Integrator’s Reference Manual
5-30 80-99208-1 Rev. D
separate Gateways. The PPP session will be dropped and
will have to be reestablished by the modem.
• Once on a new Gateway, automatic re-registration will be
performed and a new dynamic IP address will be assigned
to the modem.
• Roaming support for “fixed” IP addressing outside the
“home” Gateway service area is not currently supported.
Future design work to allow a DNS server to map IP
addresses to IMSIs is envisioned, which would permit
worldwide fixed IP address roaming.
If service alerts are enabled, a service alert is sent out the
Data/Control port whenever the Service Provider or Gateway
changes. This includes the modem changing from roaming to
home service area and vice versa.
Using Asynchronous Data
The GSP-1620 modem lets the app lication device (DTE)
connected to the modem originate or receive an asynchronous
data call. It can dial or be dialed by a modem at the host
server, connecting through the Globalstar Satellite
Communications System and the PSTN.
Figure 5-3 shows the various modems (the GSP-1620 DCE
modem, the Gateway IWF modem, and the host modem) and
other components involved in an asynchron ous data call.