Product specifications

GSP-1620 Modem Product Specification
80-99240-1 Rev. D 3-13
Data Rate and Throughput
For asynchronous data, the GSP-1620 modem offers full
duplex transmit and receive at a Data port rate of somewhat
less than packet data’s 9600 bps, due to additional overhead
for asynchronous data. Similarly, the measured effective
“user” throughput (that is, customer data) is somewhat less
than the 7400 bps (average) for packet data. Asynchronous
connections take longer because of PSTN modem training
time.
Accessing Packet Data Over an Asynchronous Connection
Once an asynchronous connection has been established for
the GSP-1620 modem, it could be used to access packet data
(using protocols such as PPP or SLIP).
If PPP is used on top of asynchronous data service, the DTE
would be assigned an IP address. PPP would be required for
Internet access using asynchronous data.
Protocols such as Z-modem or Y-modem or other proprietary
protocols could be used to transfer data between the
GSP-1620 modem and the host modem, without negotiating
PPP.
Roaming and Asynchronous Data Service
The GSP-1620 modem is capable of both “fixed” operation in
one location (for example, a building, tank, pipeline, or well)
or “mobile” operation for applications on trucks, rail cars,
aircraft, or shipping containers.
For asynchronous or “dialed” data service, roaming operation
has the following characteristics:
• A host server can call the asynchronous Dial Number and
reach the modem, regardless of which Gateway service
area it is currently located in (just as voice GSP-1600
Tri-Mode Phones can roam and be reached in any
Gateway service area).