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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

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

Many people may not know how to use ADSL Modem to build DHCP servers. In Lan, IP Address Allocation is always a headache for administrators. After setting IP addresses for each client, you can change the IP address when you encounter "Good Guys". Either you cannot access the Internet or some software cannot run properly, causing a lot of unnecessary trouble. If we use the ADSL Modem to share the Internet, t

ADSL Modem has a CD LED or link led, by looking at the lamp's working status, you can easily identify with the ADSL modem connected to the communication line failure. Under normal working conditions, this led will be on the power supply, soon in the long bright state, if there are other abnormal states, it will indicate that there may be fault on the line, specific performance in: If the CD or link LEDs ke

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

At present, adsl modem is widely used. Many people may not understand the problem of frequent disconnection instability of adsl modem. It does not matter. After reading this article, you will certainly have a lot of GAINS, I hope this article will teach you more things. In last October, I installed the ADSL MODEM in both my unit and home to access the Internet. S

A lot of ADSL modem have encountered the problem of stop and crash, which to many ADSL end users online caused a barrier, the following analysis and give a solution. Fault characteristics 1.10 minutes to half an hour, ADSL modem on the crash, Ping ADSL modem IP, half of the pass, the delay in the thousand millisecond level. Web pages can not open, but QQ, MSN,

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

Final goal: to provide a stable and reliable Java SMS sending server under Linux. The first stage: coding and testing under the Win32 platform; Phase two: Deploy and test under Linux platform; Directory: Related resources: (Java communication package) Pre-preparation of WIN32 serial port programming Win32 SMS Modem test steps and at instructions: Pre-preparation of Linux serial port programming List all serial ports and ports of the system to find the

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

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

In the last article, we introduced the Web configuration of the first page configuration options, below, we began to introduce ADSL modem LAN-related network configuration. 2, LAN Related settings ADSL modem LAN settings related content, mainly used to set the modem LAN interface to use the IP address, as well as the modem