Question
What symptoms may result from other signals interfering with a PACTOR or VARA transmission?
Answer Options
- A) Frequent retries or timeouts
- B) Long pauses in message transmission
- C) Failure to establish a connection between stations
- D) All these choices are correct
Correct Answer: D
Explanation
PACTOR and VARA are both Automatic Repeat reQuest (ARQ) digital protocols, meaning the receiving station automatically requests retransmission of any data packets received with errors. If other signals interfere with the transmission, the receiver will detect errors in the packets, triggering frequent retransmission requests (retries).
If the interference is continuous or severe, the system will experience long pauses as it repeatedly attempts to send the same data, or it may fail entirely to establish an initial connection or drop an ongoing one (timeouts). All of these symptoms indicate that the interference has broken the integrity of the data stream, and the ARQ protocol is struggling to maintain the link.
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