Multi-Tech Systems CDMA Wireless Modem - Manual (Page 44)

Chapter 6 – Network Service Commands
Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C 44
C
HAPTER
6 - N
ETWORK
S
ERVICE
C
OMMANDS
Signal Quality +CSQ
Description: This command is used to ascertain the received signal strength indication (<rssi>) and the
channel frame error rate (<fer>). The exact meaning of the SQM (RSSI) value is
manufacturer defined.
Note: See Chapter 24 for Sprint® specific version of this command .
Values: <rssi>:
0-31: Valid value ranges.
255: Represents an unknown signal quality.
<fer>:
99: Not known or not detectable. Currently always returns 99.
Syntax:
Command syntax: AT+CSQ
Command Possible Responses
AT+CSQ +CSQ: <rssi>,<fer>
OK
Note: <rssi> and <fer> as defined below
Mode Preference +COPS
Description: The Mode Preference of a CDMA modem governs the basic system acquisition behavior of
the MS in conjunction with the PRL (Preferring Roaming List ) . It’s important to note that the
PRL takes precedence over mode preference when guiding the phone to a band or system.
The PRL must allow a particular band first, before the mode preference can take effect. In
other words, a mode preference change is simply a request; the PRL decides whether or not
to allow it. After execution of the +COPS command, an unsolicited +COPS: <mode> will
follow soon to confirm the new mode selection, but not in all cases. See Unsolicited Result
Codes in Chapter 3. All changes to +COPS are automatically saved in NV RAM.
Note 1: AMPS selection is available only in modems that support AMPS mode.
Note 2: Refer to Chapter 20 for AT commands that are applicable to AMPS operation.
Note 3: This command is not available in Sprint®. and Verizon. software versions.
Note 4: CDMA Only (<mode> 1) is the only available mode in RUIM software versions. An
attempt to select any other mode in RUIM software versions will result in an error return.
Values: The parameter values are the following ones:
<mode>
0: Automatic.
1: CDMA Only.
2: CDMA or AMPS only.
3: Analog only.
<term>
0: Permanent – this mode persists until another +COPS command is issued
1: Power cycle – this mode persists until power cycle is performed
Note:
1: AT+COPS by itself is a short-hand equivalent to AT+COPS=0,0.