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2.1.4.3
Technical Description
g20 provides a "java package" (Java API) that enables the developer to use g20 service. The g20 package contains functions for
controlling, monitoring and executing g20 services, such as:
Local services:
• General Purpose I/O lines
• Audio (Mic/Spkr)
• A/D Sampler
Remote services:
• SMS
• Voice call
• Circuit Data Call
• Packet Data (GPRS)
• Protocol I/F
The specific content of the g20 package is subject to change.
Note
2.2
GPRS OPERATION
2.2.1
Overview
The GPRS allows the service subscriber to send and receive data in an end-to-end packet-transfer mode, without utilizing
network resources in circuit-switched mode.
2.2.2
Features and Benefits
GPRS enables the cost-effective and efficient use of network resources for packet mode data applications:
• Always connected.
• No setup time before data transmission.
• Cost change based on current data communication (not time based).
2.2.3
Technical Description (GPRS - Class B Operation)
The g20 is attached to both GPRS and other GSM services, but can only operate one set of services at a time (GPRS or CSD).
The g20 can activate a GPRS context and at the same time be alerted for an incoming CSD call.
This functionality is available on the g20 single serial line by either of two procedure options:
Option 1:
1.
While in GPRS, listen to the RI signal (RS232) for an incoming CST call ring.
2.
Upon being interrupted by the RI signal, drop the DTR line to switch to command mode (depending on the previous DTR
configuration: AT&D).
98-08901C68-O
Product Features
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