Multi-Tech Systems CDMA Wireless Modem manual Um Interface Data Compression +CDS

Chapter 17 – Extended AT Commands in IS707.3

Um Interface Data Compression +CDS

Description: This command is an overloaded command that serves as an unsolicited SMS command and also as a data compression command. The unsolicited SMS command is explained in Chapter 3. The data compression command has an extended-format numeric parameter that is used to control the V.42bis data compression function on the Um interface. The command format is the same as for the TIA/EIS/IS-131 +DS command.

Syntax:	Command syntax: AT+CDS=<Val>
	Command	Possible Responses
	AT+CDS?	+CDS: 0, 1, 2048, 6
	Note: Display the current setting.	OK
		Note: Command is valid
	AT+CDS=?	+CDS: (0-0),(1-1),(512-65535),(6-250)
	Note: Display the range of setting.	OK
		Note: Command is valid

Note: Currently, mobile only accept 0 as a valid setting.

Set Rm Interface Protocol +CRM

Description: The numeric parameter is used for set the Rm interface protocol.

Values:	<Val> 0: Asynchronous Data or Fax
	1: Packet data service, Relay Layer Rm interface
	2: Packet data service, Network Layer Rm interface, PPP
	Note: The values 3 and 4 are currently not supported.
	3: Packet data service, Network Layer Rm interface, SLIP
	4: STU-III Service
Syntax:	Command syntax: AT+CRM=<Val>
	Command	Possible Responses
	AT+CRM?	+CRM: 0
	Note: Display the current setting.	OK
		Note: Command is valid
	AT+CRM=?	+CRM: (0-2)
	Note: Display the range of setting.	OK
		Note: Command is valid
	AT+CRM=1	OK
	Note: Set to 1.	Note: Command is valid

Note: This default value for the +CRM parameter shall be 0 if this value is supported by the DCE.

Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C 141