Quectel EC25 User Manual

LTE Module Series
EC25&EC21 AT Commands Manual
EC25&EC21_AT_Commands_Manual 195 / 231
4. 8-bit a-law and 8-bit u-law data formats are not supported.
5. Bit per frame=<clock>/<sample>. For example, if <clock> is 2048K and <sample> is 8K, then bit
per frame is 256. Bit per frame should be greater than 16.
6. When slave mode is selected, master and synchronization clock should be provided for the module.
7. When a recommended codec is selected and 16K sampling rate is desired, please input <sample>.
Currently only ALC5616 supports 16K (AT+QDAI=3,0,0,5,0,1,1,1).
Example
AT+QDAI=? //Query the range.
+QDAI: (1-3,5),(0,1),(0,1),(0-5),(0-2),(0,1),(1),(1-16)
OK
AT+QDAI? //Query the current interface configuration.
+QDAI: 3,0,0,4,0,0,1,1
OK
AT+QDAI=1,1,0,4,0,0,1,1 //Set AUX PCM interface to slave, short-synchronization, 8K sample and
2048K BCLK.
OK
12.8. AT+QEEC Set Echo Cancellation Parameters
The command is used to set echo cancellation parameters.
AT+QEEC Set Echo Cancellation Parameters
Test Command
AT+QEEC=?
Response
+QEEC: (0-49),(0-65535)
OK
Read Command
AT+QEEC?
Response
+QEEC: <index>,<value>
......
+QEEC: <index>,<value>
OK
Write Command
AT+QEEC=<index>,<value>
Response
OK
ERROR

Quectel EC25 Specifications

General

Category	LTE Module
LTE TDD	B38/B40/B41
WCDMA	B1/B5/B8
GSM	850/900/1800/1900 MHz
Data rates	LTE Cat 4: 150 Mbps DL/50 Mbps UL
GNSS	GPS/GLONASS/BeiDou/Galileo/QZSS
Operating Temperature	-40°C to +85°C
Form Factor	LCC
Storage Temperature	-45°C to +90°C
SIM Interface	1.8V/3.0V
Antenna Interface	Main, Diversity, GNSS
LTE FDD	B1/B3/B5/B7/B8/B20
Interfaces	USB 2.0, UART, PCM, GPIO
Operating Voltage	3.3V - 4.3V
Protocols	TCP/IP, UDP, FTP, HTTP, HTTPS
Certifications	CE, FCC, PTCRB, GCF, RCM, IC