Nokia 9000i owner manual Facts about wireless data transmission

Chapter 16 - Important safety information 16-3

Facts about wireless data transmission

The Nokia 9000i Communicator employs the digital data transmission capabilities of the GSM network to send faxes, short messages, e-mail and to establish connections with remote computers.

Wireless data connections can be made from most locations where your mobile phone oper- ates. However, it is recommended that you move the communicator to a location where the strongest possible cellular signal can be obtained. When the signal is strong, data transmission is efficient. In general, you should not expect the same performance from wireless cellular data communications as from landline communica- tions due to the inherent characteristics of the cellular environment.

phone interface (if on) and remove the bat- tery. Then replace the battery and establish a new cellular connection.

Dead spots and dropouts

Dead spots are areas where radio signals cannot be received. Dropouts occur when the cellular phone user passes through an area where the radio signal is blocked or reduced by geographic or structural obstructions.

Signal impairment

Distance and obstacles can cause out-of- phase reflected signals that result in a loss of signal strength.

The following factors may impair digital cellular connections:

Noise

Radio interference from electronic appliances and equipment, as well as from other mobile phones in metropolitan areas where mobile telephones are prevalent.

Handover

As the mobile phone user moves from one network cell to another, the signal strength of the channel drops and the cellular tele- phone exchange may hand the user over to a different cell and frequency, where the signal is stronger. A cell handover may also occur when the user is stationary due to varying cellular traffic loads. Such handovers may cause slight delays.

Electrostatic discharge (ESD)

A discharge of static electricity from a finger or a conductor may cause erroneous functions in electric devices. The discharge can result in “garbled” display and unstable software oper- ation. Cellular connections may become unreliable, data may be corrupted, and the transmission halted. In this case you need to end the existing call (if any), switch off the

Low signal strength

Due to either distance or obstacles, the radio signal strength from a cell site may not be strong enough or stable enough to provide a reliable cellular connection for communica- tion. Therefore, to ensure the best possible communication, remember to consider the following points:

•The data connection works best when the communicator is in a stationary position. Attempting cellular communication while in a moving vehicle is not recommended. Fax transmission is more easily impaired than data or short message transmission.

•Do not place the communicator on a metal surface.

•Check that the cellular signal strength on the communicator displays is sufficient (see Chapter 2 "Getting started: Indicators" on page 2-10 and Chapter 13 "Phone interface: Display indicators" on page 13-2 of this manual). Moving the communicator within a room especially towards a window, may result in a stronger signal. If the cellular signals are not strong enough to support a voice call, data connection should not be attempted until you can find a location with better signal reception.