Does The 802.11 Interfere With Bluetooth Device; Can Radio Signals Pass Through Wall; What Are Potential Factors That May Causes Interference Among Wlan Products; What's The Difference Between A Wlan And A Wwan - ZyXEL Communications P-661HW-D Series Support Note

P-661HW-D Series Support Notes
band. This includes WLAN systems (not necessarily of the type IEEE
802.11b), cordless phones, wireless medical telemetry equipment and
Bluetooth™ short-range wireless applications, which include connecting
printers to computers and connecting modems or hands-free kits to mobile
phones.

10. Does the 802.11 interfere with Bluetooth device?

Any time devices are operated in the same frequency band, there is the
potential for interference.
Both the 802.11b/g and Bluetooth devices occupy the same2.4-to-2.483-GHz
unlicensed frequency range-the same band. But a Bluetooth device would not
interfere with other 802.11 devices much more than another 802.11 device
would interefere. While more collisions are possible with the introduction of a
Bluetooth device, they are also possible with the introduction of another 802.11
device, or a new 2.4 GHz cordless phone for that matter. But, BlueTooth
devices are usually low-power, so the effects that a Bluetooth device may have
on an 802.11 network, if any, aren't far-reaching.

11. Can radio signals pass through wall?

Transmitting through a wall is possible depending upon the material used in its
construction. In general, metals and substances with a high water content do
not allow radio waves to pass through. Metals reflect radio waves and concrete
attenuates radio waves. The amount of attenuation suffered in passing through
concrete will be a function of its thickness and amount of metal re-enforcement
used.
12. What are potential factors that may causes interference among WLAN
products?
Factors of interference:
(1) Obstacles: walls, ceilings, furniture... etc.
(2) Building Materials: metal door, aluminum studs.
(3) Electrical devices: microwaves, monitors, electric motors.
Solution:
(1) Minimizing the number of walls and ceilings
(2) Antenna is positioned for best reception
(3) Keep WLAN products away from electrical devices, eg: microwaves,
monitors, electric motors,..., etc.
(4) Add additional APs if necessary.

13. What's the difference between a WLAN and a WWAN?

WLANs are generally privately owned, wireless systems that are deployed in a
corporation, warehouse, hospital, or educational campus setting. Data rates
are high and there are no per-packet charges for data transmission.
WWANs are generally publicly shared data networks designed to provide
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