��1��  �W(w��ng)�j�wϵ�Y(ji��)��(g��u)(network architecture)  1.1  ��Ϣ��ݔ��λ(information transfer unit)    1.1.1  ��Ϣ����(sh��)��(j��)����̖(information,data and signal)    1.1.2  �aԪ�ͱ���(symbol and bit)    1.1.3  ������(sh��)��(j��)�󡢈��Ķκ͈���(frame,datagram,segment and message)    1.1.4  �ŵ�����Դ�c����(information channel,source and destination)  1.2  �W(w��ng)�j�ͅf(xi��)�h(network and protocol)    1.2.1  �W(w��ng)�j���x(definition of network)    1.2.2  �W(w��ng)�j�f(xi��)�h(protocol)    1.2.3  �f(xi��)�h��(sh��)��(j��)��Ԫ(protocol data unit)  1.3  osi�W(w��ng)�j�wϵ�Y(ji��)��(g��u)(osi architecture)    1.3.1  osi����ģ�͵��ƶ�(design osi reference model)    1.3.2  osi���ӵ���Ҫ����(functions of all osi layers)  1.4  tcp/ip�W(w��ng)�j�wϵ�Y(ji��)��(g��u)(tcp/ip architecture)  1.5  �F(xi��n)�������W(w��ng)�j(field bus)    1.5.1  �������x�����(bus definition and classes)    1.5.2  �F(xi��n)���������x�ͷ��(definition and classes of field bus)    1.5.3  �F(xi��n)�������Ĺ��ܺ��wϵ�Y(ji��)��(g��u)(function and architecture of field bus)  1.6  �W(w��ng)�j����vʷ�Ͱl(f��)չ(networks classes,history and future development)    1.6.1  �W(w��ng)�j���(networks classes)    1.6.2  �ֽM���Q�Įa(ch��n)��(packet switching)    1.6.3  Ӌ��C�W(w��ng)�j�İl(f��)չ(development of computer network)  ���}1  ���ָ��1-1���þW(w��ng)�j�{(di��o)ԇ����  ���ָ��1-2�J�R�W(w��ng)�j�wϵ�Y(ji��)��(g��u)���f(xi��)�h��2��  �����(physical layer)  2.1  ��̖(signal)    2.1.1  �о����̖(wire signal)    2.1.2  ���w��̖��ݔ(optical fiber signal)    2.1.3  �o����̖(wireless signal)  2.2  ��ݔ���|(zh��)(transfer media)    2.2.1  �p�g��(twist pair)    2.2.2  ͬ�S��|(coaxial cable)    2.2.3  ���|(optical cable)    2.2.4  �o��ͨ��(wireless communication)  2.3  ���a���g(encoding technology)    2.3.1  �l�����a(frequency band encoding)    2.3.2  �������a(baseband encoding)    2.3.3  4b/5b��8b/10b���a(4b/5b and 8b/10b encoding)  2.4  �ŵ�����(multiplex channel)    2.4.1  �r�ֶ�·����tdma(time division multiplex access)    2.4.2  �l�ֶ�·����fdma(frequency division multiplex access)    2.4.3  �a�ֶ�·����cdma(code division multiplex access)  2.5  ��Ϣ��ݔ����ָ��(transfer ratio)    2.5.1  ����������(bandwidth and rate)    2.5.2  ���϶���(nyquist formula)    2.5.3  ���r(n��ng)��ʽ(claude e. shannon equation)    2.5.4  �����c�����~����(bandwidth and fourier analysis)  2.6  ����ӳ��ؘ�(physical layer standards)    2.6.1  ��̖��ݔ���(signal transmission classes)    2.6.2  ���Ђ�ݔ���g(serial transmission)    2.6.3  eia rs232�ӿژ˜�(rs232 interface standard)    2.6.4  eia rs485�ӿژ˜�(rs485 interface standard)    2.6.5  usb������늚�����(usb bus electrical characteristics)    2.6.6  can������늚�����(can bus electrical characteristics)  2.7  ��̫�W(w��ng)�������(physical layer of ethernet)    2.7.1  802.3����W(w��ng)�Ď׷N��ݔý�w(transmission media of 802.3 lan)    2.7.2  ��̫�W(w��ng)���a����(ethernet coding way)    2.7.3  802.11  �o����ݔ�����(physical layer)  2.8  modem��xdsl(modem and x digital subscriber line)    2.8.1  xdsl���gԭ��(xdsl tech principle)    2.8.2  ���Qdsl���g(symmetrical dsl tech)��3��  ��(sh��)��(j��)�·��(data link layer)��4��  �W(w��ng)�j��(network layer)��5��  ��ݔ��(transmission layer)��6��  ���ܰ�ȫ(encryption & security)��7��  ���Ì�(application layer)��8��  Ƕ�롢�ƄӺ���“(li��n)�W(w��ng)(embedded,mobile & iot)��䛅����īI