Specifications

Chapter 7 – Call-Related Commands
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 84
7.19 AT+CBST Select Bearer Service Type
Description: The AT+CBST write command selects the bearer service <name>, the data rate <speed>
and the connection element <ce> to be used when data calls are originated. The settings
also apply to mobile terminated data calls, especially when single numbering scheme calls
or calls from analog devices are received (see AT+CSNS). See GSM 02.02[1] for a list of
allowed combinations of subparameters.
Test Command Syntax: AT+CBST=?
Response(s): +CBST: (list of supported<speed>s), (list of supported<name>s), (list of supported<ce>s)
OK
Read Command Syntax: AT+CBST?
Response(s): +CBST: <speed>, <name>, <ce>
OK
Write Command Syntax: AT+CBST=<speed>[, <name>[, <ce>]]
Response(s): OK, ERROR
Parameter Descriptions:
<speed>
0 Autobauding
1 300 bps (V.21)
2 1200 bps (V.22)
4 2400 bps (V.22bis)
6 4800 bps (V.32)
7 9600 bps (V.32) Default
14 14400 bps (V.34)
65 300 bps (V.110)
66 1200 bps (v.110)
68 2400 bps (V.110)
70 4800 bps (V.110)
71 9600 bps (V.110)
75 14400 bps (V.110)
<name>
0 Asynchronous modem. Default
<ce>
Transparent mode is not supported.
1 Non-transparent. Default
7.20 AT+CRLP Select Radio Link Protocol
Parameters for Originated Non-Transparent Data
Calls
Description: The AT+CRLP write command sets radio link protocol (RLP) parameters used when non-
transparent data calls are originated. The read command returns the current settings for
the supported RLP version 0.
Test Command Syntax: AT+CRLP=?
Response(s): +CRLP: (list of supported<iws>s), (list of supported<mws>s), (list of supported<T1>s), (list
of supported<N2>s)
OK
Read Command Syntax: AT+CRLP?
Response(s): +CRLP: <iws>, <mws>, <T1>, <N2>
OK
Write Command Syntax: AT+CRLP=[<iws>[, <mws>[, <T1>[, <N2>]]]]
Response(s): OK, ERROR, +CME ERROR: <err>
Parameter Descriptions:
<iws>
Interworking window size (IWF to MS)
0...61 Default is 61
<mws>
Mobile window size (MS to IWF)
0...61 Default is 61
<T1>
Acknowledgement timer (T1 in 10 ms units)
48 - 255 Default is 78
<N2>
Re-transmission attempts N2
1...255 Default is 6