Vanguard 3000 Multicarrier Cellular Data Modem & IP Router PN 134732-VG3000 Rev. D| Page 24
upon startup, and to attempt reconnection if the connection is lost. Select Disable to prevent the modem
from automatically connecting upon startup. When disabled, a button will be displayed that can be used to
manually connect or disconnect the wireless WAN service.
LCP Error Count/LCP Echo Interval
These options let you define the acceptable error level above which the data link with the cellular carrier is
broken. Link Control Protocol (LCP) echoes are sent at the specified interval to test the link, and the link is
considered broken when the error count exceeds the given number. Select 0 to disable the LCP echo message.
If Auto Connect is enabled and the modem fails to connect, the unit will attempt to reconnect two times and then
make an attempt at one minute, at two minutes, at eight minutes, and then every fifteen minutes until successful.
Primary Carrier / Secondary Carrier (details)
Carrier APN
This field is visible only when the corresponding carrier supports GSM. Enter the APN provided by the carrier.
Username
If your cellular provider requires a user name, enter it here. Leave blank if not required.
Password
If your cellular provider requires a password, enter it here. Leave blank if not required.
Authentication Protocols
Select the authentication protocol used. If no protocol is selected (the default and recommended setting for
most applications), the Vanguard 3000 will try to negotiate a protocol with the cell tower if the cellular carrier
allows negotiation. If either protocol (PAP, CHAP or both) is chosen, then the Vanguard will only offer to
connect using the specified protocol(s), where PAP is Password Authentication Protocol and CHAP is
Challenge-Handshake Authentication Protocol.
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PAP: The Password Authentication Protocol is a pre-shared key method for authenticating with the
cellular provider.
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CHAP: The Challenge-Handshake Authentication Protocol is a two-way authentication scheme
between router and provider.
Note: Normally the cell provider does not require a username or password, in which case leave the User and
Password fields blank. An issue has been identified with SIMs from two carriers (AT&T and Bell Mobility) for
special applications where a username and password are required (which is uncommon but possible). In this
case, it is necessary to select either PAP or CHAP authentication to establish a data connection.
Automatic Carrier Switching
Stay on Primary until
Settings in this section allow you to set parameters so that if the modem is unable to connect to the primary carrier,
sees a low received signal strength or ECIO, or loses connection with the primary carrier for the number of minutes you
specify, the modem will switch to the secondary carrier. The switchover from primary to secondary, or vice versa, will
take 30-60 seconds, during which the device will not have network connectivity.
