Xircom EAG2919 User Manual
Eagle II GSM Radio Module Technical Manual Preliminary Draft: 08/31/00
20
Part Number: 07100017 version 00.04
© 2000 Xircom, Inc. All rights reserved.
All trademarks and copyrights are the property of Xircom, Inc.
All trademarks and copyrights are the property of Xircom, Inc.
MODES OF OPERATION
GSM supports many optional services and modes. The Eagle II module supports the
following GSM services:
following GSM services:
!
Voice communication
!
Circuit-switched data
!
Short-Message Services (SMS)
!
Group 3 Fax
!
General Packet Radio Service (GPRS)
Enabling the Transmission Modes for the GSM Services
Each of the GSM services has two modes that can be enabled separately:
!
Mobile-originated (MO): allows the making of a service request (such as, making a
telephone call or sending an SMS)
telephone call or sending an SMS)
!
Mobile-terminated (MT): allows receiving a service request (such as receiving a
telephone call or an SMS)
telephone call or an SMS)
Note: Contact your local GSM operator to ensure that the services and modes have
been provisioned for the SIM.
been provisioned for the SIM.
Voice Communication
The Eagle II module has full voice capabilities, provided the necessary connections have
been made for the speaker and microphone pins on the 60-pin I/O connector. The AT
commands and their responses to enter and receive information from the Eagle II
module. These functions include the ability for dialing, for providing on-hook or off-hook,
and for controlling other aspects of the voice call interface.
been made for the speaker and microphone pins on the 60-pin I/O connector. The AT
commands and their responses to enter and receive information from the Eagle II
module. These functions include the ability for dialing, for providing on-hook or off-hook,
and for controlling other aspects of the voice call interface.
The Eagle II module supports three vocoder compression algorithms for voice
communication: half-rate, full-rate, and enhanced full-rate (EFR)
communication: half-rate, full-rate, and enhanced full-rate (EFR)
Circuit-Switched Data
In this mode, the Eagle II module supports both of the connection modes of transmission
that are provided by GSM:
that are provided by GSM:
!
Transparent data mode delivers a service with a variable error rate, with a
guaranteed throughput and delay.
guaranteed throughput and delay.
!
Non-Transparent mode delivers a constantly low error rate but with a non-guaranteed
throughput or delay. The Non-Transparent service provides a performance that is
closest to using a modem over a fixed Public Switched Telephone Network (PSTN)
line.
throughput or delay. The Non-Transparent service provides a performance that is
closest to using a modem over a fixed Public Switched Telephone Network (PSTN)
line.
Note: All GSM service providers may not support Transparent mode. In those
cases, the Eagle II module switches automatically to Non-Transparent mode.
cases, the Eagle II module switches automatically to Non-Transparent mode.