🔍 Key Concepts

• ARQ communications and how automatic repeat request works in Telex/DSC-style systems • The normal ways a coast station or ship station can intentionally clear down or break a connection • The purpose of control signals/commands (like BRK+? and KKKK) versus accidental interruptions (like typing on the keyboard)

💭 Think About

• Which option describes something that is part of the normal, orderly end of a message exchange rather than an abnormal condition? • In ARQ, what would a high error rate typically make the system or operator want to do? Continue or terminate? • Think about which actions are explicit disconnect/clear-down commands and which are just operational behavior during a message.

✅ Before You Answer

• Identify which choices represent explicit clear-down or break commands known in telex/ARQ procedures. • Decide which event is most likely considered a normal step in completing traffic rather than a fault condition. • Ask: In real operation, which of these would a coast station be least motivated to react to by immediately breaking the connection?