About data transmission
The Nokia D211 employs the data transmission capabilities of the WLAN and GSM
network in order to send and receive data, to browse the Internet, to send
short messages and e-mail, and to establish connections with other computers,
for example.
Data connections may be made from most locations where your radio card
operates. However, it is recommended that you move the radio card to a location
where the strongest possible network signal can be obtained. When the signal is
strong, data transmission is more efficient.
The following factors may impair wireless connections:
Noise – Electronic appliances and equipment can cause radio interference. Also in
areas where radio cards are prevalent, other radio cards can impair the wireless
connection.
Introduction
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Roaming – As the radio card user moves from one WLAN access point coverage
area or GSM network cell to another, the signal strength of the channel drops. As
a consequence, the network may hand the user over to a coverage area and
frequency where the signal is stronger. Due to varying network traffic loads,
roaming may also occur when the user is stationary. Such roaming may cause
slight delays in transmission.
Electrostatic discharge – A discharge of static electricity from a finger or a
conductor may cause erroneous functions in electrical devices. The discharge may
result in unstable software operation. Network connections may become
unreliable, data may become corrupted, and transmission halted. In those cases,
end the existing connection (if any), stop the radio card, and remove it from
the PC card slot. Then re-insert the radio card into the PC card slot and try
connecting again.
Dead spots and dropouts – Dead spots are areas where radio signals cannot be
received. Dropouts occur when the radio card user passes through an area where
the radio signal is blocked or reduced by geographical or structural obstructions,
such as concrete walls.
Signal impairment – Distance and obstacles can cause signals to become out-of-
phase. They can also cause reflected signals. Both situations result in a loss of
signal strength.
Low signal strength – Due to either distance or obstacles, the radio signal
strength from a WLAN access point or GSM cell site may not be strong or stable
enough to provide a reliable connection for communication. Therefore, to ensure
the best possible communication, remember to consider the following points:
•
Data connection works best when the radio card is in a stationary position.
Attempting wireless data communication while in a moving vehicle is not
recommended. Fax transmission is more easily impaired than data or text
message transmission.
•
Do not place the radio card on a metal surface.