Quectel UC20 Hardware Design page 14

Internet Protocol Features
SMS
USIM Interface
Audio Features
PCM Interface
UART Interface
USB Interface
Rx-diversity
UC20_Hardware_Design
Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com.
Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from
scheme).
Downlink coding schemes: CS 1-4 and MCS 1-9
Uplink coding schemes: CS 1-4 and MCS 1-9
CSD:
CSD transmission rates: 14.4kbps non-transparent
Support Unstructured Supplementary Services Data (USSD).
Support TCP/UDP/PPP/FTP/SMTP/HTTP/FILE/MMS/SSL protocols
Support the protocols PAP (Password Authentication Protocol) and
CHAP (Challenge Handshake Authentication Protocol) usually used
for PPP connections.
Text and PDU mode
Point to point MO and MT
SMS cell broadcast
SMS storage: ME by default
Support USIM/SIM card: 1.8V, 3.0V
Support one digital audio interface: PCM interface
GSM: HR/FR/EFR/AMR/AMR-WB
WCDMA: AMR/AMR-WB
Echo cancellation and noise suppression
Used for audio function with external codec.
Support 8-bit A-law, μ-law and 16-bit linear data formats.
Support long frame sync and short frame sync.
Support master and slave mode, but must be the master in long frame
sync.
Support two UART interfaces: main UART interface and debug UART
interface.
Main UART interface:

Seven lines on main UART interface

Support RTS and CTS hardware flow control

Baud rate can reach up to 921600bps, 115200bps by default

Used for AT command, data transmission or firmware upgrade

Support multiplexing function
Debug UART interface:

Two lines on debug UART interface: DBG_TXD and DBG_RXD

Can be used for GNSS NMEA sentences output
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 output, software debug and firmware upgrade.
USB Driver: Windows XP, Windows Vista, Windows 7, Windows 8,
Windows CE5.0/6.0/7.0, Linux 2.6/3.0, Android 2.3/4.0/4.2.
Support UMTS Rx-diversity
Confidential / Released
UMTS/HSPA Module Series
UC20 Hardware Design
13 / 82