Technical information

Table Of Contents
RS232 Multiplexer Feature
3-350 AT Commands Reference Manual January 31, 2007
Multiple Channel Configuration
The configurations listed below are recommended to achieve maximum use of parallel channels
with minimum conflicts.
Two Channel Configuration
DLC1 – Data channel dedicated to CDS
DLC2 – ACCH (AT command channel; includes all AT commands except CDS related
commands)
Figure 3-17: Two-channel Configuration
Note: Between data sessions, DLC1 is IDLE (in command mode).
Four-channel Configuration
DLC1 – GRLC or Logger
DLC2 – ACCH
DLC3 – CSD
DLC4 – GPRS
Figure 3-18: Four-Channel Configuration
Note: Between sessions, the Data and GPRS channels are IDLE (in command mode).
Two virtual channels G24
D
L
C
1
App 1
External Modem
D
L
C
2
App 2
AT commands
GPRS CSD