Product specifications

GSP-1620 Modem Product Specification

80-99240-1 Rev. D 2-3

Packet and Asynchronous Data Service

The GSP-1620 modem handles two kinds of data connections:

• Packet — over the Internet or other TCP/IP

packet-switched network

• Asynchronous — routed through the Public Switched

Telephone Network (PSTN) to a destination modem

Figure 2-2 depicts a typical use of the GSP-1620 modem for a

Supervisory Control and Data Acquisition (SCADA)

application using packet data.

Figure 2-2 Typical Modem SCADA Application Using Packet Data

For packet data connections, the GSP-1620 modem

essentially functions as a “node” on the Internet and, with its

fixed or dynamically assigned IP address, can be addressed in

real time as often as necessary to maintain application

control over the remote devices.

Satellite

Globalstar

Gateway

Server

GSP-1620

Modem

SCADA Terminal

Control Port

Data Port

DTE

DCE

Host

Outdoor Antenna

Internet

Remote