaways

GG45 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 GG45 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of GG45 from memory before moving on to harder problems.

Reference excerpt

GG45 (GigaGate 45) and ARJ45 (Augmented RJ45) are two related connectors for Category 7, Category 7A, and Category 8 telecommunication cabling. The GG45 interface and related implementations are developed and sold by Nexans S.A., while the ARJ45 interface and related implementations are developed and sold by Bel Fuse Inc. The electrical performance of each is compliant with IEC 61076-3-110, as published by the International Electrotechnical Commission. Furthermore, the ARJ45 connector meets the mechanical dimensions specified in IEC 61076-3-110.

Details The GG45 and ARJ45 connectors operate in the frequency band between 600 MHz and 5 GHz with shielded twisted pair and twinax cables. To reduce crosstalk, two of the four pairs have been moved so that each pair occupies one corner. GG45 is a variant of ARJ45 that allows for cables terminated with male 8P8C (AKA RJ45) connectors to be plugged into GG45 jacks. However, GG45 cables cannot plug into 8P8C jacks as a protrusion on the socket is designed to activate a switch on the jack for the alternative contact positions. Combined with an internal system of Faraday cages, the GG45 interface therefore has plenty of headroom, plus the ability to migrate to higher speed service by upgrading to Category 7A patch cords that activate the switch in the jack. There are two main variants of GG45/ARJ45:

GG45 or ARJ45 HD is the full connector with 12 contacts, providing a Category 6 cable interface (100/250 MHz) for older devices as well as the new interface. ARJ45 HS is the version without the Cat-6–compatible contacts, for a total of 8 contacts. 1 2 3 4 5 6 7 8 |‾‾█‾█‾█‾█‾█‾█‾█‾█‾‾| Pinout of GG45 and ARJ45 HD sockets. The protrusion ▒▒▒ | | activates a switch, redirecting the 3-6 and 4-5 pairs to | | the corners on a GG45 jack (3′ and 6′, and 4′ and 5′). |_█_█____▒▒▒____█_█_| 3′6′ | | 4′5′ ARJ45 HS omits the Cat-6–compatible 3-6 and 4-5 pairs. |_|

Illustrations

Worked examples

Example 1 — a first encounter with GG45

Start with the simplest possible case. Write down what GG45 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 GG45 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 GG45 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 GG45

In research: GG45 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 GG45 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: GG45 is common in secondary-school and first-year university syllabi. It links to neighbouring topics IEC 61076-3, Networking hardware, so understanding it makes those chapters shorter.
In everyday life: Look for GG45 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 GG45 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what GG45 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 GG45 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is GG45 in simple terms?

Why does GG45 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 GG45?

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 GG45.