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Chapter 6 – +C Prefix Commands

CDMA 1xEV-D0 AT Commands Reference Guide (Document S000482B) 35

+CSQ? Signal Quality

Syntax: AT+CSQ? (Read-only)

Description: Reports the received Signal Quality Measure (SQM) and Frame Error Rate (FER). The

response is in the form +CSQ: <SQM>, <FER>. If no cellular service is available, the

values reported are both 99. If the modem has acquired service but is not in an active call,

the SQM value is valid but the FER is still undetectable.

SQM Meaning

0-31 00 is lowest quality signal, 31 is the highest. This is based on received

signal strength.

99 Value not known or is not detectable.

FER Meaning

0 <0.01%

1 0.01% >= FER < 0.1%

2 0.1% >= FER < 0.5%

3 0.5% >= FER < 1.0%

4 1.0% >= FER < 2.0%

5 2.0% >= FER < 4.0%

6 4.0% >= FER < 8.0%

7 FER >= 8.0%

99 Value is not known or is not detectable.

See also !RSSI for received signal strength in dBm.

+CSS? Serving System

Syntax: AT+CSS? (Read-only)

Description: Reports the cellular band and system on which the modem is registered. The response is

in the form +CSS: <class>, <band>, <system>.

<class> Meaning

0 Current band class is unsupported by this command.

1 800 MHz Cellular

3 1900 MHz PCS

<band> Meaning

A - F Registered on a band system indicated.

Z Not registered system Meaning

0–32767 System ID of the network that the modem is currently registered with.

99999 Modem is not registered.

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Multitech CDMA Betriebsanweisung Seite 35