From Ubiquiti Wiki
BeansTalk, by Gene "the Bean Planter" Greene, is a group of simple, direct, simple, easy, simple, generalized, simple help files for even the newest Ubiquiti radio user. Welcome to the Ubiquiti family!
AirOS 5.5 User Guide []
Product Specifications, Assembly Instructions and Initial Configuration Guides [] * Use the "Drop Boxes" to select the specific product that interests you.
Configuration Topic Abstracts and HyperlinksLong-range Wi-Fi Client using AirOS 5.5 []
ABSTRACT: Embedded Wi-Fi radios often have poor antennas and perform very inefficiently. Recreational Vehicle operators, boaters, campers (anyone who finds themselves at the edge of an Access Point's coverage area) are well served by replacing their built-in radios with a higher powered, external radio. For omnidirectional coverage, use a Ubiquiti PicoStation M2. For even further range, select the Ubiquiti NanoStation M2 or M2 Loco model (however, the NanoStation uses a directional antenna, requiring you to aim it at the Access Point).
Point to Point Direct Link (AirOS 5.5, Layer-2 Transparent Bridge) []
ABSTRACT: This configuration acts like a very long Cat-5 cable and allows you to link two locations wirelessly. This configuration works best when the radios at each location have a fully clear pathway between them. This includes both Line-of-Sight and Fresnel Zone clearance (the more Fresnel Zone blockage that is present, the worse the throughput will be).
Point to Point Indirect (Repeated) Link (AirOS 5.5, Layer-2 Transparent Bridge) []
ABSTRACT: This configuration acts like a very long Cat-5 cable and allows you to link two locations that do not have a fully clear pathway between them however they have a clear pathway to a mutually visible structure where a repeater may be mounted. The pathway to the mutually visible structure where the repeater is located must be both Line-of-Sight and have a clear Fresnel Zone (the more Fresnel Zone blockage that is present, the worse the throughput will be).
Wi-Fi Access Point (Hot Spot) to cover a Local Area []
ABSTRACT: This configuration will allow your Ubiquiti radio to directly serve Wi-Fi clients in a local area. The actual coverage depends on many factors, but the most important is the power level of the connected Wi-Fi devices. At distances beyond approximately 100 meters, the signal level of low powered devices (such as smart phones and small tablets) may be too poor to be detected by the AP (even though the AP is clearly received by the device). Laptops will usually work at much longer range. NOTE: Because Wi-Fi is a 2.4 GHz service, be sure to choose only 2.4 GHz Ubiquiti radios for this purpose.
EXPANDED Hot Spot by linking Access Points []
ABSTRACT: This configuration links Ubituiti Access Points (AP's) wirelessly, using a strategy called WDS Repeating. When two (or more) AP's are in range of each other, they can be linked to create a Hot Spot that can cover a larger area than a single AP can. There are limitations to this approach. Each time a signal is repeated, its throughput is cut in half. Since Ubiquiti equipment operating at full speed is capable of communicating at throughputs of approximately 100 Mbps, a two-hop link provides a "full speed" link to a mobile client with a 54 Mbps network card.
Simple, ISP-style Wide-Area Access Point []
ABSTRACT: Because the Access Point is a single radio feeding an omnidirectional antenna, this is one of the most basic configurations used by Wireless Internet Service Providers. The Access Point (AP) is most often placed at an altitude of between 10 and 30 meters; and is usually a Ubiquiti Rocket. It serves Internet data to (and receives it from) Customer Premises Equipment (CPE) that is typically mounted on rooftops of homes or businesses; these may be Ubiquiti NanoStations (for close links) or NanoBridges (for distant links). Customers connect their computers to the roof-mounted CPE through a Category-5 STP cable. Because 2.4 GHz is usually congested, the AP-to-CPE link is most often done on 5.8 GHz (though 2.4 GHz is possible with special care during planning).
Installation Topic Abstracts and HyperlinksPoE Bridging to both: (1.) Power and (2.) Ethernet-bridge Radio Clusters []
ABSTRACT: Inspired by a UBNT Support Forum  post by @Dave-D , here are several strategies to choose from when co-locating multiple PoE powered devices in a cluster. All of these require good engineering practice which includes the use of Shielded Twisted Pair Ethernet cable, such as UBNT's ToughCable Pro or ToughCable Carrier (for use in high RF environments when co-locating with FM broadcast or pager systems) that is attached to a properly designed ground system.
- Option A. - (Traditional) Two devices, two PoE's (requires a switch or router)
- Option B. - (PoE Pass-through) Two devices, one PoE (when a UBNT radio has a second Ethernet port to activate for this purpose)
- Option C. - (PoE Bridge) Two devices, two PoE's (no switch or router required, or possible)
- Option D. - (PoE Bridge and Pass-through) Three or Four devices, two PoE's
Troubleshooting Topic Abstracts and HyperlinksAlternate Flashing LED's When Powering Up Your Radio []
ABSTRACT: LED's flashing as shown in the thumbnail to the right indicate a hardware problem (radio, Ethernet cable, PoE, etc.). First, attempt to power off/on the radio to clear this state. If that fails to correct things - in very general terms - the problem is likely with either the (1) Ethernet cable termination (RJ-45), (2) Ethernet cable itself, (3) Power over Ethernet (PoE) injector or (4) the radio itself. Almost all causes are easily corrected by simply replacing the defective component. If that is your desire, begin replacing items in the order listed above. If only "option (4)" remains, you may initiate a Return Merchandise Authorization (RMA) by visiting the UBNT Product Support page (http://www.ubnt.com/support). For additional insights and troubleshooting assistance, follow the article hyperlink above.