Product specifications

GSP-1620 Modem Product Specification
80-99240-1 Rev. D 3-7
For more details about the two types of data service, see
Packet Data Service on page 3-7 and Asynchronous Data
Service on page 3-11.
Packet Data Service
Globalstar and the GSP-1620 modem offer direct Internet
connectivity by bridging the “last thousand mile” air gap
using LEO satellites. This section details the capabilities
offered by the GSP-1620 modem for user connectivity and
packet data transmission.
The GSP-1620 modem lets the application device (DTE)
connected to the modem originate or receive a “packet data
call” via standard AT commands (listed in Chapter 4, AT
Commands). It establishes a PPP session, connects to the
Internet, and then establishes a session with a host server.
Note
For a comparison of packet and asynchronous data, see Table 3-1 on
page 3-6. For information about asynchronous data service, see
Asynchronous Data Service on page 3-11.
Data Rate and Throughput
The GSP-1620 modem offers full duplex transmit and receive
at a Data port rate of 9600 bps. Discounting packet data
overhead bits, the measured effective “user” throughput (that
is, customer data) averages 7400 bps for packet data.
Networking Software and PPP Sessions
The modem uses PPP as the transport mechanism for data
packets. Standard networking software establishes,
manages, and tears down the PPP session. For example, the
networking software is compatible with Dial-Up Networking
(TCP/IP and PPP protocols) on Windows 95/98/NT/2000.