Proxim CPN 65756B manual Appendix A. Outdoor Antenna Equipment

Tsunami MP.11a Antenna Installation Guide

Appendix A. Outdoor Antenna Equipment

As described previously, Proxim Corporation offers different types of outdoor antennas and cable lengths for your network design.

The directional antennas provide maximum range, but due to their narrow beamwidth, these antennas require precise antenna alignment to achieve optimal performance. The higher the antenna gain, the more precise the alignment should be.

Directional antennas are typically used to connect:

▪A Base Station Unit and a Subscriber Unit in a point-to-point link

▪A Subscriber Unit in a point-to-multipoint network

The omni-directional antennas have, by nature, an omni-directional azimuth pattern that makes them easy to install. There is also a gain beamwidth relation for omni-antennas: The higher the gain of the omni-antenna, the narrower the vertical beamwidth. In a hilly terrain, a 7dBi omni-directional antenna can be a better solution than the 10 dBi omni-directional antenna.

The 12 dBi wide-angle antenna is a good Base Station antenna for hilly terrain. It combines a wide opening angle with relatively high gain. The mounting brackets allow tilting of the antenna. This antenna also is used when the amount of traffic in a cell is too high for a single Base Station with an omni-directional antenna.

The wide-angle antenna allows dividing the cell into three sectors that each can be serviced by a Base Station.

For beamwidth and gain characteristics of the various antennas, consult the appendixes of this manual, which describe each antenna in more detail.

The length of the antenna cable also has an impact on the maximum range that can be achieved with the antenna combination (see “Cable Factor” on page 17).

Depending upon local radio regulations in a number of countries that limit the maximum output power, Proxim Corporation offers different outdoor antenna products in the various countries around the world. Data Speed of the Wireless Link

By default, the radio of Tsunami MP.11a products transmits at the highest available transmit rate.

As data transmissions at lower speeds can travel larger distances than transmissions at the highest transmit rate, the system lets you choose a lower data rate to increase the maximum range. For information about customizing the transmit rate of your system, consult the Tsunami MP.11 and MP.11a Installation and Management Guide (which is shipped with the Tsunami MP.11a).

Appendix A. Outdoor Antenna Equipment	32
CPN 65756B	Issue Date: August 2003