res human access to be lim- ited to Class 1 radiation. A wireless optical network deployed in a space where a casual pass by could intercept a laser beam requires the system to be Class 1 and incapable of delivering radiation in excess of Class 1. In order to determine the classification of an FSO system, design features such as the number and size of transmitted beams, divergence, power, wave- length, pulse duration, physical size of terminals, and installation location must be considered. In addition, active safety systems that control the laser in response to a potential access event are sometimes implemented. In sum- mary, laser safety in a wireless optical network is a key parameter that all existing and future laser transceivers must comply with. 9.1.4 Major Vendors From the time when FSO technology was in the development phase until it became commercially available, it has been recognized that approximately 16 wireless optics companies have introduced their own version of FSO solutions that are targeted for different market segments. The goal of this chapter is not to explain the products of these 16 companies in great detail, but rather to point out some of the key players in this emerging technology. AirFiber's ATM-based OptiMesh product targets facility-based carriers looking to extend the reach of their existing fiber networks. Its product can be used in point-to-point, point-to-multipoint, or redundant mesh configu- rations and features shorter links for improved availability. OptiMesh con- tains two major network elements. The first element is the Roof-Top System (RTS), or node, which is equipped with two or four optical trans- ceivers, an ATM switch, a drop to the building demarcation, a control microprocessor, and software. The second element is the Element Manage- ment System (EMS), a graphical, user-friendly, crossplatform software package that manages the mesh network and each of its nodes. LightPointe Communications' Flight product overcomes the availability issue with "five 9s" (99.999 percent