What does the word "quiet" mean in this paragraph?

[could ildg]

The paragraph is as below, I mark the word quiet with *** ***.
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One problem with distributed applications is that if no data arrives
over a long period of time, you need to wonder why. On one hand, it
could be that the other program just hasn't had any information to
send recently. On the other hand, the other program could have
crashed. TCP handles this problem by allowing you to send an "Are you
still alive?" message every so often to  ***quiet*** connections. The
way is to call setKeepAlive() with a value of true.
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Please tell me what does the word "quiet" mean, Thank you~