PlayStation Network will go offline for scheduled maintenance Monday, October 15
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During maintenance, users will be unable to access the PlayStation Store on PS3 and PSP, PSN Account Management, PSN Account Registration, and they will not be able to sign into the network from the PlayStation websites.
Systems will be down from from 13:00 BST on Monday, October 15 at 1.00pm BST until Tuesday, October 16 at 2.00am BST.
PS3 owners will still be able to collect in-game trophies which will be updated to their profile once PlayStation Network is back up and running.
~ Source