在高度可靠的信道上(比如光纤)使用检错码(error-detecting code),这种策略包含少量的冗余信息可以让接收方推断出是否发生了错误(而推断不出哪个发生了错误),当偶尔发生错误时只需重传错误的数据帧;在错误发生很频繁的信道上(比如无线链路)使用纠错码(error-correcting code),这种策略包含包含足够多的冗余信息,以便接收...
Physical layer coding violations(物理层编码违例法) 适用于物理介质上的编码方法中包含冗余信息的网络,LAN中用两个物理位来编码1位数据,通常1位是高-低电平对,0是低-高电平对,每一位数据位都有一个中间电平的越变,这使得接受方容易定位到边界上。 Error Control(错误控制) 修复受到的错误的帧 要求接受方可以...
As a result, more powerful codes are needed to provide improved error resilience against multi-bit errors.doi:10.1007/978-1-4614-0962-5_3Qiaoyan YuPaul AmpaduSpringer New YorkAdaptive Error Control Coding at Datalink Layer. Q.Yu,P.Ampadu. Transient and Permanent Error Control for Networks-on...
Logical Link Control:It deals with protocols, flow-control, and error control Media Access Control:It deals with actual control of media Functionality of Data-link Layer Data link layer does many tasks on behalf of upper layer. These are: Framing Data-link layer takes packets from Network Layer...
The LLC sublayer provides the logic for the data link, thus it controls the synchronization, flow control, and error checking functions of the Data Link layer. This layer can handle connection-oriented transmissions (unlike the MAC sublayer below it), although connectionless service can also be ...
Flow&Error Control 流量控制和差错校验的组合: 流量控制:调节Tx与Rx之间数据通信速率,根据信道状况实现传输。实现方式Ack(及时响应数据报文)。当传输速率过快,Rx的BUFFER已经满了,无法继续消化传输的数据时,会返回一个响应数据包告诉Tx发慢点或者先别发,当接收能力改善后,则再返回一个数据包要求Tx调整速率或开始发。
差错纠正(Error correction) 半双工和全双工(Half-duplex and full-duplex) 链路层的实现 网络适配器与其他主机组件以及网络协议栈的关系 数据链路层的实现是:硬件 + 软件 大部分功能在硬件(网卡)中实现:framing, link access, flow control, err dectection 等等 ...
Invalid Characters(在L1的return-to-zero可以应用): 效率高但是和layer model不符合。 2. Error Detection and Correction Bit Error: 单个比特篡改 Burst Error: 一系列比特篡改 Error原因:热噪音、干扰之类的->通常导致burst error Error detection: 插入冗余来侦测错误、如果遇到错误那就重传 ...
Port Control Manager remote error Explanation: A primitive was processed and an error was found by the remote node; for example, the local ATM switch experienced a failure. X'1C' Service-specific component local error Explanation: A primitive was processed and an error was found by a servi...
its flow control, error detection, and security. We also describe how to maintain slot synchronization with TDMA, schedule slots to listen for packets from neighbors and propagate packets from the network layer. Please refer to the TDMA Data Link Layer Specification (HCF_SPEC-75) for more ...