SITOR-ARQ is a common mode of data...

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SITOR-ARQ is a common mode of data communications in the maritime service. It is a system based on transmission bursts and acknowledgements. What is the baud, and interval between the burst transmissions:

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🔍 Key Concepts

• SITOR-ARQ burst/acknowledgement timing on HF circuits • Typical NBDP (narrow‑band direct‑printing) / telex over radio symbol rates used at sea • Realistic HF propagation delay and fading and how that affects timing between bursts

💭 Think About

• Which baud rate has been standard for most maritime telex/NBDP services: 50, 100, or 200 baud? Think about what you have seen associated with SITOR and NBDP in study materials. • For a system that sends a short burst, then waits for an acknowledgement over an HF path, would the wait time realistically be in microseconds, a few milliseconds, or a few hundred milliseconds? Why? • Look at the units carefully: compare milliseconds (ms) to microseconds (µs). Which timing seems long enough for a round‑trip over an ionospheric HF path plus processing time in both terminals?

✅ Before You Answer

• Be sure you understand the difference between baud (symbols per second) and bits per second (bps) and don’t mix them up when recalling typical NBDP speeds. • Double‑check which timing option is expressed in microseconds (µs) versus milliseconds (ms); eliminate any that are clearly too short for HF burst/ack systems. • Before choosing, ask: "Does this combination of baud rate + interval sound like the standard quoted for SITOR‑ARQ/NBDP in my GMDSS or radio‑ops notes?"

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