Quectel UC20 Application Note
UC20 PPP
Application Note
UMTS/HSPA Module Series
Rev. UC20_PPP_Application_Note_V1.0
Date: 2014-05-15
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UMTS/HSPA Module Series
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About the Document
History
Revision
Date
Author
Description
1.0
2014-05-15
Gralik WANG
Initial
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Contents
About the Document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 3
Table Index ................................................................................................................................................... 4
Figure Index ................................................................................................................................................. 5
1 Introduction .......................................................................................................................................... 6
2 Application Mode ................................................................................................................................. 7
3 Procedure for PPP Setup .................................................................................................................... 8
3.1. General Procedure for PPP Setup .............................................................................................. 8
3.2. Recommended Procedure for PPP Setup .................................................................................. 9
4 UART/USB for PPP Connection ....................................................................................................... 11
4.1. Data Mode and Command Mode .............................................................................................. 11
4.1.1. Switch from Data Mode to Command Mode .................................................................. 11
4.1.1.1. Use DTR Level Switch from Data Mode to Command Mode ................................. 11
4.1.1.2. Use Sequence +++ to Switch from Data Mode to Command Mode ...................... 11
4.1.2. Switch from Command Mode to Data Mode .................................................................. 12
4.1.2.1. Use ATO to Switch from Command Mode to Data Mode ....................................... 12
4.2. Terminate the Connection ..................................................................................................... 12
4.3. Handle URC in Data Mode .................................................................................................... 13
4.4. Data Carrier Detect (DCD) Function Mode ........................................................................... 13
5 PPP Dial-up in Windows .................................................................................................................... 14
5.1. Preparation ............................................................................................................................ 14
5.2. Modem Configuration ............................................................................................................ 14
5.2.1. Add a New Modem ......................................................................................................... 14
5.2.2. Configure the Modem Driver .......................................................................................... 18
5.3. Dial-up Network Configuration .............................................................................................. 20
5.3.1. Create a New Connection .............................................................................................. 20
5.3.2. Configure the Connection .............................................................................................. 21
5.3.3. Configure the Dial-up Tool.............................................................................................. 22
5.3.4. Establish the Dial-up Connection ................................................................................... 23
6 PPP Dial-up in Linux .......................................................................................................................... 25
6.1. Prepare PPPD and CHAT ..................................................................................................... 25
6.2. Create Script Files ................................................................................................................. 25
6.3. Set up PPP Connection by PPPD ......................................................................................... 26
7 Appendix A Reference ....................................................................................................................... 28
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Table Index
TABLE 1: RELATED DOCUMENTS .................................................................................................................. 28
TABLE 2: TERMS AND ABBREVIATIONS ........................................................................................................ 28
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Figure Index
FIGURE 1: PPP APPLICATION MODE ............................................................................................................... 7
FIGURE 2: GENERAL PROCEDURE FOR PPP SETUP ................................................................................... 8
FIGURE 3: FLOWCHART FOR PPP SETUP ..................................................................................................... 9
FIGURE 4: PHONE AND MODEM OPTIONS ................................................................................................... 15
FIGURE 5: ADD A NEW MODEM ..................................................................................................................... 16
FIGURE 6: SELECT MODEL OF THE MODEM ............................................................................................... 17
FIGURE 7: SELECT A PORT ............................................................................................................................ 17
FIGURE 8: INSTALLED SUCCESSFULLY ....................................................................................................... 18
FIGURE 9: CONFIGURE THE MODEM DRIVER ............................................................................................. 19
FIGURE 10: CREATE A NEW CONNECTION .................................................................................................. 20
FIGURE 11: SET UP THE NEW CONNECTION .............................................................................................. 21
FIGURE 12: CONFIGURE THE SETTING........................................................................................................ 22
FIGURE 13: CONFIGURE THE DIAL-UP ......................................................................................................... 23
FIGURE 14: ESTABLISH THE DIAL-UP CONNECTION ................................................................................. 24
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1 Introduction
This document gives a brief introduction to PPP function of Quectel standard module, including
recommended procedures for PPP setup, the mode for PPP connection, and the example for PPP dial-up
in Windows.
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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.
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3 Procedure for PPP Setup
This chapter gives the recommended procedure of PPP setup for Quectel standard module. If you want to
develop PPP application software, please read this chapter before programming.
3.1. General Procedure for PPP Setup
AT+CGREG?
+CGREG:0,1
AT+CGDCONT=1,"IP","CMNET"
OK
ATD*99#
CONNECT
7E FF 7D 23 C0 21 7D 21 7D „„
TE MT
Figure 2: General Procedure for PPP Setup
After module has registered to the GPRS network, you should set APN for PPP by AT+CGDCONT and
start PPP setup by command ATD*99#. When ATD*99# is executed, module enters into the procedure of
PPP packet interaction. The way of PPP packet interaction which Quectel module uses is on the basis of
standard Point to Point Protocol. Description about module’s packet interaction is included in Figure 3.
Please get more details about standard Point to Point Protocol from RFC 1661.
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