DATA FORMAT The Link Layer has only one packet format used for both advertising channel packets and data channel packets链接层不管广播通道还是数据通道,都公用一种包格式参数: 1.Preamble 2.Access Address 3.PDU PDU分两种,一种是广播信道的PDU,一种是DATA信道的PDU 1)广播信道PDU: 2)DATA信道PDU DATA PDU也分两种…

一.LINK LAYER STATES 二.PHYSICAL CHANNEL…

BLE有几种空中包格式?常见的PDU命令有哪些?PDU和MTU的区别是什么?DLE又是什么?BLE怎么实现重传的?BLE ACK机制原理是什么?希望这篇文章能帮你回答以上问题. 虽然BLE空中包(packet)涉及BLE协议栈link layer,L2CAP,SMP和ATT等各层次,但link layer跟空中包格式关系最紧密,掌握了BLE packet的格式,就很容易理解BLE link layer协议的工作原理,因此文章取名"详解BLE空中包格式-兼BLE link layer协议解析&qu…

Week5 Now, I want to make it real clear that, when I give you a 15 minute video of an amazing inventor and computer scientist, you don't have to remember every word that that person says. Okay? it's more important to get the gist of it. I try to cove…

Week5 The Transport layer is built on the Internetwork layer and is what makes our network connections reliable. Technology: Internets and Packets 新年好!(￣▽￣) coursera address Layer1: Link Keywords: Packet, Shared Network, Layered Network Model, Link L…

Week5 Technology: Internets and Packets Welcome to Week 5! This week, we’ll be covering internets and packets. The Internet is designed based on a four-layer model. Each layer builds on the layers below it. The Link and Internetwork layers are the lo…

http://www.tcpdump.org/linktypes.html Link-layer header type values LINKTYPE_ name LINKTYPE_ value Corresponding DLT_ name Description LINKTYPE_NULL 0 DLT_NULL BSD loopback encapsulation; the link layer header is a 4-byte field, in host byte order, c…

http://stackoverflow.com/questions/13333794/networking-difference-between-transport-layer-and-networking-layer Transport Layer: The fourth and “middle” layer of the OSI Reference Model protocol stack is the transport layer. I consider the transport l…

Technology:Internets and Packets course Layer 1 : Link Introduction/The Link Layer moving from history to technology.怎么说,其实前几周看history我并不怎么感冒,可能对历史没有太大的兴趣.老师要开始讲解TCP/IP的体系结构了,有点小紧张,因为当初数据通讯与计算机网络学得并不好,让我有点小慌. Shared Network 这是一种存储转发的网络.与Store and For…

简述 有线通信,是用电缆直接连接.然后分距离的长短.有些会须要载入波,信号也可能会经过不同的调制方式调制. 无线通信也是一样,仅仅是信号的传输是通过射频了,通过在某一频段.对无线信道进行调制,将数据发送出去. BLE物理信道 在Physical Layer部分提到过BLE的物理信道,一共40个,在2.4GHz的ISM频段.事实上BLE的这40个物理信道是分成了两组的.一组是Advertising信道(3个).一组是Data信道(37个),详细情况例如以下: 在连接成功建立之前.设备之间是通过Ad…