6    _______________________________________

     ... 15S
2.3.5.  ........................................................................................ 16:

........................................................................................................................... 16;

2.4.  .................................................................................................. 16''

2.4.1.  ...................................................................................... 16i

    

......................................................................... 161

     ................. 16!

     ............................. 17(

     

 FDM, TDM  WDM.................................................... 17:

2.4.2.   ...................................................................................... 17:

  ......................................................... 17:

      ................ 17-

     ............ 17i

2.4.3.  ................................................................................ 17'

 ........................................................................................................................... 17!

   .................................................................................................... 17!

 3     ...................................... 18

3.1.     ......................................................... 18

3.1.1.      ....................... 18

3.1.2.   IEEE 802.X ............................................................ 18-

 ........................................................................................................................... 18'

3.2.  LLC     (802.2) ............. 18!

3.2.1     LLC.................................................................. 18!

3.2.2.   LLC.   

 LLC2...................................................................................................... 18!

 ........................................................................................................................... 19:

3.3.  Ethernet (802.3) ................................................................................... 19;

3.3.1.   CSMA/CD........................................................................... 19:

   ............................................................................ 19'

  ...................................................................... 19i

     .................. 19"

3.3.2.    Ethernet............................. 19!

3.3.3.    Ethernet.................................................... 20:

 802.3/LLC......................................................................................... 20:

 Raw 802.3/Novell 802.3................................................................ 20-

 Ethernet DIX/Ethernet II........................................................... 20-

 Ethernet SNAP................................................................................ 20;

    Ethernet...................... 20',

3.3.4.    Ethernet......................................... 20(

 lOBase-5.................................................................................... 20'

 lOBase-2.................................................................................... 20!

 lOBase-T................................................................................... 21

 Ethernet.................................................................... 21'