Product Specs

Packet Modem Spec Rev6.doc 15 06/09/00
session. The module has been operability tested with the following standard operating
systems:
• Windows 95/98/2000
• Windows NT
• Mac OS
• Palm OS
• Unix / LINUX
4.2.3.2 Dormant Mode Service :
The Globalstar system has the ability to keep the IP session “up” at the application layer
(host and terminal end) while dropping the air link / traffic channel, to conserve
Globalstar resources, and to decrease billing time to the end user. The traffic channel is
automatically reestablished upon receipt of PPP traffic at the host or terminal end. The
Globalstar system then completes the transmission, with no loss of user data. Dormant
Mode can be commanded at the Terminal End via AT commands, or it can be
automatically entered by the channel remaining inactive for a user specified time.
• Dormant mode default values is currently =0 or none. The user can specify a
time between 20 secs and 120 seconds for the dormant mode time to time out
and tear down the traffic channel.
• Dormant mode can also be entered by issuing a specific AT command to the
module, versus using the ATH (Hang Up command), which would drop the
traffic channel and the session.
During Dormant Mode operations each use of the traffic channel to send and receive
PPP data will produce one billing record (called a Call Detail Record or CDR).
4.2.3.3 GSP 1620 Terminal (IP) Addressing
The OEM or Service Provider must choose one of two addressing schemes
depending on the intended use of the modem. If the module is expected to be
mobile and roam between gateway service areas then Dynamic Addressing
should be used, where each GW assigns a IP address whenever the modem
and terminal equipment set up a session. Otherwise if the unit is “fixed” in
its position and no mobility is involved then a fixed IP addressing scheme
should be used.
The difference is that in a “fixed” addressing scheme it is possible to initiate
remotely “module” terminated IP packet data calls, since the IP address is
always known. In the “dynamic” scheme the Terminal / Modem will have to
initiate a call / IP session so the host or DNS server knows what the IP
address is, upon the session being established.
4.2.3.4 Dynamic IP Addressing:
The Gateway uses a Private IP addressing scheme, to assign IP addresses to all GSP 1620
modems as well as the GSP 1600 Tri-Mode Phone. With a dynamically assigned IP
address, you can ROAM to another Gateway and re-establish Packet Data service, by