Telephone exchange

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/telephone-exchange

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the core functionality?Facilitates the establishment of communication circuits between subscribers in telecommunication networks
2. What is the historical terminology?Central office (Bell System term), wire center (North American term)
3. How did telephone exchanges start?They began with human operators who plugged cords to connect calls, and later machines like Strowger switches let people dial directly.
4. Why are telephone exchanges important for emergencies?They make sure emergency calls, like 911, reach the right dispatch center quickly and reliably.

Public Switched Telephone Network (PSTN): The global network of interconnected telephone systems that enables voice communication worldwide.
Central Office (CO): A facility housing telephone switching equipment that serves a specific geographic area or telephone prefix.
Private Branch Exchange (PBX): A private telephone switching system used within a company or organization to manage internal and external calls.
Numbering Plan Area (NPA) Code: The three-digit area code used in North American telephone numbers.