System information

221 02-FGB 101 544 Uen A – September 2008 21
4 Mobile Network Features
4.1 Preferred Roaming List (PRL)
The PRL contains information regarding the allowed systems and
frequency bands. The PRL structure and coding is defined in TIA/EIA IS-
683.
The W3x terminals use the configured PRL region during the system
selection and acquisition process, initially and when roaming.
4.2 Access Point Name (APN)
The APN can be set manually or automatically based on the SIM card’s
MCC and MNC. The W3x terminals include a pre-defined list with
commonly used APNs.
4.3 Mobile Network
The W3x terminals connect to the UMTS (3G) network when it is available
and, if enabled, uses the GSM/GPRS/EDGE (2G) network as fallback. It is
possible to individually enable/disable the networks.
4.3.1 Cellular Band Selection (W35 only)
In Ericsson W35 it is also possible to individually enable/disable frequency
bands used for the connection; 850, 1900 and 2100 for the 3G network and
850, 900, 1800 and 1900 for the 2G network.
4.4 RSCP Alarm Threshold
For RSCP (Receive Signal Code Power) an alarm threshold can be set and
if the current RSCP level is below the threshold value, a critical event is
sent to the syslog and is also available on the remote syslog.
4.5 Set Time/Date from Mobile Network (W35 only)
The Ericsson W35 system time and date can be configured to be set from
the mobile network. When the celltime service is initially enabled it checks
and updates the time every 2 minutes for the first 20 minutes. After that, the
synchronization occurs every 15 minutes.
As an alternative synchronization with a remote NTP server can be used
(see section 5.2.6). This is also the way that the Ericsson W30 uses.
4.6 Authentication
Authentication towards the UMTS/GSM radio network can be done via PIN
code and/or PPP username and password.