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介绍交换机的设计原理，以及在设计中需要注意的地方，本文主要是一个基础新的介绍。-Introduction switch design principles, as well as in the design of places that need attention, this article is primarily a foundation for a new introduction.

Win95下的端口读写 -Serial access in Win95

非常详细地介绍了GSM模块AT指令集的每条指令的功能，并附上例子。本文是全中文教程特别适合英文不是很好的初学者。-Very detailed description of the GSM module AT command set the function of each instruction, along with examples. This article is particularly suitable for the Chinese course English is not very good for beginners.

中国电信parlayx webservice开发文档及规范-China Telecom parlayx webservice development documents and regulations

This about how I2C works-This is about how I2C works

MTP3层测试程序-ATM layer testing procedures

噪声对通信系统的影响试验程序 模仿各种噪声对不同通信系统的影响 具有很强的学习价值-noise on the communication system of testing procedures to imitate various noise on different communication systems with a strong influence of school Xi value

QFSK的调制与解调，用C写的主程序，汇编写的调制与解调的子程序-QFSK the modulation and demodulation, with the main program in C, compile writing, the modulation and demodulation of the Subprogram

smpp3.3, smpp3.4部分实现的库，支持使用com方式调用-smpp3.3, smpp3.4 partially libraries, and support the use of com Call