Info found @ http://planetside.station.sony.com/faq.jsp
The facility benefits are as follows:
Amplifier Station
*Increases the radius of the Sphere of Influence (SOI)
*Activates shields on the wall turrets
*Reduces the amount of NTU consumed by 50% (friendly facilities remain operational for notably longer before needing resupplied)
Bio Lab
*Reduces respawn delay at other friendly facilities
*Upgrades medical terminals to advanced medical terminal functionality (where health and armor are repaired)
Interlink Facility
*Reveals the majority of enemy vehicles on radar when within an SOI
*Wall turrets will fire upon any of the revealed vehicles in automated form when not manned
Tech Plant
*Provides access to all vehicles except for the Galaxy dropship *Other facilities can only produce standard vehicles, but when linked to the Tech Plant they can then produce heavy assault vehicles.
Dropship Center
*The Dropship Center does not carry any link benefits of its own, but it is the only facility that has a Galaxy terminal.