For any AP to come up without being on the network, it would need to be first configured as a mesh point (or if you have an IAP-274, it would need to be configured to come up as a stand-alone AP). If you have a non-Instant AP-274, you will need a controller first, as well as another AP that is on the wired network, to build a wireless bridge from the wired AP to your AP not on the network.