User Manual

Wireless Nd1 PC Card and PCI Adapter
Radio waves don't really travel the same distance in all directions. Walls,
doors, elevator shafts, people, and other obstacles offer varying degrees
of attenuation, which cause the Radio Frequency (RF) radiation pattern to
be irregular and unpredictable. Attenuation is simply a reduction of signal
strength during transmission. Attenuation is registered in decibels (dB),
which is ten times the logarithm of the signal power at a particular input
divided by the signal power at an output of a specified medium. For
example, an office wall (i.e., medium) that changes the propagation of an
RF signal from a power level of 200 milliwatts (the input) to 100 milliwatts
(the output) represents 3 dB of attenuation. The following provides some
examples of the attenuation values of common office construction:
Plasterboard wall: 3dB
Glass wall with metal frame: 6dB
Cinder block wall: 4dB
Office window: 3dB
Metal door: 6dB
Metal door in brick wall: 12.4dB
Other factors that will reduce range and affect coverage area include
concrete fiberboard walls, aluminum siding, pipes and electrical wiring,
microwave ovens, and cordless phones.
What should I do if I am unable to access my e-mail or the Web page of my
ISP?
You should contact your ISP to get the full URL and then perform the
following steps:
Note: Linux users can perform steps 4 and 5 after opening a terminal.
1. Connect your broadband modem directly to one of your computers.
2. Perform the ping command by clicking Windows Start and then
Run.
3. In the Run dialog box type cmd.
4. All users should then enter the following command: ping xxx,
where xxx is the complete URL for your ISP.
5. After you get the IP address, enter the IP address in the mail server
option or in the address line of your Web browser.
file:///G|/CSO/Documentation/Documentation%20-%20Dr...20Mach-1%20PCI%20Card/User%20Guide/english/faq.html (2 of 3)10/19/2006 12:14:39 PM