Specifications

Chapter 10 – Network Service Commands
50 Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide
Set Rm Interface Protocol +CRM
Description: The numeric parameter is used to set the Rm interface protocol. The Rm interface protocol
value is affected by the current $QCMIP setting. The Rm interface protocol can be set by the
+CRM command only if $QCMIP is set to zero (Mobile IP disabled; Single IP only).
Syntax: AT+CRM=<val>
Command
Possible Responses
AT+CRM?
Note: Display the current setting.
+CRM: 0
OK
Note: Command is valid
AT+CRM=?
Note: Display the range of setting.
+CRM: (0-2)
OK
Note: Command is valid
AT+CRM=1
Note: Set to 1.
OK
Note: Command is valid
Values: <val> The default value for the +CRM parameter will be 0 if supported by the DCE.
0 Asynchronous Data
1 Packet data service, Relay Layer Rm interface
2 Packet data service, Network Layer Rm interface, PPP
Signal Quality +CSQ
Description: This command is used to ascertain the received signal strength indication (<rssi>) and the
channel frame error rate (<fer>). The algorithm used to calculate the RSSI is defined in ETSI TS
127.007.
The channel frame error rate is a function of the percentage of bad received frames in the total
number of received frames since the device was reset. The channel frame error rate is only valid
when the device is on a call.
Syntax: AT+CSQ
Command
Possible Responses
AT+CSQ
+CSQ: <rssi>,<fer>
OK
Note: <rssi> and <fer> as defined above
AT+CSQ?
+CSQ: <rssi>,<fer>
OK
Values: <rssi>
0-31 Valid value ranges. Signal strength can be computed using: dBm = 2(RSSI) - 113
0 = -113 dBm or less
1 = -111 dbm
2 - 30 = -109 to -53 dBm where one rssi step = 2 dBm.
31 = -51 dBm or greater.
99 Represents an unknown signal quality.
<fer>
0-7 Valid value ranges.
0 - <0.01%
1 - 0.01 to < 0.1%
2 - 0.1 to < 0.5%