Quectel EG91 Series Hardware Design page 19

Internet Protocol Features
SMS
(U)SIMInterfaces
Audio Features
PCM Interface
USB Interface
UART Interface
Rx-diversity
GNSS Features
EG91_Hardware_Design
Support EDGE multi-slot class 33(33 by default)
Support GMSK and 8-PSK for different MCS (Modulation and Coding
Scheme)
Downlink coding schemes: CS 1-4 and MCS 1-9
Uplink coding schemes: CS 1-4 and MCS 1-9
Max 296Kbps (DL)/Max 236.8Kbps (UL)
SupportTCP/UDP/PPP/FTP/HTTP/NTP/PING/QMI/NITZ/CMUX*/HTTPS*/
SMTP*/MMS*/FTPS*/SMTPS*/SSL*/FILE* protocols
Support PAP (Password Authentication Protocol) and CHAP (Challenge
Handshake Authentication Protocol) protocols which are usually used for
PPP connections
Text and PDU modes
Point-to-point MO and MT
SMS cell broadcast
SMS storage: ME by default
Support 1.8V and 3.0V (U)SIM cards
Support one digital audio interface: PCM interface
GSM: HR/FR/EFR/AMR/AMR-WB
WCDMA: AMR/AMR-WB
LTE: AMR/AMR-WB
Support echo cancellation and noise suppression
Used for audio function with external codec
Support 16-bit linear data format
Support long frame synchronization and short frame synchronization
Support master and slave mode, but must be the master in long frame
synchronization
Compliant with USB 2.0 specification (slave only);the data transfer rate can
reach up to 480Mbps
Used for AT command communication, data transmission,GNSS NMEA
sentences output, software debugging, firmware upgrade and voice over
USB*
Support USB serial drivers for: Windows 7/8/8.1/10, Windows CE
5.0/6.0/7.0*, Linux 2.6/3.x/4.1~4.14, Android 4.x/5.x/6.x/7.x/8.x, etc.
Main UART:
Used for AT command communication and data transmission
Baud rates reach up to 921600bps, 115200bps by default
Support RTS and CTS hardware flow control
Debug UART:
Used for Linux console and log output
115200bps baud rate
Support LTE/WCDMA Rx-diversity
Gen8C Lite of Qualcomm
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LTE Module Series
EG91 Hardware Design