Which abbreviation is not approved for use when communicating with a TDD?

Which abbreviation is not approved for use when communicating with a TDD?

• A. Q
• B. GA
• C. STOP
• D. SKSK

Answer: (C)

In TDD communications, you rely on a small, standardized set of shorthand signals that control the flow of a message and avoid misreads. Go Ahead is a permission to send, so GA is an approved signal you’ll see in practice. SKSK is a recognized stop signal, signaling the other person to stop keying or that the transmission is ending, so it’s also part of the approved shorthand. Q appears in certain shorthand systems to indicate a question or call and is used within the established set of signals. STOP isn’t part of that standardized set; it’s just an ordinary word and doesn’t function as a defined control signal in TDD. Using it could lead to ambiguity or misinterpretation, whereas the approved signals have specific, universally understood meanings.

In TDD communications, you rely on a small, standardized set of shorthand signals that control the flow of a message and avoid misreads. Go Ahead is a permission to send, so GA is an approved signal you’ll see in practice. SKSK is a recognized stop signal, signaling the other person to stop keying or that the transmission is ending, so it’s also part of the approved shorthand. Q appears in certain shorthand systems to indicate a question or call and is used within the established set of signals.

STOP isn’t part of that standardized set; it’s just an ordinary word and doesn’t function as a defined control signal in TDD. Using it could lead to ambiguity or misinterpretation, whereas the approved signals have specific, universally understood meanings.