What does the word 「いつの間に」 mean?


I have looked up in an online dictionary and found out that

「いつの間にか」 means before one knows.

For another question, when I have came across 「いつの間に通信」 in an instruction
manual, I'm not sure if I can translate it as 'when communication' or 'before
communication.




Its official translation, SpotPass, doesn't help understand いつの間に通信. But
Wikipedia says its literal translation is [Unnoticed
Communication](https://en.wikipedia.org/wiki/SpotPass_and_StreetPass).

いつの間に means 'unnoticed', or 'before one notices it's happening'.

> いつの間にか夏が終わってしまった。  
>  The summer had gone before I knew / all too soon.

いつの間に in いつの間に通信 implies the connection is done silently, before you are aware
it's done, even when your 3DS is closed.




Its official translation, SpotPass, doesn't help understand いつの間に通信. But
Wikipedia says its literal translation is [Unnoticed
Communication](https://en.wikipedia.org/wiki/SpotPass_and_StreetPass).

いつの間に means 'unnoticed', or 'before one notices it's happening'.

> いつの間にか夏が終わってしまった。  
>  The summer had gone before I knew / all too soon.

いつの間に in いつの間に通信 implies the connection is done silently, before you are aware
it's done, even when your 3DS is closed.

