Cisco Cisco Aironet 350 Wireless Bridge 정보 가이드
Wireless devices that are stored on the aircraft for use at the gate must meet certification
requirements for the country that the local carrier is flagged for, and must be able to operate
in the frequency band of the host country, unless a waiver is granted to the system user. It is
the responsibility of the system installer to obtain all licenses and frequency or usage waivers.
requirements for the country that the local carrier is flagged for, and must be able to operate
in the frequency band of the host country, unless a waiver is granted to the system user. It is
the responsibility of the system installer to obtain all licenses and frequency or usage waivers.
Q. What is channel interference?
A. When radios on multiple access points share the same channel or nearby channel, then the
frequency band overlaps with other devices. The information transmitted is lost if there is any
channel interference. Refer to Troubleshooting Problems Affecting Radio Frequency
Communication for more information on how to overcome problems with channel
interference.
frequency band overlaps with other devices. The information transmitted is lost if there is any
channel interference. Refer to Troubleshooting Problems Affecting Radio Frequency
Communication for more information on how to overcome problems with channel
interference.
Q. What is World Mode?
A. Generally a wireless client can operate only in its Local Regulatory domain as channel and
power settings carry for each domain. When World Mode is used, a client can automatically
adjust channel and power settings according to the domain it migrates to. For example, if a
user travels from the United States to Japan a client card that implements World Mode can
automatically adjust its channel and power settings as per the Japan domain. The access point
(AP) should also support World Mode for this to work. The Cisco client card and AP support
World Mode.
power settings carry for each domain. When World Mode is used, a client can automatically
adjust channel and power settings according to the domain it migrates to. For example, if a
user travels from the United States to Japan a client card that implements World Mode can
automatically adjust its channel and power settings as per the Japan domain. The access point
(AP) should also support World Mode for this to work. The Cisco client card and AP support
World Mode.
Q. Are the WLAN cards safe to use from a health perspective since they
use microwave frequencies?
use microwave frequencies?
A. The WLAN devices are safe when used under normal operating conditions as stated in the
user manuals. The power levels are below the power level of a typical microwave oven. The
radio modules were tested by independent test labs in accordance with various recognized
standards. The levels measured when the PCMCIA antenna was 1 cm away from the user
were recorded at 10−12% of the maximum level allowed.
user manuals. The power levels are below the power level of a typical microwave oven. The
radio modules were tested by independent test labs in accordance with various recognized
standards. The levels measured when the PCMCIA antenna was 1 cm away from the user
were recorded at 10−12% of the maximum level allowed.
Q. The FCC limits the maximum system power to 4 watts Effective
Isotropically Radiated Power (EIRP) for non point−to−point systems.
However, a properly tested and certified system is allowed to exceed the
4 watt EIRP for a point−to−point system. I have two parabolic dishes
aimed at an Omni. Can I exceed the 4 watt EIRP limit if I consider each
leg point−to−point?
Isotropically Radiated Power (EIRP) for non point−to−point systems.
However, a properly tested and certified system is allowed to exceed the
4 watt EIRP for a point−to−point system. I have two parabolic dishes
aimed at an Omni. Can I exceed the 4 watt EIRP limit if I consider each
leg point−to−point?
A. No. The FCC defines the system that uses directional gain antennas as only part of the
complete system. You cannot exceed the 4W EIRP for any of the legs of this system since the
whole system is a point−to−multipoint. This topic is defined in FCC docket 96−8, which
covers the spread spectrum transmitter.
complete system. You cannot exceed the 4W EIRP for any of the legs of this system since the
whole system is a point−to−multipoint. This topic is defined in FCC docket 96−8, which
covers the spread spectrum transmitter.
Q. My WLAN system sees radio frequency interference (RFI) or
electromagnetic interference (EMI) from another device. What can I do?
electromagnetic interference (EMI) from another device. What can I do?
A. Relocate the Cisco Aironet equipment as far away as practical from potential sources of
EMI/RFI or reorient the point−to−point antennas away from the RFI/EMI emitter.
EMI/RFI or reorient the point−to−point antennas away from the RFI/EMI emitter.
Use a different frequency range for the phone and WLAN.