MTCBA-C1-EN2-N3 Multi-Tech Systems, MTCBA-C1-EN2-N3 Datasheet - Page 46

• Manufacturer Part Number: MTCBA-C1-EN2-N3
• Description: ROUTER WIRELESS DUAL CDMA
• Manufacturer: Multi-Tech Systems
• Series: MultiModem® rCellr

Specifications of MTCBA-C1-EN2-N3

• Function: Transceiver, CDMA, Router
• Modulation Or Protocol: CDMA2000
• Frequency: 800MHz, 1.9GHz
• Applications: Verizon™ Networks (USA)
• Interface: RJ-45, RS-232
• Voltage - Supply: 9 V ~ 32 V
• Package / Case: Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 881-1066

Set Rm Interface Protocol +CRM
Description:
Syntax:
Values:
Signal Quality +CSQ
Description:
Syntax:
Values:
Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide (PN S000478C)
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).
Command syntax: AT+CRM=<val>
<val>
Note: The values 3 and 4 are currently not supported.
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.
Command syntax: AT+CSQ
<rssi>
<fer>
Command
AT+CRM?
Note: Display the current setting.
AT+CRM=?
Note: Display the range of setting.
AT+CRM=1
Note: Set to 1.
Command
AT+CSQ
AT+CSQ?
0
1
2
0-31
99
0-7
99
The default value for the +CRM parameter will be 0 if supported by the DCE.
Asynchronous Data
Packet data service, Relay Layer Rm interface
Packet data service, Network Layer Rm interface, PPP
Valid value ranges. Signal strength can be computed using: dBm = 2(RSSI) - 113
0 =
1 =
2 - 30 =
31 =
Represents an unknown signal quality.
Valid value ranges.
0 - <0.01%
1 - 0.01 to < 0.1%
2 - 0.1 to < 0.5%
3 - 0.5 to < 1.0%
4 - 1.0 to < 2.0%
5 - 2.0 to < 4.0%
6 - 4.0 to < 8.0%
7 - >= 8.0%
<FER> is not known or is not detectable.
Possible Responses
+CSQ: <rssi>,<fer>
OK
Note: <rssi> and <fer> as defined above
+CSQ: <rssi>,<fer>
OK
-113 dBm or less
-109 to -53 dBm where one rssi step = 2 dBm.
-51 dBm or greater.
-111 dbm
Possible Responses
+CRM: 0
OK
Note: Command is valid
+CRM: (0-2)
OK
Note: Command is valid
OK
Note: Command is valid
Chapter 10 – Network Service Commands
46