Multi-Tech Systems GPRS (MTMMC-G) Benutzerhandbuch

Chapter 11 – Data Commands  

Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 

98 

 

Description: 

This command determines whether or not the use of V42bis is allowed for an incoming or outgoing data 
call, if this feature is provided by the product. The intermediate result code represents current DCE-DCE 
data compression type. The format of this result code is as follows: 

+DR: NONE 

Data compression is not in use 

+DR: V42B 

Rec. V.42 bis is in use in both directions 

+DR: V42B RD 

Rec. V.42 bis is in use in receive direction only 

+DR: V42B TD 

Rec. V.42 bis is in use in transmit direction only 

The 

+DR intermediate result code, if enabled, is issued before the final result code, before the +ILRR 

intermediate report and after the service report control +CR. 

<status> 

State of the V42bis 

0 

 

Disable. Default value.

 

   

Enable  

AT+DR=<status> 

AT+DR=? 
Note: Test command 

+DR: (0-1)  
OK 

AT+DR=1 
Note: Reporting enabled 

OK 
Note: Command valid 

AT+DR? 
Note: Current value 

+DR: 1 
OK 
Note: Command valid 

 

 
 

Description:  

If this feature is provided by the product, this command controls the preferred error correcting mode for 
a data connection. It can only be used for transparent data transmission.  

 

If the MNP2 feature is provided, the product authorizes MNP error correction mode.  

Default. Disables error correction mode 

5  

Selects MNP error correction mode 

+E prefixed commands of V.25 ter are not used. 

AT\N0 
Note: no error correction 

OK 

AT\N? 
Note: Current value 

0 
OK 
Note: Command valid 

AT\N4 

+CME ERROR: 3