Xircom An Intel Company GEM3501 User Manual
Core Engine GSM/GPRS Modem Developer Guide Preliminary Draft: 7/6/2001
28
Part Number: 07100026, Revision: 002
Confidential
© 2001 Xircom, Inc., an Intel company All rights reserved.
All trademarks and copyrights are the property of Xircom, Inc., an Intel company
All trademarks and copyrights are the property of Xircom, Inc., an Intel company
6.1.2.2 Dual Port - Secondary Port: Packet Data Using “XGAP”
In a dual port configuration, the Secondary serial port using the Xircom GPRS
Asynchronous Protocol (XGAP) can be used for the following:
Asynchronous Protocol (XGAP) can be used for the following:
!
AT commands.
!
Voice control.
!
SMS control.
!
GPRS Packet Data.
NOTE: Since circuit switched data is streaming rather than packet based, in a dual port
configuration there is no circuit switched data capability on the Secondary serial port.
configuration there is no circuit switched data capability on the Secondary serial port.
XGAP provides the capability to split the communications traffic on the single physical
serial port into four (4) distinct virtual channels. Each virtual channel is used for one of the
following types of communications:
serial port into four (4) distinct virtual channels. Each virtual channel is used for one of the
following types of communications:
!
Command channel from host to baseband controller
!
Event channel from baseband controller to host
!
Packet data channel from host to baseband controller
!
Packet data channel from baseband controller to host
NOTE: For full details of the XGAP protocol implementation refer to the separate
document: Xircom GPRS Asynchronous Protocol (XGAP) Specification, part number
07300416.
document: Xircom GPRS Asynchronous Protocol (XGAP) Specification, part number
07300416.