Configuring network interfaces Configure PPP and external modems
Digi TransPort® Routers User Guide
358
Configure external modem support
Note The PPP use_modem field has been altered so the value indicates which modem type to use.
Value 1 indicates use of the GPRS modem. Value 2 indicates use of the external modem. By including
enough modem call control instances, you can perform multilink PPP over multiple external modems.
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1. Go to Configuration >Network >Interfaces >Advanced >External Modems.
The External Modems page contains external modem parameters. External modem support
added to GPRS builds. It is now possible to have a GPRS build that can also make outgoing PPP
connections via an external modem. It is also possible to answer incoming calls via an external
modem.
2. Configure external modem parameters:
ASY Port
The physical ASY port for the external modem.
W-WAN mode
Enables W-WAN mode.
Initialisation string n
These parameters (Initialisation string 1, Initialisation string 2, Initialisation string 3)
allow you to specify a number of command strings that are sent to the wireless module each
time a wireless connection is attempted. You can use these parameters to set non-standard
wireless operating modes.
Each string is prefixed with the characters AT before being sent to the wireless module and
they are sent to the wireless module in the order specified until an empty string is
encountered. For example, Initialisation string 3 will not be sent unless
Initialisationstring1 and Initialisation string 2 are both specified. Initialization strings are
not normally required for most applications as the router will normally be preconfigured for
correct operation with most networks.
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