A transmission control character used to indicate that one or more of the following bit patterns have no correct interpretations as characters in the code or link protocol of the system 一种传送控制字符，用于指明一个或多个后继的位模式不能正确地解释为系统编码或系统链路协议中的字符。
First , i give the whole systems of proximity link by referring to the civil and abroad literature . then i introduce the concepts about level design and make the frame structure of the proximity link protocol 首先查阅并分析了国内外关于邻近链路系统的文献,确定出邻近链路系统的整个组成结构,并给出了系统指标。
According to the designing requirement of hf channel characteristics and combining with the 3rd generation ale ( 3g - ale ) technology , this paper proposes a new hf link protocol , using tdma mode . and this new protocol supports communication in large scale area . this protocol work in synchronization 本文结合第三代短波自组织网链路建立( 3g - ale ) [ 1 ]技术和短波信道特点提出了一种适用于节点大范围地理分布、全网同步工作和采用tdma工作模式的短波自组织网链路层协议。
According to the principle of this new link protocol , the scheme is simulated in opnet simulation . a whole network model using dsr route protocol and this new link protocol is found . several scenarios are designed to validate the feasibility of this link protocol under the vary load and the vary node mobile speed 本文最后根据提出的链路层协议原理,利用opnet网络仿真工具实现了该短波链路层协议模块,并在此基础上使用dsr路由协议模块搭建了整个节点模型和网络模型,最后模拟了多个不同的仿真场景,给出了在不同负载及不同节点移动速度下协议及网络性能变化情况。
The floodgate ' s opening measuring apparatus whose core is a plc , belongs to the field level and is used to implement the data collection of floodgates , calculation , communication , etc . these plcs are linked one another by the rs - 485 network . the communication between computer and plc adopts the computer link protocol . the paper introduces in detail the setting of communication parameters , the basic format of data transfer and the method to perform communication using the computer link protocol 以plc为核心的闸门开度测量仪为现地级，完成闸门的数据采集、运算和通信等功能，各pic之间用rs - 485网连接，计算机与plc的通信采用三菱公司的计算机链接通信协议，论文详细介绍了计算机链接协议的通信参数设置、数据传输的基本格式和实现通信的方法。
At the beginning , this paper has some brief dissertation on the basic principle of the dsl and the multimedia data compression , the key technique of sdsl , the transport protocols , and the data transfer system structure based on the twisted - pair . then it gives an analysis of the point - to - point data link protocol ( ppp ) and the real - time transmission protocol in detail , which provide the side - to - side transmission service for audio frequency and video frequency data , and so on based on the these , we developed a multimedia sdsl modem system used to transfer data and phonetic 本文首先对dsl系统和多媒体数据压缩技术的基本原理、 sdsl的关键技术、传输协议以及基于双绞线的数据传输系统的结构进行了简要的论述，并详细分析了点到点的数据链路协议( ppp协议)以及实时传输协议，其为音频、视频等实时数据提供端到端的传送服务。可以向接收端传送恢复实时信号必需的定时和顺序信息，并向收发双方和网络运营者提供qos监测手段。
The protocol opnet models built here could be reused for the simulation of throughput performance of aos bitstream , virtual channel access and other services , for the simulation of delay , channel utilization , and other aos protocol performance metrics , or for the simulation of the performances of high layer protocols ( space network layer , transport layer ) based on the aos space data link protocol 可以在本课题建立的协议opnet模型基础上进行aos协议位流、虚拟信道接入等其它业务吞吐量性能仿真,或进行延迟、信道利用率等协议其它性能仿真,或将模型应用于基于aos数据链路层的高层协议(空间网络层、传输层)性能仿真。
The topic mainly includes : data transmission between the ground station and satellite ; forecast and calculation of doppler frequency offset and adding it to modulation and demodulation as well as realization of all types of satellite communication protocols based on ax . 25 link protocol 本课题主要包括了地面站与卫星之间的数据传输，多普勒频移的预测、计算和加入调制解调，以及利用工控机技术完成以ax . 25链路层协议为底层的各种上层卫星通信协议的实现等几个方面的设计与编程实现。
