If you need a wireless solution on industrial areas like factories or warehouses, Cisco Aironet 1240AG Series Access Point would be a good option for you. The hardened case, wide range of antenna options and capabilities just make you feel that it is the best device. Unfortunately, if you have a closer look, you will see that this device only has a UTP (Copper) Ethernet port but no fiber options (Other models do not have fiber ports either). You require fiber to reach access points that are located at the far ends of a large warehouse. Moreover, you can have concerns about using a media converter from other vendors.
In this case Cisco has a solution.Cisco Aironet Power Injector Media Converter (AIR-PWRINJ-FIB) is a media converter and a Power over Ethernet (PoE) source. You just need a UTP cable between converter and Access Point. You can place the converter on a more convenient place than the access point. Thus, you do not need power cabling on the roof of the warehouse.
WARNING:This power injector only support Cisco pre-standard power. It means that it is not usable for other devices which requires 802.3af power ( e.g. Avaya IP telephone or non-cisco IP camera).
For the details please check the Cisco web site:Cisco Aironet Power Injector Media Converter