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Developing Modem Applications
80-99208-1 Rev. D 5-5
Modem Application Scenarios
Depending on the requirements of your SCADA or OEM
application, you can configure the GSP-1620 modem to work
in many different ways, using many different features. The
following are sample scenarios for how the modem might
work in a SCADA setting:
• Scenario 1 — Full-time packet data on-demand:
❑ The modem can both generate data or accept it from
the Gateway (see Mobile-Originated Packet Data
Calls on page 5-27 and Mobile-Terminated Packet
Data Calls on page 5-27).
❑ The modem uses dormant mode, where traffic
channel is automatically reestablished upon receipt
of PPP traffic at the modem end or IP traffic at the
Gateway end (dormant mode works for packet data
only).
❑ Since the application developer is responsible for
security issues, the application might want to query
for a password or answer calls only at certain times or
only from certain phone numbers.
May require a VPN and
software to get past firewalls.
May be able to directly connect
inside a firewall.
Mobile-terminated calls
require either a fixed public IP
address, or a fixed private IP
address and VPN tunnel to
the Gateway (see
Mobile-Terminated Packet
Data Calls on page 5-27).
Mobile-terminated calls can be
achieved by having the host
modem dial the phone number
of the GSP-1620 modem.
Table 5-1. Packet vs. Asynchronous Data (continued)
Packet Data Asynchronous Data