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RSSI falls below
If the received signal strength for the primary carrier falls below this number, the modem will switch to the
secondary carrier. Enter the RSSI level threshold for which if the primary carrier connection drops below, the
system will attempt to switch to the secondary carrier. (To disable automatic switching to the secondary
carrier determined by RSSI, enter 0.)
or ECIO falls below
If the ECIO for the primary carrier falls below this number, the modem will switch to the secondary carrier. (To
disable automatic switching to the secondary carrier determined by ECIO, enter 0.)
or no connection for
Enter the number of minutes for which to wait before attempting to switch to the secondary carrier if the
primary carrier connection is dropped.
Stay on Secondary until
Settings in this section allow you to set parameters so that once the modem has switched service to the secondary
carrier, it will attempt to maintain connection with the secondary carrier unless it is unable to connect, sees a low
received signal strength or ECIO, or loses connection with the secondary carrier for the number of minutes you specify.
RSSI falls below
If the received signal strength for the secondary carrier falls below this number, the modem will switch to the
primary carrier. (To disable automatic switching to the primary carrier determined by RSSI, enter 0.)
or ECIO falls below
If the ECIO for the secondary carrier falls below this number, the modem will switch to the primary carrier. (To
disable automatic switching to the primary carrier determined by ECIO, enter 0.)
or no connection for
Enter the number of minutes for which to wait before attempting to switch to the primary carrier if the
secondary carrier connection is dropped.
Return to Primary after
Enter the number of minutes the modem can stay on the secondary carrier before attempting reconnection to
the primary carrier. (To disable this setting, enter zero for the number of minutes.)
Note: Connectivity will be lost for 30-60 seconds while attempting to reconnect to the primary carrier.
3.2.2 SETTINGS
The carrier settings displayed on this page differ depending on which carrier is being used at the time.
One of the key features of GSM is the Subscriber Identity Module (SIM), commonly known as SIM card. The SIM is a
detachable smart card containing the user's subscription information. This allows the user to retain his or her
information when switching handsets or wireless devices, independent of which handset or wireless device they are
using. The SIM has a security feature which, when enabled, requires the user to enter a valid PIN before the modem
will connect to the cellular network.
Figure 21: Cell Connection —GSM Settings
Vanguard 3000 Multicarrier Cellular Data Modem & IP Router PN 134732-VG3000 Rev. D| Page 25
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