Cisco Aironet 1520 Series Instrukcja Użytkownika Strona 11
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Cisco.com provides an Outdoor Bridge Range Calculation Utility for both 2.4-GHz and 5-GHz products. This utility
calculates the Fresnel zone and maximum range based upon cable types and lengths, transmitter and receiver
models, and antennas. The utility can be found at:
http://www.cisco.com/en/US/products/hw/wireless/ps458/products_tech_note09186a008009459b.shtml
A 10-dB fade margin is included for 2.4-GHz calculations, while the included 5-dB fade margin for 5-GHz
calculations is sufficient for dependable communications in all weather conditions. The distances given are only
theoretical and should only be used to determine the feasibility of a particular design.
Outdoors, every increase of 6-dB will double the distance. Every decrease of 6-dB will halve the distance. Shorter-
cable runs and higher-gain antennas can make a significant difference to the range. The following links provide
range calculations for the outdoor mesh products:
●
Cisco Aironet 1520 Series:
http://www.cisco.com/en/US/partner/products/ps11451/products_implementation_design_guides_list.htm
●
Cisco Aironet 1550 Series:
http://www.cisco.com/en/US/partner/products/ps8368/products_implementation_design_guides_list.html
Regulations
North America
Connectors
In 1985, the FCC enacted standards for the commercial use of spread-spectrum technology in the ISM frequency
bands. Spread spectrum is currently allowed in the 900-, 2400-, and 5200- MHz bands.
In 1989, the FCC drafted an amendment governing spread-spectrum systems in the unlicensed ISM band, and
Congress enacted this amendment into law in 1990. This amendment is commonly referred to as the “new rules”
or “’94 rules” because it impacts all spread-spectrum products manufactured after June 23, 1994. Products
manufactured before June 23, 1994, are not affected by the amendment.
The FCC 1994 rules are intended to discourage use of amplifiers, high-gain antennas, or other means
of significantly increasing RF radiation. The rules are further intended to discourage “home brew” systems that are
installed by inexperienced users and that - either accidentally or intentionally - do not comply with FCC regulations
for use in the ISM band.
Both the original rules and the amendments sought to enable multiple RF networks to “coexist” with minimum
impact on one another by exploiting properties of spread-spectrum technology. Fundamentally, the FCC 1994
rules intend to limit RF communications in the ISM band to a well-defined region, while ensuring multiple systems
can operate with minimum impact on one another. These two needs are addressed by limiting the type and gain of
antennas used with a given system, and by requiring a greater degree of RF energy “spreading.”
Antenna Gain and Power Output
FCC regulations specify maximum power output and antenna gain. For the UNII3 band, the FCC limits the
transmitter power to 1 watt or 30 dBm, and the antenna gain of an omnidirectional antenna to 6 dBi. For directional
antennas operating in a point-to-point system, gains of up to 23 dBi are permitted. For antennas with gain higher
than 23 dBi, the transmitter output power must be reduced 1 dB for every 1 dB above 23 dBi increase in the
antenna gain.
- 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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