The PlayStation network has been shutdown since April 20 2011. They are working round the clock rebuilding and strengthening the system and should have it back up within a week, Early May 2011. The related question will have the latest information that has been provided and will be updated as new information becomes available see related question.
It means you have put in wrong redeem codes on psn and can't try again until 24 hours
You should contact the people that run PSN, and ask them what's wrong. I hope this helped in the tiniest bit. ~Rainbowman
It's actually known as a PSN ID. http://www.us.playstation.com/PSN/mediago
You can't. PSN stands for PlayStation Network. You can't connect a DS to PSN.
WHAT DOES PSN STAND FOR OR MEAN
by PSN you need a account to PSN
The PSP-3000 can access the PSN, yes.
If you are using the wrong firmware, trying to connect to the PSN will prompt you to download the most updated version. You need to let your PSP do this.
No, PSN is free and there is no indication that is going to change.
Yes, there is a PSN link on the Vita's LiveArea.
The password is whatever you set it as when you registered your PSN account.
System activation is where you log onto your PSN account on a PC, and register your devices (PS3, PSP, PSVita). Only systems you have activated in this way can log into your PSN account and use your PSN data.