engineering

Hush-A-Phone Corp. v. United States

Hush-A-Phone Corp. v. United States is a engineering 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 Hush-A-Phone Corp. v. United States rather than just read about it. In short: Hush-A-Phone v. United States, 238 F.2d 266 (D.C.

Key takeaways

Hush-A-Phone Corp. v. United States belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Hush-A-Phone Corp. v. United States to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Hush-A-Phone Corp. v. United States from memory before moving on to harder problems.

Reference excerpt

Hush-A-Phone v. United States, 238 F.2d 266 (D.C. Cir. 1956) was an important ruling in United States telecommunications decided by the D.C. Circuit Court of Appeals. Hush-A-Phone Corporation marketed a small, cup-like device which mounted on the speaking party's microphone, reducing the risk of conversations being overheard and increasing sound fidelity for the listening party. At the time, AT&T had a near-monopoly on America's phone system, even controlling the equipment attached to its network. In this era, Americans had to lease equipment from "Ma Bell" or use approved devices. At this time Hush-A-Phone had been around for 20 years without any issues. However, when an AT&T lawyer saw one in a store window, the company decided to sue on the grounds that anything attached to a phone could damage their network. AT&T, citing the Communications Act of 1934, which stated in part that the company had the right to make changes and dictate "the classifications, practices, and regulations affecting such charges," claimed the right to "forbid attachment to the telephone of any device 'not furnished by the telephone company.'" Initially, the Federal Communications Commission (FCC) ruled in AT&T's favor. It found that the device was a "foreign attachment" subject to AT&T control and that unrestricted use of the device could, in the commission's opinion, result in a general deterioration of the quality of telephone service.

Finding A federal appeals court dismissed AT&T's claim. The court's decision stated that AT&T's prohibition of the device was not "just, fair, and reasonable," as required under the Communications Act of 1934. Per the judgment, the device "does not physically impair any of the facilities of the telephone companies," nor did it "affect more than the conversation of the user." The court thus exonerated Hush-A-Phone and prohibited further interference by AT&T toward Hush-A-Phone users. After the ruling, it was still illegal to connect some equipment to the AT&T network. For example, modems could not electronically connect to the phone system. Instead, Americans had to connect their modems mechanically by attaching a phone receiver to an acoustic coupler via suction cups. Regardless, the victory for Hush-A-Phone was widely considered a watershed moment in the development of a secondary market for terminal equipment and the breakup of the Bell System. This landmark decision, and the related Carterfone decision, were seen as precursors to the entry of MCI Communications, the development of more pervasive telecom competition, and the creation of FCC regulations to let users more freely use America's phone network. These changes were perhaps best seen in 1981 when the Hayes Smartmodem electronically connected home computers to the internet for the first time.

See also Interconnection Leo Beranek - Hush-A-Phone designer Phreaking

References

External links

A copy of the court decision from the DC Court of Appeals Cybertelecom :: Customer Premises Equipment - FCC Regulations concerning attachment and marketing of CPE Voice Silencer on Telephone Lets You Talk in Secret Archived February 24, 2008, at the Wayback Machine Popular Mechanics, February 1941 FCC amendment to regulations allowing Hush-a-Phone.

Illustrations

Worked examples

Example 1 — a first encounter with Hush-A-Phone Corp. v. United States

Start with the simplest possible case. Write down what Hush-A-Phone Corp. v. United States claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, 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 Hush-A-Phone Corp. v. United States 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 Hush-A-Phone Corp. v. United States 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 Hush-A-Phone Corp. v. United States

In research: Hush-A-Phone Corp. v. United States appears in engineering 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 Hush-A-Phone Corp. v. United States 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: Hush-A-Phone Corp. v. United States is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1956 in United States case law, AT&T litigation, Federal Communications Commission litigation, so understanding it makes those chapters shorter.
In everyday life: Look for Hush-A-Phone Corp. v. United States 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 Hush-A-Phone Corp. v. United States in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hush-A-Phone Corp. v. United States 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 Hush-A-Phone Corp. v. United States out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hush-A-Phone Corp. v. United States in simple terms?

Hush-A-Phone v. United States, 238 F.2d 266 (D.C.

Why does Hush-A-Phone Corp. v. United States matter?

Because it connects several engineering 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 Hush-A-Phone Corp. v. United States?

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 Hush-A-Phone Corp. v. United States.