Quectel UC20 Application Note

UMTS/HSPA Module Series
UC20 PPP Application Note
UC20_PPP_Application_Note Confidential / Released 7 / 29
2 Application Mode
UART
USB
UART
USB
PPP
IP
Application
PPP
Radio Bearer
IP RELAY
Module
Application
TXD
RXD
CTS
RTS
DTR
DCD
RING
TXD
RXD
CTS
RTS
DTR
DCD
RING
USB_DM
USB_DP
USB_GN
USB_VBUS
USB_DM
USB_DP
USB_GND
USB_VBUS
Figure 1: PPP Application Mode
The usage of PPP (Point to Point Protocol) can be described as Figure 1. You can use either UART or
USB to realise PPP connection (please note only USB modem port could be used for PPP in the all USB
virtual ports). Module provides a PPP server to application, and application side provides PPP client to
module. Besides, application side also has to provide the following protocols: TCP/IP, HTTP, etc. When
PPP connection has been set up, the IP packet flow from application side will be transmitted to Internet by
module.
Most standard operating systems (e.g. Windows, Unix/Linux) include the PPP protocol stack. For other
operating systems which do not have existing application to set up PPP connection, it is very important to
develop an applicable application software to accomplish PPP connection first.
Quectel
Confidential

Quectel UC20 Specifications

General

Brand	Quectel
Model	UC20
Category	Control Unit
Language	English