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
5.2Data 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
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 connections1. 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.
1These times are rough estimates and depend on the network coverage, on the Internet service provider, and other variables.
Available connection speeds are:
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 |
|
|
|
|
|
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 |
|
|
|
|
|
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.
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