Cisco AIR-BR350-A-K9 Hardware Installation Guide - Page 70

Antenna System Figure 1 Lightning Arrestor Installation Appendix C Antenna Basics To antenna Lug Lockwasher Nut Ground wire 33594 To RF device The part number for the lightning arrestor is AIR-ACC3354. The lightning arrestor kit contains a lightning arrestor, an EMP grounding ring, and an instruction sheet. You can order the arrestor kit through your Cisco Aironet distributor. Antenna Cable An antenna cable introduces signal losses in the antenna system for both the transmitter and receiver. To reduce signal loss, you should minimize the cable length and use only low-loss antenna cable to connect your radio device to the antenna. Antenna Types Cisco Aironet offers several different styles of antennas in the 2.4 GHz range. Each antenna has been FCC-approved for use with the bridge. The antennas provide omnidirectional, directional, or diversity coverage and support various communication distances. Antennas are available with different gain ratings and coverage areas. Omnidirectional Antennas An omnidirectional antenna provides a 360-degree radiation pattern. This type of antenna is used when coverage in all directions is required and when communicating with wireless client devices. Antennas in this category are available in different gain ratings (typically 2.2 to 12 dBi). Directional Antennas A directional antenna provides a stronger radiation pattern in a specific direction by focusing the radiation energy to provide a greater coverage distance. Directional antennas include the Yagi antenna, the patch antenna, and the parabolic dish antenna. Cisco Aironet 350 Series Bridge Hardware Installation Guide C-4 OL-1412-01