Practical Data Communications

本书为IT专业人士提供了全面的数据通信网络设计指南,强调实用概念而非理论,覆盖光纤传输、ATM/IP、帧中继、局域网/广域网等内容。

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Complete coverage of data communication network design for IT specialists Effective data communication is vital to modern businesses. Whether sending data over short or long distances, speed, simplicity, and efficiency are of paramount importance. This new, fully updated Second Edition of Practical Data Communications is an indispensable guide for IT managers, computer scientists, system engineers, or any professional who must design or maintain data communication networks. Professionals will find it useful as a reference for precise terminology, applications, and practices in the field. The book stresses explanation and concepts rather than theory, with current practice as the underlying theme. Roger Freeman emphasizes generalized data networks and their protocols, rather than limiting the scope of the work by concentrating on proprietary systems. While most resources in the field forgo description of the underlying digital network, discussion of PSTN as well as SONET and SDH is included here in order to allow readers to better take advantage of services available from the public network. Other sections feature discussions of:

*Fiber-optic transmission
*ATM and IP
*Frame Relay
*LANs and WANs
*Last mile broadband
*Gigabit Ethernet

Written to facilitate an understanding of data communications that emphasizes practical applications rather than theory, Practical Data Communications, Second Edition serves as an excellent tutorial for students or professionals with only basic understanding of the subject.


http://rapidshare.com/files/8496340/N0471393029.zip
### UART RTSn Pin Function and Usage In serial communication using UART (Universal Asynchronous Receiver/Transmitter), the RTSn (Request to Send, active low) pin plays a crucial role in hardware flow control mechanisms. This mechanism allows two devices communicating over UART to manage data transfer rates effectively. When implementing hardware flow control, the RTSn signal indicates whether the transmitter is ready to receive more data from the receiver. Typically: - When the transmitting device has buffer space available for incoming data, it asserts the RTSn line (pulls it low). - Conversely, when buffers are full or nearly full, deasserting this line (making it high) signals that no further transmissions should occur until the line returns to an asserted state again[^1]. This handshake protocol ensures reliable data transmission without overflow issues within receiving buffers. By controlling data flow based on actual capacity rather than fixed timing intervals alone, systems can achieve higher efficiency while maintaining robustness against potential errors during transfers. For practical implementation purposes, consider configuring your UART interface settings appropriately so as to enable proper functioning of these features according to specific application requirements. ```c // Example configuration snippet enabling RTS/CTS Hardware Flow Control uart_config_t uart_config = { .baud_rate = 115200, .data_bits = UART_DATA_8_BITS, .parity = UART_PARITY_DISABLE, .stop_bits = UART_STOP_BITS_1, .flow_ctrl = UART_HW_FLOWCTRL_RTS_CTS // Enable RTS/CTS }; ``` --related questions-- 1. How does one configure UART hardware flow control options? 2. What alternatives exist besides RTS/CTS for managing data flow in serial communications? 3. Can you provide examples where disabling RTS/CTS might be beneficial? 4. In what scenarios would adjusting baud rate impact the effectiveness of RTS/CTS signaling?
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