usr modem

There is a GPRS Modem during the development of a. Net micro framework project. We provide 5 V voltage through the serial port on the motherboard. GPRS modem design board We use txd and rxd, which correspond to the com4 on another motherboard chip. When we start to implement the GPRS Modem dialing, I want to use the GSM 7.07 standard, on the objective ter

In the previous article, we briefly listed the initialization modules involved in the modem startup process. The following sections describe each part of initialization commands and their functions. This chapter describes basic initialization and device information initialization. Basic initialization involves the initialization of the following modules: 1. initialize basic configuration information: Load or reset the

Now broadband Internet users more and more, many of whom are using the timing of ADSL. Whether the initial use of ADSL, or has been used for a period of time, may have encountered ADSL suddenly hung up, or for no reason can not dial to connect the Internet, at that time can really put the popularity of death. What should you do if these misfortunes fall on your head and in the evening? At this time must first "self-help", and then can have "heaven help" and "people help". In the use of ADSL con

In the near stage, the broadband Internet service is becoming more and more popular, among them, ADSL access mode does not need to transform external facilities, can be directly online through the telephone line. Because the user can enter the public net directly, its security is stronger than the district local area network clearly. For stand-alone users, the installation of ADSL access mode is relatively simple, most of the use of PPPoE virtual dialing way, through the crawl random IP address

This section describes the subsequent steps of the mobile phone modem startup process: energy-saving mode and security code initialization. Energy-saving mode: To reduce power consumption, mobile phone modem generally provides energy-saving mode for users to choose from. Generally, modem supports doze mode or cyclic sleep mode ). When the current

By restoring the whole process of fax, the author analyzes the analysis results obtained by mgetty-1.1.36 source code, which has reference significance. Http://hi.baidu.com/kkernel/blog/item/c331c0291b7bdef999250aa0.html Auther: Guo wenxue data: 2008.11.20Refer to the process of sending and receiving faxes from 3 types of fax machines:Http://hi.baidu.com/kkernel/blog/item/05ffd52e87e9b9574ec22663.htmlReference source code analysis of mgetty-1.1.36:PhaseModem sending command:Ate0;At +

Many ADSL Modem systems are integrated with the firewall function to protect users' systems from DoS attacks and malicious attacks from the LAN. You can also set to monitor attacks and notify users in the form of E-mail if any problem is found. If your LAN is shared with the Internet through the ADSL Modem, enabling its Firewall is a good choice, although its functions are not as powerful as professional fi

A friend took a case, but had to go on a business trip temporarily, so I called some functions for me to do it. I used to pay attention to WEB programming, but I am still unfamiliar with serial programming.ArticleA lot. Of course, it is better to count the articles in cnblogs for help. Write this into your blog for future reference, hoping to help those who need help.This section mainly describes how to use serailport to display incoming calls of modem.The incoming call display depends on the sp

Cable Modem is developed in recent years, mainly for CATV network data transmission. Most new cable networks now use fiber-optic coaxial hybrid (HFC) networks, and their huge bandwidth and relative economics make them attractive to cable companies and newly established telecoms companies. Because cable modem is a kind of equipment that provides data service on HFC network, it is usually equated with HFC bro

Many ADSL modems are integrated with firewall capabilities to protect user systems from denial of service (DoS) attacks and malicious attacks from local area networks. And can be set to monitor the attack, once the problem can be found in the form of e-mail notification users. If your local area network is through the ADSL Modem sharing the Internet, the firewall that opens it is a good choice, although its function does not have the specialized firew

Router Access ADSL configuration detailed 1, Cisco router connection to the ADSL modem configuration: Note: The case for Beijing Telecom ADSL PPPoE access, need to use a common ADSL modem and a Cisco 2500 router (dual Ethernet port), IOS 12.2 (T), Be able to realize LAN sharing Internet. This case configuration is divided into 7 steps:First step: Configure VPDN VPDN E1. The PPPoE configuration of Cisco rou