Nokia 9290 Manuel d'utilisateur télécharger pdf (Page 19)

5.1 Introduction

Before you can start to use the Nokia 9290 Communicator

data features efficiently, you have to check the following

information from your GSM carrier:

• The cellular network that you use must support

data calls

• Data service must be activated for your SIM card

• Before you can use HSCSD data, check with your

carrier to see whether it is supported

5.2 Data call and high-speed

data options

Data call options can be handled in Internet settings.

Under Advanced settings; Connection type, Remote modem

type and other data call related information could be found

and edited.

Connection type gives two alternatives for the connection

type. The default for every IAP (Internet Access Point) is

“Normal,” which stands for normal single time slot GSM

data call. The connection speed can be either 9600 or

14400 bps, and in addition for analog calls autobauding is

the third speed option. “High speed” selects the High Speed

Circuit Switched Data (HSCSD) call. Higher transfer speeds

are achieved by reserving multiple GSM time slots for

single user.

Note: The 14400 bps speed for normal GSM data call and

HSCSD services are not basic GSM data services. These

services may not be available in all networks in all areas,

and they may require a separate subscription. If the network

does not support the call type, or it has not been enabled in

the user’s subscription, the data call may fail. Even the basic

data call services may need to be subscribed to separately.

Remote modem type defines the connection method to

be used. There are three alternatives available: Analog (for

normal modems), ISDN V.110, and ISDN V.120. The GSM

network and the remote access server or dial-in modem

pool must support the selected connection method; other-

wise, the connection attempt will fail.

Note: Analog (normal modem) connections are usually

supported in all networks. The connection time (before

the data call is established) is about 40 seconds for analog

connections and 15 seconds for ISDN connections

Maximum data speeds are 28800 bps for analog, 38400 bps

downstream for V.110 and 43200 bps downstream with

V.120. In addition, the data flow may be smoother when

using ISDN connections. These restrictions are caused

by the GSM network, and are not inherent to the Nokia

9290 Communicator.

Max. connection speed is for determining the maximum

connection speed. The GSM network may change the current

connection speed at its direction – for example, when the

network becomes congested.

Note: All HSCSD connections are always made with 14400

bps per timeslot. This speed is almost always available in the

areas where network coverage is good and the network

supports HSCSD. If the network signal quality gets weaker,

the speed is automatically downgraded to 9600 bps per

timeslot by the GSM network. The network can also decrease

the number of time slots allocated for a user if network

congestion occurs. These actions may cause fluctuations in

the data rate, and may cause the total data rate to be

smaller than the requested data rate.

These times are rough estimates and depend on the

network coverage, on the Internet service provider, and

other variables.

When HSCSD connections are used, the user may control how many timeslots are used for the connection. Some GSM

carriers may charge on slot amount usage basis; some other GSM carriers may implement a fixed charging model for HSCSD

calls. Please contact your network carrier for HSCSD coverage and charging details.

Connection type Remote modem type 1 timeslot 2 timeslots 3 timeslots

Normal data call Analog Autobauding, Not available Not available

9600 or 14400

ISDN V.110 9600 or 14400 Not available Not available

ISDN V.120 9600 or 14400 Not available Not available

High-speed data call Analog 9600 or 14400 19200 or 28800 Not available

ISDN V.110 9600 or 14400 19200 or 28800 28800 or 38400

ISDN V.120 9600 or 14400 19200 or 28800 28800 or 43200

Available connection speeds are:

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 47 48

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Nokia 9290 Manuel d'utilisateur Page 19

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