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Mounting Hardware
Each antenna requires some type of mounting. The standard dipole antenna simply connects to the RP-TNC
connector on the unit. Mast mount antennas are designed to mount to a variety of mast diameters and each
comes with mounting hardware for attachment. The Yagi antennas have an articulating mount option. Patch
antennas are designed to mount flat against a wall or ceiling, and ceiling-mount antennas are equipped with a
drop-ceiling cross-member attachment. The 2.4-GHz 21-dBi parabolic dish mounts to a 1.625- up to a 2.375-in.
mast. In this dish antenna, fine-threaded turn-buckles allow accurate aiming of the antenna.
For most indoor applications, a .75- or 1-in. electrical conduit provides a suitable mounting. For outdoor
applications, use a heavy galvanized or aluminum wall mast that will withstand the wind-loading rating of the
selected antenna.
Lightning Arrestors
When using outdoor antenna installations, it is always possible that an antenna will suffer damage from potential
charges developing on the antenna and cable, or surges induced from nearby lightning strikes. The Cisco Aironet
lightning arrestor is designed to protect 2.4-GHz to 5.8- GHz radio equipment from static electricity and lightning-
induced surges that travel on coaxial transmission lines. Both systems need to be properly grounded as identified
in the hardware installation manuals of the products. These protection mechanisms will not prevent damage in the
event of a direct lightning hit.
Theory of Operation
The Cisco Aironet Lightning Arrestor (Figure 5) prevents energy surges from reaching the RF equipment by the
shunting effect of the device. Surges are limited to less than 50 volts, in about .0000001 seconds (100
nanoseconds). A typical lightning surge is about .000002 (2 micro seconds).
Figure 5. Cisco Aironet Lightning Arrestor
The accepted IEEE transient (surge) suppression is .000008 seconds (8 micro seconds). The Cisco Aironet
Lightning Arrestor is a 50-ohm transmission line with a gas discharge tube positioned between the center
conductor and ground. This gas discharge tube changes from an open circuit to a short circuit almost
instantaneously in the presence of voltage and energy surges, providing a path to ground for the energy surge.
- Overview 1
- 802.11 Modulation Techniques 2
- Types of Antennas 3
- Diversity Antenna Systems 4
- Wireless LAN Design 5
- Cabling 7
- Connectors 7
- Mounting Hardware 8
- Lightning Arrestors 8
- Decibels 9
- Power Ratings 9
- Outdoor Range 10
- Fresnel Zone 10
- Regulations 11
- Frequencies and Channel Sets 13
- IEEE 802.11a Channels 15
- Table 12. Cisco Cables 20
- Table 13. Accessories 20
- 2.2 dBi Dipole 21
- 2.2 dBi Monopole 24
- 5 dBi Sector 25
- AIR-ANT1728 26
- AIR-ANT2506 27
- 6 dBi Wall Mount Directional 28
- 8.5 dBi Wall Mount 29
- 10 dBi Wall/Mast Mount YAGI 30
- AIR-ANT24120 31
- AIR-ANT1949 32
- 14 dBi Mast Mount Sector 33
- AIR-ANT3338 34
- AIR-ANT24020V-R= 35
- 5.2 dBi Wall Mount 36
- 6.5 dBi Wall Mount 37
- AIR-ANT2430V-R= 38
- AIR-ANT2440NV-R= 39
- AIR-ANT2460NP-R= 40
- 3.5 dBi Dipole 41
- 6 dBi Omnidirectional 45
- AIR-ANT5195P-R 46
- AIR-ANT5145V-R 47
- AIR-ANT5170P-R 48
- AIR-ANT5140V-R= 49
- AIR-ANT5140NV-R= 50
- AIR-ANT5160NP-R= 51
- AIR-ANT2451V-R= 52
- AIR-ANT2451NV-R= 53
- Dual Band Patch Antenna 54
- AIR-ANT2420V-N 55
- AIR-ANT2450V-N 56
- 5.5 dBi Omnidirectional 57
- 8 dBi Omnidirectional 58
- AIR-ANT5140V-N 59
- 7.5 dBi Omnidirectional 60
- AIR-ANT5180V-N 61
- AIR-ANT58G9VOA-N 62
- 9.5 dBi Mast Mount Sector 63
- 14 dBi Patch 64
- 17 dBi Sector 65
- AIR-ANT58G28SDA-N 66
- Dual Band Omnidirectional 67
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