I`m just reading JET (by Russell Blake) and there I can read: Still watching the alley, she reached her throbbing hand down and quickly went through the fallen attacker’s pockets, noting the telltale smashed ear bud wedged under his head. State-of-the-art closed-loop com gear – as expected. What could be the meaning of State-of-the-art closed-loop com gear? Could it be something like private communication channel with the highest technology level? Thank you.
The communication might be point-to-point, dedicated, etc., as Hot Licks mentions.
However, I take closed-loop com to have this established meaning:
Closed loop communication is a communication technique used to avoid misunderstandings. When the sender gives a message, the receiver repeats this back. The sender then confirms the message; thereby common is using the word “yes”. When the receiver incorrectly repeats the message back, the sender will say “negative” (or something similar) and then repeat the correct message. If the sender (person giving the message) does not get a reply back, she must repeat it until the receiver starts closing the loop. To get the attention of the receiver, the sender can use the receiver’s name or functional position, touch his or her shoulder, etc.
which is also described in the following:
Do NOT consider a message received until it is acknowledged!
We need to use closed loop communications for every relationship and especially important communications.
It might be difficult in the context of the book to make a decision on this.