Nokia 9000il Owner's Manual

Contents

Nokia 9000il Owner's Manual Manual pdf 10 page image

1-4 Facts about wireless data transmissionFacts about wireless data transmissionThe Nokia 9000il Communicator employs thedigital data transmission capabilities of the GSMnetwork to send faxes, short messages, e-mailand to establish connections with remotecomputers.Wireless data connections can be made frommost locations where your mobile phone oper-ates. However, it is recommended that you movethe communicator to a location where thestrongest possible cellular signal can be obtained.When the signal is strong, data transmission isefficient. In general, you should not expect thesame performance from wireless cellular datacommunications as from landline communica-tions due to the inherent characteristics of thecellular environment.The following factors may impair digital cellularconnections:NoiseRadio interference from electronic appliancesand equipment, as well as from other mobilephones in metropolitan areas where mobiletelephones are prevalent.HandoverAs the mobile phone user moves from onenetwork cell to another, the signal strengthof the channel drops and the cellular tele-phone exchange may hand the user over to adifferent cell and frequency, where the signalis stronger. A cell handover may also occurwhen the user is stationary due to varyingcellular traffic loads. Such handovers maycause slight delays.Electrostatic discharge (ESD)A discharge of static electricity from a fingeror a conductor may cause erroneous functionsin electric devices. The discharge can result in“garbled” display and unstable software oper-ation. Cellular connections may becomeunreliable, data may be corrupted, and thetransmission halted. In this case you need toend the existing call (if any), switch off thephone interface (if on) and remove the bat-tery. Then replace the battery and establish anew cellular connection.Dead spots and dropoutsDead spots are areas where radio signals cannotbe received. Dropouts occur when the cellularphone user passes through an area where theradio signal is blocked or reduced by geographicor structural obstructions.Signal impairmentDistance and obstacles can cause out-of-phase reflected signals that result in a loss ofsignal strength.Low signal strengthDue to either distance or obstacles, the radiosignal strength from a cell site may not bestrong enough or stable enough to provide areliable cellular connection for communica-tion. Therefore, to ensure the best possiblecommunication, remember to consider thefollowing points:• The data connection works best when thecommunicator is in a stationary position.Attempting cellular communication while ina moving vehicle is not recommended. Faxtransmission is more easily impaired thandata or short message transmission.• Do not place the communicator on a metalsurface.• Check that the cellular signal strength on thecommunicator displays is sufficient (seeChapter 2 "Getting started: Indicators" onpage 2-10 and Chapter 13 "Phone interface:Display indicators" on page 13-2 of thismanual). Moving the communicator within aroom especially towards a window, mayresult in a stronger signal. If the cellularsignals are not strong enough to support avoice call, data connection should not beattempted until you can find a location withbetter signal reception.