Product Specs

Packet Modem Spec Rev6.doc 16 06/09/00
having the system automatically assign a new dynamic IP address. Only Mobile
Originated Calls may be made with Dynamic IP addresses.
4.2.3.5 Fixed IP Addressing
Fixed IP addresses may be assigned “instead” of dynamic IP addresses. With a “fixed”
IP address assigned the GSP 1620 can make Mobile Originated and receive incoming or
Mobile Terminated Calls. Private IP addresses are “decoded” from the Module’s IMSI
(International Mobile Subcriber Identity) so that precludes ROAMING between
Gateways. Fixed IP addressing, as opposed to Dynamic, is assumed to be assigned to
“fixed” GSP 1620 terminals that do not roam.
4.2.3.6 Virtual Private Network Service:
In either case, fixed or dynamic IP addressing schemes, the OEM or user will need to
establish a VPN between their host and the gateway, to support the private IP addressing
scheme used. This can be done by establishing a Point of Presence private line into the
GW and hooking directly to the router, or by establishing a SW VPN service on the
Public Internet, directly to the GW.
4.3 IS 637 Mobile Terminated Short Messaging Service
(SMS):
And additional service option allows the integrator to utilize the Short Messaging Service
on the GSP 1620. This a separate “service option” from Packet Data, and may be billed
differently by the service provider. Using Mobile Terminated SMS can allow the host
application to “send” numeric or alphanumeric messages to the module. These messages
are passed transparently out the data or control RS 232 ports to the application. No
attempt is made to construct ASCII character data by the module, so that if “control” data
is sent to the module via the SMS service option, it will be passed along transparently to
the application.
The SMS service option is fully functional even if the GSP 1620 is “up” on a packet data
call. Therefore the host application can send command and control information to the
unit, while it is in a PPP session, or idle (not in a call).
4.3.1 SMS Alerts
SMS “alerts” are asynchronous messages sent out the data or control port to
the application upon receipt of the SMS message (see single data port
operations later for more detailed explanation).
4.3.2 SMS Message Field Information:
• Length of SMS