Specifications

Chapter 7 – Call-Related Commands
Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 103
7.20 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 for a list of
allowed combinations of subparameters.
Syntax: Test Command: AT+CBST=?
Response(s): +CBST: (list of supported<speed>s), (list of supported<name>s), (list of
supported<ce>s)
OK
Read Command: AT+CBST?
Responses: +CBST: <speed>, <name>, <ce>
OK
Write Command: AT+CBST=<speed>[, <name>[, <ce>]]
Responses: OK
ERROR
Parameters:
<speed> This value can be stored with AT&W and can be displayed with AT&V.
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 (This is the factory default value and can be restored to '7' with AT&F). It
is also the defaulted value if the parameter is omitted (7 will be assumed).
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> This value can be stored with AT&W.
0 Asynchronous modem. Default (This is the factory default value and can be restored to '0' with
AT&F).
<ce> This value can be stored with AT&W.
Transparent mode is not supported.
1 Non-transparent. Default (This is the factory default value and can be restored to '1' with AT&F).
Notes:
• If problems are encountered with CSD connections at 14.4 kbit/s, you may be required to change the Fixed
Network User Rate depending on the network. See AT^SFNUR for details.
• This command is not PIN protected.
• This command is supported in airplane mode.