What is one advantage of using ASCII code for data communications?
The correct answer is C: It is possible to transmit both uppercase and lowercase text. One advantage of using ASCII code for data communications is that it is possible to transmit both uppercase and lowercase text. ASCII can represent both cases simultaneously without shift codes.
ASCII has separate codes for uppercase and lowercase letters (e.g., 'A' = 65, 'a' = 97). This allows mixed-case text to be transmitted directly. Baudot and other older codes typically only have one case and require shift codes to access different character sets. ASCII's ability to handle both cases directly makes it more convenient for modern text communication. This is one reason ASCII is widely used in computer and digital communications.
Exam Tip
ASCII advantage = Uppercase and lowercase. Remember: ASCII allows transmission of both uppercase and lowercase text simultaneously without shift codes, which is an advantage over codes like Baudot.
Memory Aid
"**A**SCII **A**dvantage = **U**ppercase and **L**owercase (think 'AA = UL')"
Real-World Application
You're sending a message in ASCII: 'Hello World'. You can transmit both uppercase 'H' and 'W' and lowercase letters directly without any shift codes. With Baudot, you'd need to send shift codes to switch between letters and figures, and you typically only have one case. ASCII's ability to handle both cases makes it more convenient.
FCC Part 97.3Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. ASCII doesn't include built-in error correction features. Error correction requires additional protocols or encoding schemes on top of ASCII.
Option B: Incorrect. ASCII actually contains more information bits per character than some other codes (like Baudot's 5 bits). ASCII uses 7 or 8 bits, which is more, not fewer.
Option D: Incorrect. ASCII doesn't use shift codes. Baudot uses shift codes, but ASCII can represent all characters directly without shift codes.
题目解析
The correct answer is C: It is possible to transmit both uppercase and lowercase text. One advantage of using ASCII code for data communications is that it is possible to transmit both uppercase and lowercase text. ASCII can represent both cases simultaneously without shift codes. ASCII has separate codes for uppercase and lowercase letters (e.g., 'A' = 65, 'a' = 97). This allows mixed-case text to be transmitted directly. Baudot and other older codes typically only have one case and require shift codes to access different character sets. ASCII's ability to handle both cases directly makes it more convenient for modern text communication. This is one reason ASCII is widely used in computer and digital communications.
考试技巧
ASCII advantage = Uppercase and lowercase. Remember: ASCII allows transmission of both uppercase and lowercase text simultaneously without shift codes, which is an advantage over codes like Baudot.
记忆口诀
**A**SCII **A**dvantage = **U**ppercase and **L**owercase (think 'AA = UL')
实际应用示例
You're sending a message in ASCII: 'Hello World'. You can transmit both uppercase 'H' and 'W' and lowercase letters directly without any shift codes. With Baudot, you'd need to send shift codes to switch between letters and figures, and you typically only have one case. ASCII's ability to handle both cases makes it more convenient.
错误选项分析
Option A: Incorrect. ASCII doesn't include built-in error correction features. Error correction requires additional protocols or encoding schemes on top of ASCII. Option B: Incorrect. ASCII actually contains more information bits per character than some other codes (like Baudot's 5 bits). ASCII uses 7 or 8 bits, which is more, not fewer. Option D: Incorrect. ASCII doesn't use shift codes. Baudot uses shift codes, but ASCII can represent all characters directly without shift codes.
知识点
ASCII, Uppercase and lowercase, Data communications, Character encoding
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.