Telecom acronyms: ISDN stands for which of the following?
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Ainternal select data nulls
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Bintegrated services digital network
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Cinterval set down next
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Dinterior sector direct none
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Einferior sector data net
Answer
Correct Answer: integrated services digital network
Explanation
Introduction / Context:ISDN is a foundational telecommunications standard that provided digital end-to-end connectivity long before modern broadband. Technicians frequently encounter the term in legacy voice/data integrations and exam contexts.
Given Data / Assumptions:
- Acronym identification question.
- Focus on the exact expansion of ISDN.
Concept / Approach:ISDN expands to integrated services digital network, describing consolidated digital services (voice, data, signaling) over the same access line. The other options are nonsense phrases.
Step-by-Step Solution:
Recall the standard expansion of ISDN.Match it to the provided options.Select the correct phrase: integrated services digital network.Verification / Alternative check:Telecom texts and standards (e.g., ITU-T) use this exact expansion.
Why Other Options Are Wrong:They are incorrect fabrications and do not describe telecommunications.
Common Pitfalls:Confusing ISDN with DSL; they are different technologies and eras.
Final Answer:integrated services digital network