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necessary to select either PAP or CHAP authentication to get a PPP session up. (Selecting Auto will not connect.)
Selecting either PAP or CHAP will allow connection.
• Modem-to-Modem
In applications that require modems to communicate directly with each other, as compared to communicating only
with Hosts or having a Host relaying communications between two modems, carriers might assign "nearby" IP
addresses to the other modems which overlap with the network defined by Unit Status » PPP » PPP IP Address and
PPP Subnet Mask. Set this to Enable to force the PPP Subnet Mask to 255.255.255.255 to work around this.
Important: This setting may not resolve this issue in all cases. It may be necessary to request that the carrier
reassign IP addresses of some modems.
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.
• 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.
Vanguard 3000 Series Multicarrier Cellular Data Modem & IP Router PN 001-7300-100 Rev. B
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