Appendix G: Wireless Wide Area Network (WWAN) Settings
Tools Menu
G-11
Psion Omnii Hand-Held Computer User Manual
By default all bands supported by the installed WWAN modem are enabled. All bands that are not sup-
ported by the installed modem are greyed-out. While some modems (e.g. Cinterion PH8-P) allow all possible
combinations of supported bands to be selected, others do not (e.g. Cinterion MC75i). A warning is dis-
played if an unsupported band combination is chosen.
By enabling only bands in use on a given network, the network search time (e.g. after losing the network
due to a coverage gap) is improved. Through the band configuration it is possible to force the modem into
GSM-only or UMTS-only mode. As an example, this is useful if a legacy application needs to use a dial-up
connection and the network supports dial-up connections only on GSM but not on UMTS (as is the case with
many European networks).
Enable Automatic Time Update
If this feature is enabled, it allows the system time and time zone to be updated with information received
from the WWAN network. This feature is network-dependent. If the WWAN network supports NITZ (“Net-
work Information and Time Zone”), then it can send the current time, time zone, or both to the terminal.
G.1.4.4
Driver Mode Configuration
By default, the Wireless WAN driver is enabled (the
Enable driver
check box is checked). If the
Enable driver
check box is not checked, the driver is shut down as soon as the
OK
button in the
Driver Mode
dialog box is
chosen.
If, on the other hand, the Wireless WAN driver is not running and the
Enable driver
check box is checked,
the Wireless WAN driver is started as soon the
Driver Mode
dialog box is closed using the
OK
button.
Since all currently supported GSM modems are automatically detected, the
Enable
automatic port detec-
tion
check box should always be checked. If this check box is not checked, a serial port can be selected
manually. This experimental feature allows the driver to be used with an internal GSM modem that was not
recognized by the automatic detection or an external GSM modem connected to a serial port of the compu-
ter through USB or through
Bluetooth
. An external modem connected to a serial port must support 115.2
kbit/s, 8bit, no parity and hardware flow control.
Important: Care must be taken when disabling bands—the wrong band will prevent the modem
from registering with the network (that is, not even emergency calls are possible
if a mistake is made).
Note: When the driver is not running, no network status or signal strength can be displayed.
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