Technical data

WMO2 G900 / G1800 / G1900
WCOM/GSM/WMO2/WMO2ATDOC Friday 21 May 1999
WAVECOM confidential © 67
4.8 Data commands
4.8.1 Bearer type selection +CBST
Command syntax: AT+CBST= <speed>, <name>, <ce>
No data compression is provided and only asynchronous modem is
supported (<name> = 0).
<speed> Description Modem type
0 Autobauding None
1 (*) 300 bps V.21
2 (*) 1200 bps V.22
3 (*) 1200/75 bps V.23
4 2400 bps V.22bis
5 2400 bps V.26ter
6 4800 bps V.32
7 9600 bps V.32
8 Specific
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
(*) Only for non transparent mode
<ce> Connection element
0 Transparent only
1 Non transparent only
2 Transparent preferred
3 Non transparent preferred
Application to GSM AT+CBST=7,0,1 ask for a bearer
GSM to application OK bearer supported
Application to GSM AT+CBST=81,0,0 ask for a bearer
GSM to application +CME ERROR: 4 bearer not supported
This command applies to both outgoing and incoming data calls but in a
different way. For outgoing call the two parameters (e.g. <speed> and
<ce>) apply, whereas for incoming call only the <ce> parameter applies.
Note 1) as far as incoming calls are concerned, if <ce> is set to T only and
the network proposes NT only or vice versa then the call is released.
Note 2) older values 100 and 101 for <ce> are retained for compatibility
purpose but shallnot be used anymore, values 2 and 3 shall be used
instead.
4.8.2 Service reporting control +CR
This command enables a more detailed service reporting, in case of data
outgoing call. Before sending the CONNECT response to the application,
the GSM module will precise the type of data connection that have been
established.
These report types are:
+CR: ASYNC for asynchronous transparent
+CR: REL ASYNC for asynchronous non-transparent
Application to GSM AT+CR=0 extended reports disabled
GSM to application OK command valid
Application to GSM AT+CR=1 extended reports enabled
GSM to application OK command valid
Default value is stored in E2PROM.