Wireless Network

Wireless network by topologies, divisible be 2 part is:
1.Point to point
2.Point to multipoint

1.point to point
The frequency that can be used 2.5 G, 5 G, 10 G, 15 G. Wireless has to have characteristic LOS = line Of Sight. Between the both there may obstacle, but the obstacle may not into to Fresnel Zone first radius area. The way to Fresnel Zone calculation, for obstacle high and distance of two antenna can do in energy which used too must be balanced.
There must power reserve if happen rain and attenuation of atmophere. The power reserve to anticipate attenuation, that called Fading Margin. The calculation of power that need between two point with certain distance, that called Link Budget. To hardware capability, each product different each other suitable to our need. Point to point usually used to Backbone Network/trunk or high speed accsess network.

2.Point to multipoint
Frequency and calculation of power almost the same with point to point. Just point to multipoint network be able to make great network althought there is obstacle (NLOS= Not Line Of Sight). The technology which used is OFDAM (Orthogonal Frequency Division Multiplexing). That exploit obstacle as OFDM signal reflecter media that have many carrier (multi-carrier) until to purpose. Until signal that coming from any direction arrive in receiver side become strong mutually. If there is not abstacle between distance of antenna then the extent will be more large.
The future wireless technology is WIXMAX (Worldwide Interoperability for Microwave Access) that enable BTS to communication to any remote/client that different brend/multivendor, with speed that highest. Purpose to construct Metropolitan Arean Network (MAN).