很不错的xml解析工具，有助你理解xml的用法

AT命令文档，有详细的说明。英文的-AT command documentation, contains a detailed description.

XMODEM/YMODEM PROTOCOL REFERENCE

通过猫实现计算机之间的通信，它是属于串口通信的类型。-Implementation through the cats of the communications between computers, it is belong to the type of serial communication.

ADSL 接入技术已成为终端用户最主要的宽带接入技术。ADSL 技术的关键是ADSL 调制解调器,即ADSL MODEM。ADSL 用户端调制解调器驱动器是一个宽频带功率放大器,他能不失真放大和传输电话线上已编码的数字信号。 本文通过对ADSL 调制解调器驱动器特点、结构和性能的分析,给出了一种ADSL 用户端MODEM 驱动器的实现电路。该 电路采用具有优良高频的双功率放大器L T1886 ,即使在配置高电平的闭环增益网络后也能保持较低的失真。-ADSL access technology has become the most important end-user broadband access technology. ADSL technology is the key to ADSL modem, that is, ADSLMODEM. ADSL modem client driver is a broadband power amplifier, the distortion that he can not enlarge and transfer telephone lines have been encoded digital signal. Based on the ADSL modem driver characteristics, structure and performance analysis, we give a ADSL client realize MODEM driver circuit. The circuit has an excellent high-frequency power amplifier of the dual-L T1886, even though high in the configuration of the closed-loop gain network also able to maintain low distortion.

Make and answer phone calls Detect tone and pulse digit from the phone line Capture Caller ID Support blind transfer, single-step transfer/conference, consultation transfer/conference, hold, unhold. Control of the local phone handset, microphone and speaker of the modem Send and receive faxes Play and record on the phone line or sound card Play music in background mode Silence detection VU Meter Wave sound editor that allows your end-users to edit their own sound files. Voice recognition and voice synthesis. Full control over the serial port device ZModem file transfer utility File compression and encryption utility

MODEM编程，实现拨号，应答，通信。开发环境为VC6.0-MODEM programming, dial-up, response and communications. Development Environment for VC6.0

qamTx.rar:Modem Transmitter and Channel Simulator的例程,实用程序-qamTx.rar: Modem Transmitter and Channel Simulator of routines, practical procedures

自去收发传真程序，检查MODEM,自动设置，发送，接收。完全适用。-to send and receive faxes from the procedures, inspection MODEM, automatically set, sending, receiving. Fully applicable.

采用dpsk方式调制的直扩信号 -DPSK modulation methods used Direct Sequence Spread Spectrum Signal