Is there a way to telnet into the 3605/3610 APs?
Yes, you can ssh to them as long as your controller has it turned on for the AP. Go to the AP in question in the controller, click the advanced button on the AP properties tab and make sure "Enable ssh access" is checked. If not, check it and save it. GTAC can give you username and pass but I believe it's in the documentation and probably find them pretty easily on Google.