Extended AT Commands Manual Page 66 of 70 2009-06-25
14. CELLULAR EXTENDED AT COMMAND SET
AT command lines containing the command set specified start with “AT” and end with a carriage
return. Default configurations appear in boldface type.

14.1.1. Cellular AT parameter commands

Table 14.85 AT parameter commands
Command Description Packet
Data STUIII
+CDS
Um Interface Data Compression. This extended-format
compound parameter controls the V.42bis data
compression function on the Um interface. The command
format is the same as for the TIA/EIA/IS-131 +DS
command.
0,1,2048,6 (Default)
Range: (0-0),(1-1),(512-65535),(6-250)
N/A N/A
+CBC?
Battery Charge.
Read-only. Returns <BCS>,<BCL>
BCS: (S=source)
0: Response to BCS will always be 0 since MT2 cannot
discriminate between battery and other power supply
sources.
BCL: (L=level)
n.n: Current source level in Volts
O N/A
+CRC=<value>
Cellular Result Codes (see Table 4.4.2-1).
0: Disable Cellular Result Codes
1: Enable Cellular Result Codes
N/A N/A
+CFC=<value>
Um Interface Fax Compression.
0: No compression (Default)
Range not supported:
1: V.42bis compression with parameters as set by the
+CDS command
2: Modified Read compression
N/A N/A